Patent US3705534A successfully refreshed from Google Patents.
US3705534A
Expired / Lapsed
US
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Fluidic flow sensing method and apparatus
Assignee: Bowles Fluidics Corp
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Filing: 1970-05-12
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Granted: 1972-12-12
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Expires: 1990-05-12
Abstract
Abstract Fluidic flow sensing techniques are disclosed which permit sensitive flow measurements over a wider range of flow rates than was heretofore possible. In one embodiment a jet of working fluid, directed parallel to the sensed flow, is modulated by viscous interaction with the sensed flow, thereby changing the downstream dynamic pressure of the jet as a function of the sensed flow. In a second embodiment a jet of working fluid is directed angularly with respect to the sensed flow, producing jet deflection which is monitored as a differential pressure across a pair of downstream receivers. A negative feedback circuit, including a high gain amplifier fed by the differential pressure, controls the jet supply pressure to maintain a differential pressure null across the receivers, thereby rendering the jet supply pressure a function of the sensed flow.
Inventors
- 👤 Robert F Turek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:09
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/20; G01F1/203; Y; Y10; Y10T; Y10T137/00; Y10T137/206; Y10T137/2065; Y10T137/2071
Claims Analysis
Total Claims: 54
Claim 1
Independent Claim
140 words
A fluidic sensor for monitoring the flow of a fluid stream over a predetermined range of flows, said sensor comprising: first means responsive to application of pressurized fluid thereto for issuing a power jet of fluid into interaction with said fluid stream such that flow of said jet is varied by flow variations of said fluid stream; receiver means disposed for receiving fluid from said jet and located relative to said first means such that the pressure of said power jet at said receiver means varies with flow variations of said fluid stream over the range of flows to be sensed; and feedback means responsive to jet fluid received by said receiver means for applying pressurized fluid to said first means at a pressure which is a predetermined function of the pressure of jet fluid received by said receiver means.
Claim 2
Dependent Claim
140 words
A fluidic sensor for monitoring the flow of a fluid stream over a predetermined range of flows, said sensor comprising: first means responsive to application of pressurized fluid thereto for issuing a power jet of fluid into interaction with said fluid stream such that flow of said jet is varied by flow variations of said fluid stream; receiver means disposed for receiving fluid from said jet and located relative to said first means such that the pressure of said power jet at said receiver means varies with flow variations of said fluid stream over the range of flows to be sensed; and feedback means responsive to jet fluid received by said receiver means for applying pressurized fluid to said first means at a pressure which is a predetermined function of the pressure of jet fluid received by said receiver means.
Claim 3
Dependent Claim
34 words
The sensor according to claim 1 wherein said power jet is issued from a nozzle disposed within said fluid stream and having a longitudinal axis extending in a direction parallel to said fluId stream.
Claim 4
Dependent Claim
21 words
The sensor according to claim 1 wherein said power jet is issued in a direction generally perpendicular to said fluid stream.
Claim 5
Dependent Claim
130 words
A sensor for monitoring flow of a fluid stream, comprising: nozzle means responsive to application of variable pressure supply fluid thereto for issuing a variable pressure power jet of supply fluid into said fluid stream such that a predetermined component of flow of said power jet is varied in response to variations in said fluid stream flow; means for applying supply fluid to said nozzle means; receiver means disposed for receiving power jet fluid at a pressure which tends to vary with variations in said fluid stream flow; and feedback means for maintaining substantially constant the pressure of jet fluid received by said receiver means, said feedback means including means responsive to fluid received by said receiver means for varying the pressure of supply fluid applied to said nozzle means.
Claim 6
Dependent Claim
130 words
A sensor for monitoring flow of a fluid stream, comprising: nozzle means responsive to application of variable pressure supply fluid thereto for issuing a variable pressure power jet of supply fluid into said fluid stream such that a predetermined component of flow of said power jet is varied in response to variations in said fluid stream flow; means for applying supply fluid to said nozzle means; receiver means disposed for receiving power jet fluid at a pressure which tends to vary with variations in said fluid stream flow; and feedback means for maintaining substantially constant the pressure of jet fluid received by said receiver means, said feedback means including means responsive to fluid received by said receiver means for varying the pressure of supply fluid applied to said nozzle means.
Claim 7
Dependent Claim
26 words
The sensor according to claim 4 wherein said predetermined flow component of said power jet is directed parallel to the flow direction of said fluid stream.
Claim 8
Dependent Claim
27 words
The sensor according to claim 4 wherein said predetermined flow component of said power jet is directed substantially perpendicular to the flow direction of said fluid stream.
Claim 9
Dependent Claim
114 words
A fluidic sensor for monitoring the flow of a fluid stream over a predetermined range of flows, said sensor comprising: a nozzle arranged to be disposed in a fluid stream and responsive to pressurized fluid applied thereto for issuing a power jet of fluid within said fluid stream and parallel to the flow direction of said fluid stream; receiver means arranged to be disposed in said fluid stream for receiving a portion of said power jet and located relative to said nozzle such as to receive a portion of said power jet the dynamic pressure of which varies as a function of the flow of said fluid stream over a predetermined range of flows.
Claim 10
Dependent Claim
114 words
A fluidic sensor for monitoring the flow of a fluid stream over a predetermined range of flows, said sensor comprising: a nozzle arranged to be disposed in a fluid stream and responsive to pressurized fluid applied thereto for issuing a power jet of fluid within said fluid stream and parallel to the flow direction of said fluid stream; receiver means arranged to be disposed in said fluid stream for receiving a portion of said power jet and located relative to said nozzle such as to receive a portion of said power jet the dynamic pressure of which varies as a function of the flow of said fluid stream over a predetermined range of flows.
Claim 11
Dependent Claim
122 words
A fluidic sensor for monitoring a predetermined flow component of a fluid stream, said sensor comprising: means for issuing a power jet of fluid from a location within and in a direction parallel to said predetermined flow component and in interacting relationship with said fluid stream such that at least a portion of said power jet is viscously coupled to said fluid stream and experiences velocity variations as a function of variations in said predetermined flow component of said fluid stream; and output means for receiving said portion of said power jet and located relative to said means for issuing such as to receive a portion of said power jet which varies as a function of the velocity of said fluid stream.
Claim 12
Dependent Claim
122 words
A fluidic sensor for monitoring a predetermined flow component of a fluid stream, said sensor comprising: means for issuing a power jet of fluid from a location within and in a direction parallel to said predetermined flow component and in interacting relationship with said fluid stream such that at least a portion of said power jet is viscously coupled to said fluid stream and experiences velocity variations as a function of variations in said predetermined flow component of said fluid stream; and output means for receiving said portion of said power jet and located relative to said means for issuing such as to receive a portion of said power jet which varies as a function of the velocity of said fluid stream.
Claim 13
Dependent Claim
36 words
The fluidic sensor according to claim 8 wherein said means for issuing comprises a nozzle disposed within said fluid stream and having a longitudinal axis extending parallel to the direction of flow of said fluid stream.
Claim 14
Dependent Claim
27 words
The sensor according to claim 9 wherein said output means comprises a receiver tube having an ingress opening which is coaxially aligned relative to said power jet.
Claim 15
Dependent Claim
27 words
The sensor according to claim 9 wherein said output means comprises a receiver tube having an ingress opening which is coaxially misaligned relative to said power jet.
Claim 16
Dependent Claim
62 words
The sensor according to claim 9 wherein said output means comprises a first receiver tube having an ingress opening which is coaxially aligned relative to said power jet and a second receiver tube having an ingress opening concentrically disposed about the ingress opening of said first receiver tube, wherein said fluid pressure in said second receiver tube corresponds to said output pressure.
Claim 17
Dependent Claim
100 words
The sensor according to claim 9 further comprising: means for issuing a second power jet of fluid in a direction opposite to the direction of said first-mentioned power jet and in interacting relationship with said fluid stream such that at least a portion of said second power jet experiences velocity variations as a function of variationS in said predetermined component of said fluid stream; and further output means for receiving said portion of said second power jet and for providing a second output pressure which varies as a function of the velocity of said portion of said second power jet.
Claim 18
Dependent Claim
70 words
The sensor according to claim 13 wherein said portion of said first-mentioned power jet and said portion of said second power jet experience substantially equal and opposite velocity variations in response to variations in said predetermined flow component of said fluid stream, whereby the pressure difference between said first mentioned output pressure and said second output pressure is a linear function of said predetermined flow component of said fluid stream.
Claim 19
Dependent Claim
76 words
The sensor according to claim 9 further comprising means for isolating said predetermined flow component of said fluid stream comprising a hollow cylindrical member disposed in said fluid stream about said power jet and said output means with the longitudinal axis of said cylindrical member extending parallel to said predetermined flow component of said fluid stream, said cylindrical member having flow straightening means disposed at both ends thereof for minimizing flow distortion through said cylindrical member.
Claim 20
Dependent Claim
46 words
The sensor according to claim 15 wherein the inner wall of said cylindrical member is configured to form a venturi flow section with said power jet disposed therein, whereby said predetermined flow component of said fluid stream is augmented in the region of said power jet.
Claim 21
Dependent Claim
46 words
The sensor according to claim 9 wherein said output means includes feedback means for maintaining the pressure of received power jet fluid substantially constant, said feedback means including means responsive to received power jet fluid for varying the pressure at which said power jet is issued.
Claim 22
Dependent Claim
40 words
The fluidic sensor according to claim 8 wherein said power jet includes a central core of substantially constant pressure and velocity, and wherein said receiver means is disposed to receive said portion of said power jet outside said central core.
Claim 23
Dependent Claim
56 words
The sensor according to claim 9 further comprising means for isolating said predetermined flow component of said fluid stream comprising a hollow cylindrical member disposed in said fluid stream about said power jet and said output means with the longitudinal axis of said cylindrical member extending parallel to said predetermined flow component of said fluid stream.
Claim 24
Dependent Claim
125 words
A fluidic sensor for monitoring flow of a fluid stream comprising: a power nozzle responsive to application of pressurized fluid thereto for issuing a power jet of fluid into interacting relationship with said fluid stream and generally perpendicular to said fluid stream; receiver means for providing a differential pressure as a function of deflection of said power jet by said fluid stream; and feedback means responsive to said differential pressure for varying the pressure of fluid applied to said power nozzle as a function of said differential pressure to maintain said power jet deflected to a position in which said differential pressure is nulled, whereby the pressure of the fluid applied to said power nozzle is a measure of the flow of said fluid stream.
Claim 25
Dependent Claim
125 words
A fluidic sensor for monitoring flow of a fluid stream comprising: a power nozzle responsive to application of pressurized fluid thereto for issuing a power jet of fluid into interacting relationship with said fluid stream and generally perpendicular to said fluid stream; receiver means for providing a differential pressure as a function of deflection of said power jet by said fluid stream; and feedback means responsive to said differential pressure for varying the pressure of fluid applied to said power nozzle as a function of said differential pressure to maintain said power jet deflected to a position in which said differential pressure is nulled, whereby the pressure of the fluid applied to said power nozzle is a measure of the flow of said fluid stream.
Claim 26
Dependent Claim
137 words
A fluidic sensor for monitoring a predetermined flow component of a fluid stream, said sensor comprising: means for issuing a power jet of fluid having a jet flow component directed perpendicular to said predetermined flow component and in interacting relationship with said fluid stream; first and second receiver tubes disposed in receiving relationship to said power jet and co-planar with said predetermined flow component, said receiver tubes being disposed such that a differential pressure appears thereacross as a function of deflection of said power jet; negative feedback means including a high gain amplifier and responsive to said differential pressure for varying the dynamic pressure of said power jet as necessary to maintain said dIfferential pressure substantially constant, whereby the dynamic pressure of said power stream is a measure of said predetermined flow component of said fluid stream.
Claim 27
Dependent Claim
137 words
A fluidic sensor for monitoring a predetermined flow component of a fluid stream, said sensor comprising: means for issuing a power jet of fluid having a jet flow component directed perpendicular to said predetermined flow component and in interacting relationship with said fluid stream; first and second receiver tubes disposed in receiving relationship to said power jet and co-planar with said predetermined flow component, said receiver tubes being disposed such that a differential pressure appears thereacross as a function of deflection of said power jet; negative feedback means including a high gain amplifier and responsive to said differential pressure for varying the dynamic pressure of said power jet as necessary to maintain said dIfferential pressure substantially constant, whereby the dynamic pressure of said power stream is a measure of said predetermined flow component of said fluid stream.
Claim 28
Dependent Claim
25 words
The sensor according to claim 21 wherein said first and second receiver tubes are asymmetrically disposed relative to the undeflected position of said power jet.
Claim 29
Dependent Claim
47 words
The sensor according to claim 22 wherein said first sensor tube is disposed to receive said power jet when undeflected and said second receiver tube is disposed to receive said power jet when deflected in a first sense by said predetermined flow component of said fluid stream.
Claim 30
Dependent Claim
99 words
The sensor according to claim 23 further comprising: a third receiver tube disposed to receive said power jet when deflected in a second sense opposite said first sense by said predetermined flow component of said fluid stream, said second and third receiver tubes being symmetrically disposed relative to the undeflected position of said power jet; nd means for combining power jet fluid received by said second and third receiver tubes such that said differential pressure is the pressure difference between fluid received by said first receiver tube and the combined fluid received by said second and third receiver tubes.
Claim 31
Dependent Claim
83 words
The sensor according to claim 21 further comprising means for isolating said predetermined flow component of said fluid stream comprising a hollow cylindrical member disposed in said fluid stream about said power jet and the ingress ends of said receiver tubes with the longitudinal axis of said cylindrical member extending parallel to said predetermined flow component of said fluid stream, said cylindrical member having flow straightening means disposed at both ends thereof for minimizing distortion of fluid stream flow through said cylindrical member.
Claim 32
Dependent Claim
35 words
The sensor according to claim 25 wherein the inner wall of said cylindrical member is configured to form a venturi flow section for augmenting said predetermined flow component in the region of said power jet.
Claim 33
Dependent Claim
98 words
A fluidic sensor for monitoring a predetermined flow component of a fluid stream, said sensor comprising: means for issuing two parallel and coaxial power jets of fluid in a direction parallel to said predetermined flow component and in interaction relationship with said fluid stream such that at least a portion of each of said power jets experiences velocity variations as a function of variations in said predetermined flow component of said fluid stream; and output means for monitoring the relative velocity variations imparted to said portions of said jets by said predetermined flow component of said fluid stream.
Claim 34
Dependent Claim
98 words
A fluidic sensor for monitoring a predetermined flow component of a fluid stream, said sensor comprising: means for issuing two parallel and coaxial power jets of fluid in a direction parallel to said predetermined flow component and in interaction relationship with said fluid stream such that at least a portion of each of said power jets experiences velocity variations as a function of variations in said predetermined flow component of said fluid stream; and output means for monitoring the relative velocity variations imparted to said portions of said jets by said predetermined flow component of said fluid stream.
Claim 35
Dependent Claim
74 words
The fluidic sensor according to claim 27 wherein said power jets are issued in impacting relation to create a resultant stream of fluid emanating from the point at which said jets impact and having a flow component directed transversely of said fluid stream, whereby the impact point of said jets varies with the flow of said fluid stream and said resultant stream is deflected as a function of the flow of said fluid stream.
Claim 36
Dependent Claim
152 words
A two-axis fluidic flow sensor for monitoring the flow of a fluid stream in a predetermined plane, said sensor comprising: means for issuing a power jet of fluid through said fluid stream and perpendicular to said predetermined plane; first receiver means for providing a first differential pressure signal as a function of deflection of said power jet by said fluid stream in one plane perpendicular to said predetermined plane; second receiver means for providing a second differential pressure as a function of deflection of said power jet by said fluid stream in a second plane perpendicular to both said predetermined plane and said one plane; control means responsive to said second differential pressure for rotating said first and second receiver means about an axis parallel to said power jet whenever said second differential pressure differs from a specified pressure and until deflecTion of said power jet is wholly within said one plane.
Claim 37
Dependent Claim
152 words
A two-axis fluidic flow sensor for monitoring the flow of a fluid stream in a predetermined plane, said sensor comprising: means for issuing a power jet of fluid through said fluid stream and perpendicular to said predetermined plane; first receiver means for providing a first differential pressure signal as a function of deflection of said power jet by said fluid stream in one plane perpendicular to said predetermined plane; second receiver means for providing a second differential pressure as a function of deflection of said power jet by said fluid stream in a second plane perpendicular to both said predetermined plane and said one plane; control means responsive to said second differential pressure for rotating said first and second receiver means about an axis parallel to said power jet whenever said second differential pressure differs from a specified pressure and until deflecTion of said power jet is wholly within said one plane.
Claim 38
Dependent Claim
21 words
The sensor according to claim 29 further comprising means for indicating the angular position of said first and second receiver means.
Claim 39
Dependent Claim
126 words
A fluidic circuit responsive to fluid input signals, said circuit comprising: a power nozzle responsive to application of pressurized fluid thereto for issuing a power jet of fluid; means responsive to said fluid input signal for deflecting said power jet as a function of said input signal; receiver means for providing a pressure signal as a function of deflection of said power jet; and feedback means responsive to said pressure signal for varying the pressure of fluid applied to said power nozzle as a function of said pressure signal to maintain said power jet deflected to a position in which said pressure signal is a predetermined pressure, whereby the pressure of the fluid applied to said power nozzle is a measure of said fluid input signal.
Claim 40
Dependent Claim
126 words
A fluidic circuit responsive to fluid input signals, said circuit comprising: a power nozzle responsive to application of pressurized fluid thereto for issuing a power jet of fluid; means responsive to said fluid input signal for deflecting said power jet as a function of said input signal; receiver means for providing a pressure signal as a function of deflection of said power jet; and feedback means responsive to said pressure signal for varying the pressure of fluid applied to said power nozzle as a function of said pressure signal to maintain said power jet deflected to a position in which said pressure signal is a predetermined pressure, whereby the pressure of the fluid applied to said power nozzle is a measure of said fluid input signal.
Claim 41
Dependent Claim
116 words
A fluidic sensor for monitoring a predetermined flow parameter in a system, said sensor comprising: means for issuing a power jet of fluid; means for applying a deflecting force against said power jet as a function of said parameter; first and second receiver tubes disposed in receiving relationship to said power jet and disposed such that a differential pressure appears across said receiver tubes as a function of deflection of said power jet; negative feedback means, including a high gain amplifier, responsive to said differential pressure for varying the dynamic pressure of said power jet to maintain said differential pressure substantially constant, whereby the dynamic pressure of said power stream is a measure of said parameter.
Claim 42
Dependent Claim
116 words
A fluidic sensor for monitoring a predetermined flow parameter in a system, said sensor comprising: means for issuing a power jet of fluid; means for applying a deflecting force against said power jet as a function of said parameter; first and second receiver tubes disposed in receiving relationship to said power jet and disposed such that a differential pressure appears across said receiver tubes as a function of deflection of said power jet; negative feedback means, including a high gain amplifier, responsive to said differential pressure for varying the dynamic pressure of said power jet to maintain said differential pressure substantially constant, whereby the dynamic pressure of said power stream is a measure of said parameter.
Claim 43
Dependent Claim
104 words
A fluidic sensor for monitoring velocity of a fluid stream comprising: a power nozzle responsive to application of pressurized fluid thereto for issuing a power jet of fluid into interacting relationship with said fluid stream and generally perpendicular to said fluid stream; receiver means for providing a differential pressure as a function of deflection of said power jet by said fluid stream; and feedback means responsive to said differential pressure for opposing deflection of said power jet by said fluid stream as a function of said differential pressure to maintain said power jet deflected to a position in which said differential pressure is constant.
Claim 44
Dependent Claim
104 words
A fluidic sensor for monitoring velocity of a fluid stream comprising: a power nozzle responsive to application of pressurized fluid thereto for issuing a power jet of fluid into interacting relationship with said fluid stream and generally perpendicular to said fluid stream; receiver means for providing a differential pressure as a function of deflection of said power jet by said fluid stream; and feedback means responsive to said differential pressure for opposing deflection of said power jet by said fluid stream as a function of said differential pressure to maintain said power jet deflected to a position in which said differential pressure is constant.
Claim 45
Dependent Claim
101 words
A fluidic sensor for monitoring a predetermined flow parameter in a system, said sensor comprising: means for issuing a power jet of fluid; means for applying a deflecting force against said power jet as a function of said parameter; first and second receiver tubes disposed in receiving relationship to said power jet and disposed such that a differential pressure appears across said receiver tubes as a function of deflection of said power jet; negative feedback means, including a high gain amplifier, responsive to said differential pressure for varying the deflection of said power jet to maintain said differential pressure substantially constant.
Claim 46
Dependent Claim
101 words
A fluidic sensor for monitoring a predetermined flow parameter in a system, said sensor comprising: means for issuing a power jet of fluid; means for applying a deflecting force against said power jet as a function of said parameter; first and second receiver tubes disposed in receiving relationship to said power jet and disposed such that a differential pressure appears across said receiver tubes as a function of deflection of said power jet; negative feedback means, including a high gain amplifier, responsive to said differential pressure for varying the deflection of said power jet to maintain said differential pressure substantially constant.
Claim 47
Dependent Claim
120 words
A fluidic element responsive to a fluid input signal, comprising: first means responsive to application of pressurized fluid thereto for issuing a power jet of fluid into interaction with said fluid input signal such that flow of said power jet is varied by flow variations of said fluid input signal; receiver means disposed for receiving power jet fluid at a pressure which varies with flow variations of said fluid input signal; means for applying pressurized fluid to said first means; and feedback means for maintaining constant the pressure of jet fluid received by said receiver means, said feedback means including means responsive to fluid received by said receiver means for varying the pressure supply fluid applied to said first means.
Claim 48
Dependent Claim
120 words
A fluidic element responsive to a fluid input signal, comprising: first means responsive to application of pressurized fluid thereto for issuing a power jet of fluid into interaction with said fluid input signal such that flow of said power jet is varied by flow variations of said fluid input signal; receiver means disposed for receiving power jet fluid at a pressure which varies with flow variations of said fluid input signal; means for applying pressurized fluid to said first means; and feedback means for maintaining constant the pressure of jet fluid received by said receiver means, said feedback means including means responsive to fluid received by said receiver means for varying the pressure supply fluid applied to said first means.
Claim 49
Independent Claim
80 words
The method of monitoring the flow of a fluid stream comprising the steps of: issuing a power jet of fluid into viscous intEraction with said fluid stream from a location within said fluid stream and along an axis parallel to said flow of said fluid stream, said power jet having a central core of substantially constant pressure and velocity; and receiving said power jet at a location outside said core as a function of the velocity of said fluid stream.
Claim 50
Independent Claim
80 words
The method of monitoring the flow of a fluid stream comprising the steps of: issuing a power jet of fluid into viscous intEraction with said fluid stream from a location within said fluid stream and along an axis parallel to said flow of said fluid stream, said power jet having a central core of substantially constant pressure and velocity; and receiving said power jet at a location outside said core as a function of the velocity of said fluid stream.
Claim 51
Dependent Claim
146 words
A fluidic sensor for monitoring a parameter of a flowing stream of fluid, said parameter being variable over a predetermined range, said sensor comprising: means for issuing a power stream into said stream of fluid; a receiver disposed in said stream of fluid and positioned to receive said power stream; said receiver located such that the flow characteristic of said power stream received by said receiver is the same as the flow characteristic of the power stream issued by said means for issuing and further the pressure of the power stream received varies as a function of the flow parameter of the stream of fluid to be measured over said predetermined range; and feedback means responsive to the fluid received by said receiver for applying pressurized fluid to said means for issuing at a pressure which is a predetermined function of the pressure at said receiver.
Claim 52
Dependent Claim
146 words
A fluidic sensor for monitoring a parameter of a flowing stream of fluid, said parameter being variable over a predetermined range, said sensor comprising: means for issuing a power stream into said stream of fluid; a receiver disposed in said stream of fluid and positioned to receive said power stream; said receiver located such that the flow characteristic of said power stream received by said receiver is the same as the flow characteristic of the power stream issued by said means for issuing and further the pressure of the power stream received varies as a function of the flow parameter of the stream of fluid to be measured over said predetermined range; and feedback means responsive to the fluid received by said receiver for applying pressurized fluid to said means for issuing at a pressure which is a predetermined function of the pressure at said receiver.
Claim 53
Dependent Claim
140 words
A fluidic sensor for monitoring a parameter of a flowing stream of fluid, said parameter being variable over a predetermined range, said sensor comprising: means for issuing a power stream into said stream of fluid; a receiver disposed in said stream of fluid and positioned to receive said power stream; said receiver located such that the flow characteristic of said power stream received by said receiver is the same as the flow characteristic of the power stream issued by said means for issuing and further the pressure of the power stream varies as a function of the flow parameter of the stream of fluid to be measured over said predetermined range; said means for issuing and said receiver being adapted to be positioned in said stream of fluid such that the power stream flows parallel to said stream of fluid.
Claim 54
Dependent Claim
140 words
A fluidic sensor for monitoring a parameter of a flowing stream of fluid, said parameter being variable over a predetermined range, said sensor comprising: means for issuing a power stream into said stream of fluid; a receiver disposed in said stream of fluid and positioned to receive said power stream; said receiver located such that the flow characteristic of said power stream received by said receiver is the same as the flow characteristic of the power stream issued by said means for issuing and further the pressure of the power stream varies as a function of the flow parameter of the stream of fluid to be measured over said predetermined range; said means for issuing and said receiver being adapted to be positioned in said stream of fluid such that the power stream flows parallel to said stream of fluid.
References Cited (Backward Citations)
US2057645A
Cited
US2706409A
Cited
US3285263A
Cited
US3343413A
Cited
US3502092A
Cited
US3429323A
Cited
US3503410A
Cited
US3605778A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |