Patent US4390930A successfully refreshed from Google Patents.
Patent US4596153A successfully refreshed from Google Patents.
US4596153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vane for use in monitoring flow of a fluid
Assignee: BAE Systems Electronics Ltd
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Filing: 1983-12-19
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Granted: 1986-06-24
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Expires: 2003-12-19
Abstract
Abstract A flowmeter has a vane which is caused to vibrate at one of its resonant frequencies and a flexure standing wave set up along it. Two piezoelectric sensors are used to monitor characteristics of the standing wave and hence the mass flow rate of a fluid flowing past the vane along a pipe. The vane comprises a ceramic planar member on which a conductive ceramic ink is laid down to form tracks. The ink also bonds a ceramic piezoelectric transducer to the member to drive and maintain it in vibration. A non-conductive layer is laid down on the surface of the member covering the conductive tracks surrounding the transducer. A metal layer forms the external surface of the vane and acts as a ground plane for the transducer.
Inventors
- 👤 George A. Macdonald
- 👤 Charles R. Jarvis
- 👤 Roger M. Langdon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:57
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/76; G01F1/78; G01F1/66; G01F1/662
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
65 words
A vane for use in monitoring flow of a fluid comprising: a member capable of supporting a flexural vibration and composed of a firt ceramic material; a piezoelectric transducer composed of a second ceramic material that is different from said first ceramic material; and a third ceramic material positioned between the transducer and said member so as to bond the transducer firmly to the member.
Claim 2
Dependent Claim
65 words
A vane for use in monitoring flow of a fluid comprising: a member capable of supporting a flexural vibration and composed of a firt ceramic material; a piezoelectric transducer composed of a second ceramic material that is different from said first ceramic material; and a third ceramic material positioned between the transducer and said member so as to bond the transducer firmly to the member.
Claim 3
Dependent Claim
34 words
A vane as claimed in claim 1 and wherein at least a region of said third ceramic material is conductive, and is arranged to provide an electrical path to one face of said transducer.
Claim 4
Dependent Claim
33 words
A vane as claimed in claim 1 and wherein two piezoelectric transducers are provided for the purpose of monitoring the phase difference of the flexural vibration at two separate locations along the member.
Claim 5
Dependent Claim
30 words
A vane as claimed in claim 1 and wherein another piezoelectric transducer of the second ceramic material is mounted on said member to drive and maintain said member in vibration.
Claim 6
Dependent Claim
24 words
A vane as claimed in claim 1 and wherein a metal layer covers the ceramic materials and forms the external surface of the vane.
Claim 7
Dependent Claim
10 words
A flowmeter including a vane as claimed in claim 1.
Claim 8
Dependent Claim
170 words
A vane for use in monitoring flow of a fluid through a conduit, comprising: an elongated member disposed within said conduit and capable of supporting a flexural vibration, said elongated member being composed of an insulating ceramic material and having a first end and a second end; a piezoelectric transducer composed of a ceramic material having a composition different from that of said elongated member, said transducer having a length that is substantially less than the length of said elongated member; and a conductive element which is affixed to said elongated member and which is composed of a ceramic material having a composition different from that of said elongated member and that of said transducer, said conductive element having a bonding portion which is disposed between said elongated member and said transducer to bond said transducer to said elongated member, said conductive element additionally having an elongated track portion which is substantially longer than said length of said transducer and which extends toward said first end of said elongated member.
Claim 9
Dependent Claim
170 words
A vane for use in monitoring flow of a fluid through a conduit, comprising: an elongated member disposed within said conduit and capable of supporting a flexural vibration, said elongated member being composed of an insulating ceramic material and having a first end and a second end; a piezoelectric transducer composed of a ceramic material having a composition different from that of said elongated member, said transducer having a length that is substantially less than the length of said elongated member; and a conductive element which is affixed to said elongated member and which is composed of a ceramic material having a composition different from that of said elongated member and that of said transducer, said conductive element having a bonding portion which is disposed between said elongated member and said transducer to bond said transducer to said elongated member, said conductive element additionally having an elongated track portion which is substantially longer than said length of said transducer and which extends toward said first end of said elongated member.
Claim 10
Dependent Claim
100 words
The vane of claim 7, wherein said transducer is disposed adjacent said second end of said elongated member, and further comprising another piezoelectric transducer composed of a ceramic material and another conductive element which is affixed to said elongated member and which is composed of a ceramic material, said another conductive element having a bonding portion whih is disposed between said elongated member and said another transducer to bond said another transducer to said elongated member adjacent said first end thereof, said another conductive element additionally having a track portion which extends toward said first end of said elongated member.
Claim 11
Dependent Claim
92 words
The vane of claim 8, further comprising a further piezoelectric transducer composed of ceramic material and a further conductive element which is affixed to said elongated member and which is composed of a ceramic material, said further conductive element having a bonding portion which is disposed between said elongated member and said further transducer to bond said further transducer to said elongated member at a position between said transducer and said another transducer, said further conductive element additionally having a track portion which extends toward said first end of said elongated member.
Claim 12
Dependent Claim
33 words
The vane of claim 9, further comprising an insulating layer which is composed of a ceramic material, said insulating layer being affixed to said elongated member and covering at least said track portions.
Claim 13
Dependent Claim
36 words
The vane of claim 10, wherein portions of said transducers protrude through said insulating layer, and further comprising a metal coating deposited on said elongated member, said insulating layer, and the protruding portions of said transducers.
Claim 14
Dependent Claim
25 words
The vane of claim 11, wherein said metal coating has an inner region formed of evaporated metal and an outer region formed of plated metal.
Claim 15
Dependent Claim
23 words
The vane of claim 11, wherein said conduit has a support mounted therein, and wherein said metal coating is soldered to said support.
Claim 16
Dependent Claim
32 words
The vane of claim 7, further comprising an insulating layer which is composed of ceramic material, said insulating layer being affixed to said elongated member and covering at least said track portion.
Claim 17
Dependent Claim
37 words
The vane of claim 14, wherein a portion of said transducer protrudes through said insulating layer, and further comprising a metal coating deposited on said elongted member, said insulating layer, and the protruding portion of said transducer.
Claim 18
Dependent Claim
23 words
The vane of claim 15, wherein said conduit has a support mounted therein, and wherein said metal coating is soldered to said support.
References Cited (Backward Citations)
US2618579A
Cited
US2168943A
Cited
US3218851A
Cited
GB1266144A
Cited
FR2393275A1
Cited
GB1581975A
Cited
GB2052919A
Cited
GB2071848A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-23 | 1989-12-23 | 1990-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-23 | 1993-12-23 | 1994-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-23 | 1997-12-23 | 1998-06-24 | $7700.00 | Window Closed / Lapsed |