US4196626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flueric notch filter temperature or density sensor
Assignee: United States Department of the Army
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Filing: 1978-11-27
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Granted: 1980-04-08
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Expires: 1998-11-27
Abstract
Abstract The temperature sensors shown utilize a constant frequency fluidic oscillr to excite resonance tubes, whose frequency response is a function of temperature. The outputs of these sensors control a fluidic amplifier, whose output is rectified and filtered to produce a D.C. fluid signal which is a function of the sensed temperature. Different embodiments utilize resonance tubes excited in phase or 180° out of phase to sense the difference between two temperatures or to provide increased sensitivity.
Inventors
- 👤 Francis M. Manion
- 👤 Tadeusz M. Drzewiecki
- 👤 Richard M. Phillippi
- 👤 Charles E. Paras
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:17
CPC Classifications
G; G01; G01K; G01K11/00; Y; Y10; Y10T; Y10T137/00; Y10T137/206; Y10T137/2229; Y10T137/2234
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
52 words
A temperature sensing device comprising: (a) Generating means for generating constant frequency pressure pulses, said generating means having a first output (b) A temperature sensing means comprising a first resonance tube for modulating the amplitude of said pressure pulses from said first output as a function of the temperature to be sensed.
Claim 2
Dependent Claim
52 words
A temperature sensing device comprising: (a) Generating means for generating constant frequency pressure pulses, said generating means having a first output (b) A temperature sensing means comprising a first resonance tube for modulating the amplitude of said pressure pulses from said first output as a function of the temperature to be sensed.
Claim 3
Dependent Claim
12 words
The device of claim 1 wherein said resonance tube is open ended.
Claim 4
Dependent Claim
13 words
The device of claim 1 wherein said generating means comprises a fluidic oscillator.
Claim 5
Dependent Claim
35 words
The device of claim 3 wherein said generating means has a second output and the device further comprises a second resonance tube, said second resonance tube modulating the amplitude of pulses from said second output.
Claim 6
Dependent Claim
21 words
The device of claim 4 further comprising a summing means to combine the outputs of said first and second resonance tubes.
Claim 7
Dependent Claim
27 words
The device of claim 5 wherein the output pulses from said first and second resonance tubes are in phase and said summing means functions as a subtractor.
Claim 8
Dependent Claim
29 words
The device of claim 5 wherein the output pulses from said first and second resonance tubes are 180° out of phase and said summing means functions as an adder.
Claim 9
Dependent Claim
19 words
The device of claim 5 further comprising a fluidic rectifying means to rectify the output of said summing means.
Claim 10
Dependent Claim
24 words
The device of claim 8 further comprising a fluidic filter receiving the output of said rectifying means to filter out high frequency pressure pulses.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-08 | 1983-10-08 | 1984-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-08 | 1987-10-08 | 1988-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-08 | 1991-10-08 | 1992-04-08 | $7700.00 | Window Closed / Lapsed |