US3769839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic sensor
Assignee: Honeywell Inc
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Filing: 1971-05-03
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Granted: 1973-11-06
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Expires: 1991-05-03
Abstract
Abstract An acoustic oscillator adapted for use as a gas temperature sensor wherein a fluidic signal whose frequency is indicative of the temperature of the gas is generated by a hole-tone resonator. A housing member has first and second axially aligned orifices separated by an enclosed control volume. A jet passing through the orifices sets up oscillations which are reinforced by resonance of the control volume. The oscillations are further reinforced and stabilized by a second downstream chamber, which in the preferred embodiment is a half wavelength resonator. The half wavelength resonator terminates in a converging-diverging nozzle which promotes choked flow in the exhausting fluid, thereby making the sensor insensitive to variations in input pressure. The frequency of the oscillations thus produced is indicative of the temperature of the gas.
Inventors
- 👤 G Innes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:45
CPC Classifications
G; G01; G01K; G01K11/00; G01K11/22; G01K11/26
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
161 words
An acoustic temperature sensing oscillator which comprises housing means defining a control volume chamber and a downstream chamber, said housing means having a first orifice for admitting a stream of fluid into said control volume chamber, said housing means also having an outlet nozzle for exhausting fluid from said downstream chamber, said housing means further having a partition dividing said control volume chamber and said downstream chamber, said partition having a second orifice axially aligned with said first orifice for exhausting fluid from said control volume chamber to said downstream chamber so that acoustic oscillations are set up by a fluid jet passing through said first orifice and impinging on said second orifice, said downstream chamber comprising a half wavelength resonator for the frequency of oscillations produced, whereby said acoustic oscillations are reinforced and stabilized by resonance in said control volume chamber and in said half wavelength resonator, the frequency of said oscillations being indicative of the temperature of the fluid.
Claim 2
Dependent Claim
161 words
An acoustic temperature sensing oscillator which comprises housing means defining a control volume chamber and a downstream chamber, said housing means having a first orifice for admitting a stream of fluid into said control volume chamber, said housing means also having an outlet nozzle for exhausting fluid from said downstream chamber, said housing means further having a partition dividing said control volume chamber and said downstream chamber, said partition having a second orifice axially aligned with said first orifice for exhausting fluid from said control volume chamber to said downstream chamber so that acoustic oscillations are set up by a fluid jet passing through said first orifice and impinging on said second orifice, said downstream chamber comprising a half wavelength resonator for the frequency of oscillations produced, whereby said acoustic oscillations are reinforced and stabilized by resonance in said control volume chamber and in said half wavelength resonator, the frequency of said oscillations being indicative of the temperature of the fluid.
Claim 3
Dependent Claim
52 words
Apparatus according to claim 1 wherein said outlet nozzle comprises a converging-diverging nozzle having an area less than the area of said first and second orifices for promoting choked flow therethrough, whereby said acoustic temperature sensing oscillator is insensitive to changes in pressure of the fluid stream applied to said first orifice.
Claim 4
Dependent Claim
29 words
Apparatus according to claim 1 wherein said partition includes aperture means spaced from said axis, in addition to said second orifice for exhausting fluid from said control volume chamber.
Claim 5
Dependent Claim
18 words
Apparatus according to claim 1 wherein said housing further includes a quarter wavelength resonator adjacent said first orifice.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |