Patent US4122722A successfully refreshed from Google Patents.
US4122722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anemometer compensator linearizer
Assignee: Boeing Co
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Filing: 1977-03-31
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Granted: 1978-10-31
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Expires: 1997-03-31
Abstract
Abstract Fluid flow velocity and turbulence are computed by processing bridge excitation voltage provided in hot wire or hot film anemometry. A system utilizing a log converter circuit provides an output signal which is substantially linear with fluid temperature and a probe temperature setting potentiometer provides a signal voltage representative of the difference between hot probe operating temperature and the fluid temperature.
Inventors
- 👤 Stanley E. Newell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:57
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/26; G06G7/28; G01; G01F; G01F1/00; G01F1/68; G01F1/696; G01K; G01K7/00; G01K7/16; G01K7/22; G01K7/24; G01K7/25; G01P; G01P21/00; G01P21/02; G01P21/025; G01P5/00; G01P5/10; G01P5/12; G06G7/48; G06G7/57
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A system for providing an output signal which is substantially linear with fluid temperature comprising: operational amplifier circuit means having an output terminal; a thermistor probe having a resistance which is an exponential function of fluid temperature; said thermistor resistance connected in feedback path with said operational amplifier circuit means; log converter circuit means coupled to said output terminal of said operational amplifier circuit means for providing said output signal which is substantially linear with fluid temperature; a hot probe temperature setting potentiometer having a volts-per-degree temperature sensitivity equal to the volts-per-degree temperature sensitivity of said output signal; and, summing amplifier circuit means responsive to said output signal and connected to said probe temperature setting potentiometer for providing a signal voltage representative of the difference between hot probe operating temperature and the fluid temperature.
Claim 2
Independent Claim
134 words
A system for providing an output signal which is substantially linear with fluid temperature comprising: operational amplifier circuit means having an output terminal; a thermistor probe having a resistance which is an exponential function of fluid temperature; said thermistor resistance connected in feedback path with said operational amplifier circuit means; log converter circuit means coupled to said output terminal of said operational amplifier circuit means for providing said output signal which is substantially linear with fluid temperature; a hot probe temperature setting potentiometer having a volts-per-degree temperature sensitivity equal to the volts-per-degree temperature sensitivity of said output signal; and, summing amplifier circuit means responsive to said output signal and connected to said probe temperature setting potentiometer for providing a signal voltage representative of the difference between hot probe operating temperature and the fluid temperature.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-30 | 1982-05-01 | 1982-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-30 | 1986-05-01 | 1986-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-30 | 1990-05-01 | 1990-10-31 | $7700.00 | Window Closed / Lapsed |