Measuring and testing – Fluid pressure gauge – With pressure and/or temperature compensation
Patent
1981-03-09
1983-07-12
Kreitman, Stephen A.
Measuring and testing
Fluid pressure gauge
With pressure and/or temperature compensation
73766, 73718, 73724, G01L 1904, G01L 1912
Patent
active
043923828
ABSTRACT:
A capacitive pressure transducer 10 with an analog output voltage which varies linearly as a function of sensed pressure is provided. A capacitive pressure sensor C.sub.x provides a pressure variable capacitance that determines the frequency of a sensor oscillator 11. The oscillator frequency is combined with a reference frequency by a pair of D-type flip-flops 18 and 19 to provide a resultant signal having a duty cycle related to the sensed pressure. The resultant signal is integrated to provide a first analog signal as an input to a controllable gain amplifier 24 which receives gain control information from a non-linear gain control circuit 40 that receives an analog control signal as an input. The analog control signal varies as a function of sensed pressure in an opposite manner to said first analog signal. Said non-linear circuit provides for non-linearly varying the gain of amplifier 24 as a function of sensed pressure. Preferably the non-linear circuit 40 includes temperature compensating diodes 47. The output of the amplifier is a temperature compensated output signal which has a substantial linear variation as a function of sensed pressure.
REFERENCES:
patent: 3703828 (1972-11-01), Bullard, Jr. et al.
patent: 3841150 (1974-10-01), Pearson
patent: 3886473 (1975-05-01), Heyck
patent: 4000643 (1977-01-01), Pearson
patent: 4165653 (1979-08-01), Morehouse
patent: 4176557 (1979-12-01), Johnston
patent: 4178621 (1979-12-01), Simonelic et al.
patent: 4202218 (1980-05-01), Romo
patent: 4204244 (1980-05-01), Ho
patent: 4226125 (1980-10-01), Waugh
patent: 4227419 (1980-10-01), Park
patent: 4250452 (1981-02-01), Gray et al.
patent: 4255632 (1981-03-01), Ho
patent: 4289035 (1981-08-01), Lee
patent: 4322977 (1982-04-01), Sell et al.
patent: 4337665 (1982-07-01), Sato et al.
Carlson David U.
Gillman James W.
Kreitman Stephen A.
Melamed Phillip H.
Motorola Inc.
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