Measuring and testing – Fluid pressure gauge – Diaphragm
Patent
1992-10-01
1994-10-04
Chilcot, Jr., Richard E.
Measuring and testing
Fluid pressure gauge
Diaphragm
73726, G01L 900, G01L 904
Patent
active
053515498
ABSTRACT:
A pulsed pressure sensor circuit (11) with increased sensitivity for measuring low pressures. A pulse generation circuit (12) is enabled by a microprocessor (28) to output a voltage pulse. The voltage pulse biases a pressure sensor (17) which has a port exposed to a pressure to be sensed. The pressure sensor (17) outputs a differential voltage which is proportional to the pressure at the port. The differential voltage is amplified by an amplifier (23) which has an output coupled to the microprocessor (28). A voltage divider circuit (26) is coupled to the pulse generation circuit (12) and has an output coupled to the microprocessor (28). The microprocessor (28) samples the voltages at the output of the amplifier (23) and the output of the voltage divider circuit (26). Microprocessor (28) then calculates the pressure using the sampled voltages and data stored in memory.
REFERENCES:
patent: 3908460 (1975-09-01), Lichowsky
patent: 4250759 (1981-02-01), Vago et al.
patent: 4321832 (1982-03-01), Runyan
patent: 4362060 (1982-12-01), Okayama et al.
patent: 4680970 (1987-07-01), Ueda et al.
patent: 4798093 (1989-01-01), Kenoun
patent: 4958520 (1990-09-01), Trommler et al.
Baum Jeffrey
Schultz Warren J.
Bingham Michael D.
Chilcot Jr. Richard E.
Hoshizaki Gary W.
Motorola Inc.
Oen William L.
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