System for comparing a reference signal with a filtered signal t

Details System for comparing a reference signal with a filtered signal t System for comparing a reference signal with a filtered signal t

1993-07-07

1994-09-27

Chilcot, Jr., Richard E.

Measuring and testing

Fluid pressure gauge

Diaphragm

3612834, 340626, G01L 912

Patent

active

053498640

ABSTRACT:
A simple, reliable, compact and inexpensive fluid pressure discontinuity analysis system includes a basic capacitive pressure transducer, made of two closely spaced insulating plates whose opposed faces contain conductive layers, and one of which plates is a flexible diaphragm of low mechanical hysteresis. The transducer is coupled to a variable pressure source which under normal operating conditions remains at a substantially constant pressure level. The output signal from the transducer has its high-frequency AC component attenuated by a low-pass filter, whose output in turn has its DC component substantially removed by capacitive blocking, after which the remaining AC output is then amplified by a circuit including an operational amplifier. This AC-amplified signal is then compared with a "reduced-magnitude average" reference signal (produced by an AC-to-DC conversion side-circuit followed by magnitude-level adjustment). The comparator output triggers a one-shot monostable multivibrator used to produce an on-off switching signal which operates an alarm signal.

REFERENCES:
patent: 4083234 (1978-04-01), Aono et al.
patent: 4329732 (1982-05-01), Kavli et al.
patent: 4388668 (1983-06-01), Bell et al.
patent: 4617607 (1986-10-01), Park et al.
patent: 4928255 (1990-05-01), Brennecke et al.

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