Measuring and testing – Fluid pressure gauge – Diaphragm
Patent
1978-07-27
1979-08-28
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Diaphragm
73708, 324 59, 324 98, 336 30, G01L 910
Patent
active
041656539
ABSTRACT:
A pressure measuring system which includes a variable reluctance pressure transducer energized from an alternating voltage source, wherein the ratio of the output voltage to the source voltage is proportional to the pressure being sensed. Precision full wave rectifiers convert the source and output voltages to reference and sensing direct voltage signals, respectively. A switching regulator regulates the higher amplitude reference voltage signal to have exactly the same average voltage as the sensing voltage signal. The switching regulator also regulates a constant voltage DC signal from a regulated power supply at the same switching duty cycle as the regulated reference voltage signal, to produce a direct voltage, pressure-sensing signal which is uneffected by voltage fluctuations in the alternating voltage source for the pressure transducer. After the DC offset corresponding to the lowest pressure difference to be measured is removed, this direct voltage, pressure-sensing signal is converted to a direct current signal to drive a DC ammeter, calibrated in units of pressure, which is connected to an unregulated DC power supply.
REFERENCES:
patent: 3308411 (1967-03-01), Roshala
patent: 3727463 (1973-04-01), Intraub
patent: 3757241 (1973-09-01), Kime et al.
patent: 3780587 (1973-12-01), Rivere
patent: 3826969 (1974-07-01), Eichelberger et al.
Gealow Jon C.
LaPorte Ronald J.
McDonald Thomas E.
McGraw-Edison Company
Woodiel Donald O.
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