Environmentally protected pressure transducers employing two ele

Details Environmentally protected pressure transducers employing two ele Environmentally protected pressure transducers employing two ele

1985-06-26

1987-09-22

Goldberg, E. A.

Electrical resistors

Strain gauge type

Fluid- or gas pressure-actuated

338 5, 338 42, G01L 122

Patent

active

046958177

ABSTRACT:
A transducer employs two separate pressure input ports. Each port is associated with a separate metal diaphragm behind which diaphragm is secured a transducer structure having a cup-shaped silicon pressure diaphragm which is retained within a hollow of the transducer which is oil filled. One transducer structure is a half bridge array and monitors the main pressure applied to the positive port. A full bridge is formed by two resistors associated with the positive port and two resistors in an array associated with the other port which is the negative port. The resistors in the array at the negative port are selected to be larger in magnitude than those at the positive port and exhibit a greater sensitivity per unit of applied pressure. By selecting the magnitudes of the resistors associated with each port as well as the sensitivity, the shunting of resistors at each port will cause the composite transducer to provide an output which is indicative of the pressure applied to the positive port as modified or corrected by the pressure applied to the negative port.

REFERENCES:
patent: 4092662 (1978-05-01), Daughton
patent: 4222277 (1980-09-01), Kurtz et al.
patent: 4287501 (1981-09-01), Tominaga et al.
patent: 4321578 (1982-03-01), Nagasu et al.
patent: 4395915 (1983-08-01), Singh

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