Circuit arrangement for measuring a mechanical deformation, in p

Details Circuit arrangement for measuring a mechanical deformation, in p Circuit arrangement for measuring a mechanical deformation, in p

1990-09-07

1992-08-04

Ng, Jin F.

Measuring and testing

Fluid pressure gauge

With pressure and/or temperature compensation

330256, G01L 1904

Patent

active

051348853

ABSTRACT:
A circuit arrangement for measuring a mechanical deformation includes a pressure sensor with compression-deformable resistors for generating an analog deformation-dependent signal and a circuit for evaluating the analog deformation-dependent signal. The evaluating circuit includes a summing amplifier and a temperature-dependent coupling resistor connected between the input of the summing amplifier and the pressure sensor. The coupling resistor has a temperature coefficient adjusted to compensate for the temperature characteristic of the measuring sensitivity of the analog deformation-dependent signal. A temperature sensor generates a temperature-dependent signal corresponding to a static temperature characteristic of the evaluating circuit. There is provided a circuit for applying the temperature-dependent signal to the input of the summing amplifier to combine it with the analog deformation-dependent signal. The summing amplifier generates at its output a temperature-compensated, deformation-dependent output signal.

REFERENCES:
patent: 3528022 (1970-09-01), Adams
patent: 4667516 (1987-05-01), Schulz
patent: 4813272 (1989-03-01), Miyazaki et al.
patent: 4836027 (1989-06-01), Hannappel et al.
"Integrated Pressure Transducer", Measurement Techniques, vol. 20, No. 5, May 1977, Vaganov et al., pp. 706-707.

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