Temperature compensation circuit for sensor of physical variable

Details Temperature compensation circuit for sensor of physical variable Temperature compensation circuit for sensor of physical variable

1975-08-14

1976-06-29

Queisser, Richard C.

Electricity: power supply or regulation systems

Remote sensing

73 885R, 73393, 73398R, 323 75F, 307310, G01L 902, G01L 1904

Patent

active

039671887

ABSTRACT:
A temperature compensation circuit for sensors of physical variables, such as temperature and pressure, employs an effective constant current source that is sensitive to ambient temperature and which has an adjustable thermal slope and an adjustable output at discrete temperatures. The effective constant current source may be connected across the input terminals of a sensor such as a pressure transducer employing strain gages or it may be connected in series with the excitation current of such a transducer. Additionally, the effective constant current source may be connected in the output of a sensor such as a thermocouple that is responsive to temperature changes. When connected to the input of a sensor, the temperature compensation circuit controls the excitation current through the sensor as a function of the ambient temperature of the sensor and compensation circuit. When connected in the output of the sensor, the temperature compensation circuit provides a voltage that is a function of the ambient temperature, which voltage is added to the output of the sensor to compensate for voltage variations due to changes in ambient temperature.

REFERENCES:
patent: 3111620 (1963-11-01), Baker
patent: 3192405 (1965-06-01), Patchell
patent: 3461380 (1969-08-01), McGhee
patent: 3495159 (1970-02-01), Smith
patent: 3513430 (1970-05-01), Heller
patent: 3646815 (1972-03-01), Martin et al.
patent: 3654545 (1972-04-01), Demark
patent: 3706047 (1972-12-01), Gunzel
patent: 3831042 (1974-08-01), LaClaire

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