Temperature sensing apparatus and method of making same

Details Temperature sensing apparatus and method of making same Temperature sensing apparatus and method of making same

1987-09-28

1989-11-14

Shaw, Clifford C.

Electrical resistors

Resistance value responsive to a condition

Ambient temperature

H01C 304

Patent

active

048810576

ABSTRACT:
A temperature sensor. Two thick film resistor elements are mounted to a substrate and then a thermistor coupled to those elments to form a voltage divider. The resistance of the thermistor is determined at a reference temperature and the thick film resistor elements are precisely trimmed using a laser trimming system to produce a precision voltage divider. To sense temperatures the voltage divider is energized and its resistance ratio is sensed utilizing a bridge circuit.

REFERENCES:
patent: 4085399 (1978-04-01), Wall
patent: 4186368 (1980-01-01), White et al.
patent: 4670734 (1987-06-01), Caddock

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