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

1989-11-13

1991-08-27

Lateef, Marvin M.

Electrical resistors

Resistance value responsive to a condition

Ambient temperature

338 25, 338 22R, H01C 304

Patent

active

050436929

ABSTRACT:
A temperature sensor. Two thick films resistor elements are mounted to a substrate and then a thermistor coupled to those elements 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:
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patent: 4085399 (1978-04-01), Wall
patent: 4186368 (1980-01-01), White et al.
patent: 4300392 (1981-11-01), Bloomer et al.
patent: 4332081 (1982-06-01), Francis
patent: 4437048 (1984-03-01), Clayton, Jr.
patent: 4841274 (1989-06-01), Yagher et al.
patent: 4881057 (1989-11-01), Garcia et al.
patent: 4882908 (1989-11-01), White

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