Circuits for obtaining a voltage reading from a sensing element

Details Circuits for obtaining a voltage reading from a sensing element Circuits for obtaining a voltage reading from a sensing element

1983-08-29

1985-06-04

Kreitman, Stephen A.

Measuring and testing

Gas analysis

Gas chromatography

G01N 2712

Patent

active

045206538

ABSTRACT:
A circuit (10) for obtaining a voltage reading (V.sub.o) from a sensing element is characterized by the following structure. A first circuit (12) connects a first end (14) of a voltage source (16) to a first end (18) of a resistance heater (20). A second circuit (22) connects a second end (24) of the voltage source to a second end (26) of the resistance heater. A sensing element (28) has two leads (30,32). A third circuit (34) connects lead (30) of the sensing element to an external circuit (36). A load resistor (40) is coupled between the second circuit and the third circuit. An interconnecting circuit (42) couples lead (32) of the sensing element intermediate the resistance heater. The electrical resistance of resistance heater is substantially less than the electrical resistance of the sensing element.

REFERENCES:
patent: 3868846 (1975-03-01), Kushida et al.
patent: 4007435 (1977-02-01), Tien
patent: 4471648 (1984-09-01), Uchida et al.

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