Electrothermal measurement of levels compensated for ambient tem

Details Electrothermal measurement of levels compensated for ambient tem Electrothermal measurement of levels compensated for ambient tem

1985-05-01

1987-02-03

Yasich, Daniel M.

Measuring and testing

Liquid level or depth gauge

Thermal type

219492, 307118, 364509, G01F 2324

Patent

active

046401270

ABSTRACT:
In a method for the electrothermal measurement of level which is compensated for ambient temperature and in which a resistance probe is heated with a constant current in each case during a heating time, a comparison is effected between a first variable formed from at least one probe voltage at the start of the heating time and a second variable formed from at least one probe voltage at the end of the heating time. The forming of at least one of the two variables is effected in accordance with a time function. In order to reduce the influence of disturbing effects and, in particular, voltage noise pulses, the first variable is formed by integration of the probe voltages from the start of the heating time up to the middle of the heating time. The second variable is then formed by integration of the probe voltages from the middle of the heating time until its end. The two integrals are then subtracted from one another to produce a measurement value.

REFERENCES:
patent: 3947665 (1976-03-01), Hundley
patent: 4116045 (1978-09-01), Potter
patent: 4118779 (1978-10-01), Tanei et al.
patent: 4425795 (1984-01-01), Albrecht et al.
patent: 4513616 (1985-04-01), Bezard et al.
patent: 4525792 (1985-06-01), Clinton
Method & Apparatus for the Electrothermal Measurement of Level Compensated for Ambient Temperature, D. Schneider, SAE Conference Sensors & Actuators, pp. 1-9.

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