Eddy current distance signal apparatus with temperature change c

Details Eddy current distance signal apparatus with temperature change c Eddy current distance signal apparatus with temperature change c

1985-06-27

1987-12-29

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Displacement

324225, 324241, 340618, G01B 714, G01F 2300, G01R 3312

Patent

active

047163666

ABSTRACT:
Eddy current distance measuring apparatus includes a multiplier connected to one secondary coil of a pair of secondary coils in an eddy current sensor. The secondary coil outputs are inputted to a differential amplifier, and the resulting difference is adjusted to be zero when an object the distance to which is to be measured is not present. Thereafter, the sensor is located within measuring distance of, e.g., a steel plate, and the output of the differential amplifier is combined by an amplifier circuit with an oscillator output supplying a current to the primary coil of the sensor. An eddy current distance signal output is thus obtained.

REFERENCES:
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patent: 3440532 (1969-04-01), Chung
patent: 3609527 (1969-05-01), Ellis
patent: 4000448 (1976-12-01), Shum et al.
patent: 4030027 (1977-06-01), Yamada et al.
patent: 4088952 (1978-05-01), Sikora
patent: 4283680 (1981-08-01), Kerr
patent: 4492925 (1985-01-01), Kammerer et al.
patent: 4567435 (1986-01-01), Yamada et al.
Patents Abstracts of Japan, vol. 7, No. 42, (p-177)(1187), 19th Feb. 1983; & JP-A-57 57 192, (Nippon Kokan K.K.), 27-11-1982.
Patents Abstracts of Japan, vol. 6, No. 133, (P-129)(1011), 20th Jul. 1982; & JP-A-57 57 202, (Nippon Kokan K.K.), 06-04-1982.

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