Sensor apparatus

Details Sensor apparatus Sensor apparatus

G - Physics

01

B

340/135.7

G01B 7/14 (2006.01) G01D 5/243 (2006.01)

Patent

CA 1269147

ABSTRACT Non-contacting sensor apparatus having two tank circuits from which an indication of the position of the moving part of the sensor is developed by measur- ing the relative resonance frequencies of the two tank circuits. As the moving part of the sensor changes position, the relative resonance frequencies of the two tank circuits change. The outputs of the two tank circuits are multiplexed and drive a pulse generator which develops a first series of pulses having a repe- tition rate which corresponds to the resonance frequen- cy of one of the tank circuits and a second series of pulses having a repetition rate which corresponds to the resonance frequency of the other tank circuit. The relative times required to count the same number of pulses of each series of pulses provides an indication of the position of the moving part of the sensor.

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