Communications: electrical – Continuously variable indicating – With particular transmitter
Patent
1979-04-24
1980-12-09
Robinson, Thomas A.
Communications: electrical
Continuously variable indicating
With particular transmitter
324 61R, 340347P, G08C 1916, G01R 2726
Patent
active
042387825
ABSTRACT:
A device for measuring the amount of movement of a moving object is provided with a sensor unit made up of the moving object and stationary members arranged to form two capacitors therebetween. The confronting surfaces of the moving object and stationary members are graduated with gear-like cuts so that while the capacitance of one capacitor is maximum, the capacitance of the other capacitor is minimum. The device further comprises a pair of oscillators coupled to the two capacitors, and a mixer connected to the oscillators so that the difference in capacitance between the capacitors is obtained as the difference in frequency, which is processed to provide the amount of movement of the moving object.
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