Oscillators – Beat frequency – Frequency or amplitude adjustment or control
Patent
1979-10-18
1982-01-12
Grimm, Siegfried H.
Oscillators
Beat frequency
Frequency or amplitude adjustment or control
324 61QS, 331 65, 34087037, 361280, G01R 2726, H03B 2101
Patent
active
043108067
ABSTRACT:
A linear-moving type displacement detector has a movable electrode disposed between a pair of stationary electrodes such a manner that the electrodes are in parallel with one another, thus forming a pair of variable capacitors. The movable electrode is movable in a direction forming an angle with the stationary electrodes while being kept parallel with the stationary electrodes, so that one of the capacitances of the two capacitors is increased with the movement of the movable electrode, while the other is decreased, and vice versa. The capacitors are coupled to oscillators, the output frequencies of the oscillators are mixed in a mixer, to provide the difference frequency therebetween, or some analogous signal which is responsive to the difference frequency. The difference frequency or the analogous signal is utilized for displacement measurement.
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