Motion detector

Details Motion detector Motion detector

2005-06-21

2005-06-21

Patidar, Jay (Department: 2862)

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

C324S207250

Reexamination Certificate

active

06909278

ABSTRACT:
The motion detector includes at least one element moving at least temporarily, a circuit assembly for sensing the motional condition of the element comprising at least one sensor located adjoining the element and including a timed pulse activated oscillating circuit which is differingly damped depending on the motional condition of the element, a signal processing circuit for forming the signals of the oscillating circuit suitable for analysis in an analyzer receiving and analyzing the signals output by the signal processing circuit. The signal processing circuit of the motion detector includes a comparator, to the input of which at least the positive or negative half waves of the oscillating circuit signals are applied and to the other input of which a reference voltage is applied selected so that when the sensor is activated the output signal of the comparator changes its condition differingly frequently depending on the how the sensor is damped by the element.

REFERENCES:
patent: 4237517 (1980-12-01), Myers
patent: 004137695 (1993-05-01), None

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