Optical interrupter system with vibration compensation
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United States of America Patent
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Oct 23, 1990
Grant Date -
N/A
app pub date -
Apr 20, 1989
filing date -
Apr 20, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The optical interrupter system includes a moving member having a sequence of optical flags, interposed between a source of illumination and a detector, such that as the optical flags of the moving member are illuminated and detected, the detector generates a signal having a waveform with a first portion less than a first threshold, a second portion greater than the first threshold and less than a second threshold, and a third portion greater than the second threshold. Signal processing circuitry operates to generate a count signal indicating a transition between the first and third waveform portions.
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