Pulsed light identifying system
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United States of America Patent
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Apr 16, 1991
Grant Date -
N/A
app pub date -
Aug 15, 1989
filing date -
Apr 6, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A light identifying system includes a photoelectric conversion unit for receiving a pulsed light from a light emitting part on a light receiving part to generate a light reception signal that varies in magnitude according to the quantity of the received light. A peak holding circuit has a time constant that is long compared with the pulse interval of the pulsed light. The peak holding circuit stores a peak value of the light reception signal for its time constant. The peak value is divided by a constant for application to a comparator. The comparator compares it with the light reception signal as a threshold. A peak value of the light reception signal is held, and the peak value thus held is specified as a threshold to the light reception signal, therefore in the unlikely event of decrease in the quantity of emitted light due to a secular change or of decrease in the quantity of received light due to mist and oil film, the threshold decreases accordingly.
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