Portable device for detecting short duration energy pulses
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United States of America Patent
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-
Aug 25, 1992
Grant Date -
N/A
app pub date -
Sep 15, 1989
filing date -
Sep 15, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A portable laser detection device is disclosed. Optical pulses are sensed by a photodiode and if the pulse width is less than a predetermined value a laser occurred indicator will flash until reset by the user. A laser present indicator will flash and an intermittent audible tone will be generated as long as laser energy having certain characteristics is present. A delay circuit ensures error free detection if a pulse having a width greater than the predetermined value is received immediately after a pulse having a width less than the predetermined value is received. Further, a high energy pulse with a sufficiently fast rise time received by the detector will cause the laser occurred indicator to flash, the laser present indicator to be illuminated continuously, and an audible tone to be generated. The device is shielded against electromagnetic interference and adapts automatically to variations in background noise.
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