Data recorder suitable for use as a railcar hunting detector
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United States of America Patent
Stats
-
Jan 9, 2007
Grant Date -
Mar 9, 2006
app pub date -
Sep 3, 2004
filing date -
Sep 3, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A data recorder for use as a hunting detector includes a piezofilm accelerometer. A bandpass filter tuned to the approximate frequency of a hunting railcar couples the output of the accelerometer to a hold circuit. A controller, operating primarily in a low power consumption 'sleep' mode, awakens periodically to check the hold circuit. If the contents of the hold circuit is greater than a predetermined value, a counter is incremented. When the counter exceeds a preset limit, then a flasher on the exterior of the data recorder is enabled.
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