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.
Abstract: A compact data recorder includes angular rate sensors for monitoring rotational movement about three axes. Three linear accelerometers, or one triaxial linear accelerometer, track linear movement along the same three axes. A processor and memory record outputs from the angular rate sensors and the linear accelerometers.
Abstract: An acceleration recorder and related method for monitoring, discriminating, and recording acceleration events only when the acceleration and calculated velocity change both exceed selected trigger values. While the acceleration values meet a first, user-defined threshold, the acceleration values are integrated to calculate a velocity change value. If the velocity change value meets a second, user-defined threshold, the acceleration event, including the velocity change, is recorded in memory.
Type:
Grant
Filed:
January 14, 1998
Date of Patent:
September 26, 2000
Assignee:
Instrumented Sensor Technology, Inc.
Inventors:
Gregory D. Hoshal, Rodney J. Lambert, Stefano A. M. Lassini
Abstract: A method and apparatus for recording time history data of physical variables during a recording session divided into discrete time windows each uniquely paired with a discrete segment of memory. Each recordable event is stored in the segment of memory corresponding to the time window during which it occurred. If the corresponding segment of memory is filled, the event is processed using an overwrite scheme that considers for replacement only those events in that segment of memory.
Type:
Grant
Filed:
April 25, 1995
Date of Patent:
May 19, 1998
Assignee:
Instrumented Sensor Technology, Inc.
Inventors:
Gregory D. Hoshal, Matthew R. Busdiecker, Jack H. Jenkins