Optics: measuring and testing – Range or remote distance finding – With photodetection
Reexamination Certificate
2008-02-29
2009-06-30
Alsomiri, Isam (Department: 3662)
Optics: measuring and testing
Range or remote distance finding
With photodetection
C356S005010
Reexamination Certificate
active
07554652
ABSTRACT:
A rangefinding device and a method for determining the range of an object from a rangefinding device are provided. A train of light pulses each having an emission time and a pulse duration is generated. The pulse duration is set to twice the round-trip time to a maximum range of the device. The light pulses are reflected back toward the device by the object and detected according to three time intervals, respectively determined by a background gate, a ranging gate and a pulse energy gate. The light energy received during each interval is integrated and the integrated light value corresponding to the ranging gate is normalized using the values from the other two intervals. The range of the object is determined from the normalized ranging measurement and calibration data.
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Babin François
Cantin Daniel
Alsomiri Isam
Institut National D'Optique
Merchant & Gould P.C.
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