Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1996-02-27
1998-10-27
Buczinski, Stephen C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
342134, 342135, G01C 308, G01S 1308
Patent
active
058284435
ABSTRACT:
Disclosed herein is a distance measuring apparatus comprising an irradiation unit for generating an electromagnetic wave, a receiving unit for receiving a reflected wave of the electromagnetic wave reflected by an object of measurement and generating a reception signal, and a propagation delay time measuring unit for measuring a propagation delay time by counting the number of pulses of a pulse train having a predetermined frequency. The propagation delay time is the time between the time that the irradiation unit irradiates the electromagnetic wave and the time that the reflected wave is received by the receiving unit. The vehicle distance measuring apparatus further comprises an electric discharge unit for performing an electric discharge from the time that the reflected wave is received by the receiving unit, a discharge-voltage measuring unit for measuring a discharge voltage of the discharge unit, and a distance computing unit for correcting the counted number of pulses, based on the propagation delay time and the measured discharge voltage, and computing a distance to the object.
REFERENCES:
patent: 3618089 (1971-11-01), Moran
patent: 3630616 (1971-12-01), Everest
patent: 3666367 (1972-05-01), Farnsworth et al.
patent: 4477184 (1984-10-01), Endo
patent: 5243553 (1993-09-01), Flockencier
Fujioka Hiroshi
Tanaka Shoichi
Buczinski Stephen C.
Mitsubishi Denki & Kabushiki Kaisha
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