Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1987-02-12
1988-11-22
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356 4, G01N 2186
Patent
active
047868155
ABSTRACT:
An electro-optical sensor for measuring distance to a test surface, such as a road surface beneath a vehicle frame on which the sensor is mounted. The sensor includes a modulated light source for directing a light beam onto the test surface, and a photosensitive detector for receiving light diffusely deflected from the test surface and providing a pair of output signals indicative of orthogonal position coordinates of reflected light incident on the detector. The detector outputs are fed to amplifiers for obtaining sum and difference signals which are demodulated synchronously with energization frequency of the light source. Distance to the test surface is determined as a function of a ratio of the detector output differential to the detector output sum. In the preferred application of the invention for road profile measurement, a signal indicative of road profile is stored at increments of vehicle motion along the road surface.
REFERENCES:
patent: 4373805 (1983-02-01), Mallinson
patent: 4445029 (1984-04-01), Nagaoka et al.
patent: 4629882 (1986-12-01), Matsuda
patent: 4639140 (1987-01-01), Levat
patent: 4647209 (1987-03-01), Neukomm et al.
Brown Gordon R.
Walker Curtis M.
Allen Stephone B.
K. J. Law Engineers, Inc.
Nelms David C.
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