Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1975-03-20
1977-08-09
Wilbur, Maynard R.
Optics: measuring and testing
Range or remote distance finding
With photodetection
33287, 356 4, G01C 300, E01B 2904
Patent
active
040407381
ABSTRACT:
Apparatus for sensing the profile, spacing and/or alignment of railroad tracks comprising one or more assemblies or pairs of range sensor units, preferably at least one directing a light image upon the top surface of a track rail and at least one directing a similar light image on the lateral side surface of the track rail. Each of the range sensor units includes optical sensing means positioned for receiving only the diffused image reflected upon the associated rail surface along a given axis making preferably a substantial angle to the axis along which the light image is directed upon the rail surface. The axes preferably lie in a plane extending longitudinally of the rail and make a substantial angle to both the vertical and horizontal planes. One or more pairs of range sensor units like that referred to which direct light images on the top and side surfaces of the same rail are preferably enclosed in a common sealed housing having windows for receiving respectively the projected and reflected light images directed upon and reflected from the top and side rail surfaces. A shield which is preferably provided which shields the range sensor units from appreciable stray light, dirt and the like.
REFERENCES:
patent: 3562419 (1971-02-01), Stewart et al.
patent: 3679307 (1972-07-01), Zoot
patent: 3723003 (1973-03-01), Vockenhuber
patent: 3778157 (1973-12-01), Brelot et al.
patent: 3864039 (1975-02-01), Wilmarth
patent: 3885872 (1975-05-01), Howe, Jr. et al.
patent: 3899251 (1975-08-01), Frenk et al.
Buczinski S. C.
Gulton Industries Inc.
Wilbur Maynard R.
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