Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1976-12-27
1979-03-27
Buczinski, S. C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
250204, 356 4, G01C 300, G01J 136
Patent
active
041463277
ABSTRACT:
An optical triangulation gauging system utilizing the position of a scanned laser beam to determine the position of an unknown surface or material thickness by optical triangulation. The scanned laser beam is split into two components by a beam splitter, one component, the reference beam, is passed through a calibration reticle having alternate opaque and transparent bands. The alternate transmission and occultation of the beam viewed through the reticle is used to generate calibration pulses that accurately describe the location of the gauging beam. The gauging component of the scanned beam is projected on to the surface to be measured. The back scattered light from this surface is viewed at a given angle, through a lens system that focuses the light onto a split photo detector. The position of the reference beam is interrogated as the scan beam image passes from one side of the split detector to the other. The reticle line spacing, the view angle of the lenses, and the optical path lengths provide an accurate measurement of surface movement independent of surface color or composition.
REFERENCES:
patent: 2740901 (1956-04-01), Graham
patent: 3137756 (1964-06-01), Gunther et al.
patent: 3829220 (1974-08-01), Parkinson
patent: 4041505 (1977-08-01), Hartmann
Bodlaj et al., Applied Optics, vol. 15, No. 6, pp. 1432-1436, Jun. 1976. 356-361.
Autech
Buczinski S. C.
Cennamo Anthony D.
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