Optical triangulation distance sensing system and method using a

Details Optical triangulation distance sensing system and method using a Optical triangulation distance sensing system and method using a

1997-07-10

1999-07-13

Evans, F. L.

Optics: measuring and testing

By polarized light examination

With light attenuation

356 304, 250205, 25055931, 25055938, G01B 1100

Patent

active

059234270

ABSTRACT:
A distance sensing system employs an optical triangulation system and a position sensitive device (PSD). The PSD generates a pair of current signals when a target reflects light from a light source back to the surface of the PSD. An automatic power control circuit is used to keep one of the current signals a constant value. The position of the reflected light spot on the PSD is linearly proportional to the other current generated by the PSD according to the formula:

REFERENCES:
patent: 4589773 (1986-05-01), Ido et al.
patent: 5055664 (1991-10-01), Ryczek
patent: 5644141 (1997-07-01), Hooker et al.

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