Optical displacement sensor

Details Optical displacement sensor Optical displacement sensor

1987-05-15

1989-02-21

Rosenberger, Richard A.

Optics: measuring and testing

By polarized light examination

With light attenuation

7386124, 250227, G01J 516

Patent

active

048060160

ABSTRACT:
The optical displacement sensor modulates intensity of the light beam as a function of the physical displacement. The sensor includes a reflector positioned in a path of the light beam between a light source and a light detector. The reflector has a non-reflective portion surrounded by a reflective portion. Relative movement (displacement) of the beam and the reflector occurs as a function of a parameter which is being sensed. In a normal (no displacement) condition, the non-reflective portion can be positioned with respect to the light beam so that intensity of the light beam received by the detector is at a minimum, and the sensor is operating in a darkfield mode. Displacement from the normal position causes an increase in the light intensity received by the detector.

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patent: 4368430 (1983-01-01), Dale et al.
patent: 4372165 (1983-02-01), Pitt et al.
patent: 4414471 (1983-11-01), Rines
patent: 4416159 (1983-11-01), Williamson et al.
patent: 4470310 (1984-09-01), Tsuruoka et al.
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patent: 4501157 (1985-02-01), Perkinson et al.
patent: 4584883 (1986-04-01), Miyoshi et al.
patent: 4594450 (1986-06-01), Coursolle et al.
patent: 4626680 (1986-12-01), Martens et al.

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