Optical displacement sensors

Details Optical displacement sensors Optical displacement sensors

1985-06-13

1987-12-08

Rosenberger, R. A.

Optics: measuring and testing

By polarized light examination

With light attenuation

250227, G01B 1114

Patent

active

047115785

ABSTRACT:
An optical displacement sensor comprises a light source 2 coupled to an optical fiber 1 the end 5 of which is directed onto a reflector 3 the displacement of which is to be measured. A lens 4 of appropriate focal length is positioned between the end of the optical fiber and reflector 3 to focus the light emitted from fiber 1 onto reflector 3 so that the amount of light reflected back is a function of the position of reflector 3. A signal detector 6 is also coupled to fiber 1 to detect and measure the light reflected back from reflector 3. Additionally a further light source 8 optical fiber 7 and detector 10 are provided with the end 9 of fiber 7 positioned at the focus of lens 4 so that the light reflected back to detector 10 is independent of the position of reflector 3. The ratio of the measurements from the two detectors gives the position of the reflector 3 with compensation for the effects of the deterioration of its reflectance.

REFERENCES:
patent: 3940608 (1976-02-01), Kissinger et al.
patent: 4201479 (1980-05-01), Lardon
patent: 4515479 (1985-05-01), Pryor

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