Wide range fiber optical displacement sensor

Details Wide range fiber optical displacement sensor Wide range fiber optical displacement sensor

1990-08-28

1991-11-26

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25022711, 250577, H01J 516

Patent

active

050685279

ABSTRACT:
A fiber optical displacement sensor having a wider range of measurable distances and displacements. The fiber optical displacement sensor includes a light source means for continuously providing a projection beam of a certain wavelength and a reference beam having another different wavelength. The projection beam and the reference beam are combined by a first photo coupler and transmitted through a projecting optical fiber. Only the projection beam is separated out by a first filter and transmitted to a vicinity of the surface to be measured. On the other hand, the reflection beam and the reference beam separated by the first filter are combined by a second photo coupler, transmitted through a receiving optical fiber, and separated out by a second filter before being processed.

REFERENCES:
patent: 4596925 (1986-06-01), Gilby
patent: 4687927 (1987-08-01), Iwamoto et al.

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