Fiber optic interferometer

Details Fiber optic interferometer Fiber optic interferometer

1981-05-26

1983-04-19

Arnold, Bruce Y.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01B 902

Patent

active

043803946

ABSTRACT:
An interferometer is disclosed for optically sensing displacements in a surface. A first fiber optic waveguide receives light from a laser in one end and transports it to the other end where a portion is back reflected and a portion is projected upon the surface. The reflected light from the surface re-enters the fiber optic at the projecting end and combines with the back reflected signal to derive an optical information wave. This optical information wave is evanescently coupled to a second fiber optic waveguide which transports this wave to a detector. A specific amount of reflective matter is attached to the end of the first fiber optic waveguide to enhance reflection therefrom, and an optical energy absorber is fixedly attached to the other end of the second fiber optic waveguide to prevent internal back reflection within the second fiber optic waveguide.

REFERENCES:
patent: 4310905 (1982-01-01), Palmer
Bien, F., et al., "Absolute Distance Measurements by Variable Wave Length Interferometry", Applied Optics, vol. 20, No. 3, Feb. 1, 1981, pp. 400-403.

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