Device for measuring an optical path length difference

Details Device for measuring an optical path length difference Device for measuring an optical path length difference

2008-05-06

2008-05-06

Lyons, Michael A. (Department: 2877)

Optics: measuring and testing

By light interference

Using fiber or waveguide interferometer

Reexamination Certificate

active

07369248

ABSTRACT:
In measuring an optical path length difference, light from a light source is guided through a first and a second path. A three-way coupler combines light from the first and the second path in at least three combination, with at least three mutually different added relative phase displacements. A detector measures interference intensities of the at least three combinations. From the intensities, a calculation unit determines a phase difference between the light from the first and second path while eliminating an effect of a contrast between the light from the first and second path.

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patent: WO 97/21981 (1997-06-01), None
R. Fuest; Integrated Optical Michelson-Interferometer With Quadrature Phase Demodulation in Glass for Displacement Measuring; 8008 TM Technisches Messeń, 58 Apr. 1991, No. 4, Munchen, DE.
Fuest, R.; “Integrated optical Michelson-interferometer with quadrature phase demodulation in glass for displacement measuring”; Apr. 1, 1991; vol. 58, No. 4, pp. 152-157.

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