Method and apparatus for compensation of time-varying...

Details Method and apparatus for compensation of time-varying... Method and apparatus for compensation of time-varying...

2005-01-04

2005-01-04

Turner, Samuel A. (Department: 2877)

Optics: measuring and testing

By light interference

Having light beams of different frequencies

C356S498000, C356S500000

Reexamination Certificate

active

06839141

ABSTRACT:
In general, in one aspect, the invention features a method, including interferometrically measuring first and second optical path lengths to a measurement object along respective first and second paths, wherein the measurement of the optical path lengths includes directing first and second measurement beams to reflect from the measurement object, measuring propagation directions of the first and second measurement beams, compensating the first measured optical path length for time-varying optical properties of gas in the first path based on the first and second measured optical path lengths and the first and second measured propagation directions.

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