Abstract
An experimental study of lateral displacement sensing in the open atmosphere is described. A wave-front-folding type of interferometer is used to measure small displacement of a point-like laser source located 36 m away from the interferometer. The interferometer works in one of three modes of operation; the displacement is indicated in terms of (1) the shift of image position, (2) the change of phase front tilt, or (3) the frequency power spectrum of phase front variations. Emphasis is placed on how to suppress the atmospheric disturbances, and measurement errors are also discussed.
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