Pulsed interferometric remote gauge

Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer

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Details

356352, 356356, G01B 1102

Patent

active

043091091

ABSTRACT:
The invention comprises a method and means for measuring the separation been two optical surfaces. A short-coherence-length laser pulse is projected upon two optical surfaces separated by a distance, d. The reflected, coincident beams are directed into a Michelson interferometer in which one plane mirror is replaced by a stepped mirror. The beams reflected from the two mirrors are directed onto a film where they form interference images. A formula using the number of channels, n, between successive interference fringes and the step width of the stepped mirror is used to calculate d.

REFERENCES:
patent: 3127465 (1964-03-01), Stephens
patent: 3319515 (1967-05-01), Flournoy

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