Pulsed Interferometric Remote Gauge.
DEPARTMENT OF THE NAVY WASHINGTON DC
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The invention comprises a method and means for measuring the separation between 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. Author
- Lasers and Masers
- Test Facilities, Equipment and Methods