Stepping method permits higher amplitude modulation of secondary mirror of Fourier interferometer. Amplitude of mirror motion is limited only by available voltage drive on error-correcting actuator. Closed-loop controller provides servo error voltage linearly proportional to offset from proper null position. Bidirectional counter serves to count number of reference laser fringes offset from null position.
Stepping optical path difference in an interferometer
NASA Tech Briefs ; 1 , 1
1976-03-01
Sonstige
Keine Angabe
Englisch
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