Velocity servo for continuous scan Fourier interference spectrom

Details Velocity servo for continuous scan Fourier interference spectrom Velocity servo for continuous scan Fourier interference spectrom

1978-02-24

1980-03-18

Clark, Conrad J.

Optics: measuring and testing

By particle light scattering

With photocell detection

G01B 902

Patent

active

041936930

ABSTRACT:
A velocity servo for a continuous scan Fourier interference spectrometer of the double-pass retroreflector type having two "cat's eye" retroreflectors uses an open-loop, lead-screw drive system for one retroreflector with compensation for any variations in speed of drive of the lead screw provided by sensing any variation in the rate of reference laser fringes, and producing an error signal from such variation used to compensate by energizing a moving-coil actuator for the other retroreflector optical path, and energizing (through a highpass filter) piezoelectric actuators for the secondary mirrors of the retroreflectors.

REFERENCES:
patent: 3488123 (1970-01-01), Nichols
patent: 3535041 (1970-10-01), Webb
patent: 3809481 (1974-05-01), Schindler
patent: 3936193 (1976-02-01), Auth

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