Path length control signal derivation circuit for a laser angula

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

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G01C 1964

Patent

active

047814624

ABSTRACT:
Electro-optical apparatus for the control of the optical path length in a laser angular rate sensor. An output of a fringe detector dual photodiode and preamplifier, normally present, is processed to recover a laser intensity component present as an amplitude modulation superimposed on the phase-modulated fringe detector signal. The laser intensity component is then provided as an input to the optical path length feedback control system.

REFERENCES:
patent: 4320974 (1982-03-01), Ljung
patent: 4551021 (1985-11-01), Callaghan et al.

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