Phase detector for optical figure sensing

Details Phase detector for optical figure sensing Phase detector for optical figure sensing

1976-03-22

1977-06-21

Corbin, John K.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

356113, G02B 902

Patent

active

040308316

ABSTRACT:
Phase detection between interfering light beams in an interferometric sys is accomplished by frequency shifting the reference beam prior to combination with the interrogation beam and electro-optically scanning the resulting pattern to produce an FM electrical signal having the shift frequency as a carrier and the interrogated parameter as the modulation data. A phase lock loop is responsive to the FM signal to provide a D.C. signal that is analogous of rate of change of the interrogated parameter with scan, and which is integrated to provide an output voltage signal that is proportional to the interrogated parameter and the corresponding optical phase difference. The method and system employing it are operative for a wide range of phase differences including multiple fringes.

REFERENCES:
patent: 3175088 (1965-03-01), Herriott
patent: 3566021 (1971-02-01), Jakes, Jr.
patent: 3856986 (1974-12-01), Macouski

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