Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1986-08-20
1987-12-08
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250225, 250231R, 250231P, 73800, H01J 516
Patent
active
047120045
ABSTRACT:
Method and apparatus for compensating a phototransducer system for fiber optic transmission losses and optical source power fluctuations includes generating a broadband source light beam having a plurality of spectral components. The source light beam is transmitted to a polarizer which polarizes the light beam and directs it to a multiple wave retardation device. The retardation device retards the spectral components of the polarized light beam. The retarded light beam is injected into a photoelastic transducer which modulates the polarizations of the retarded light beam in accordance with pressure applied to the transducer. Each spectral component of the retarded light beam will be modulated by the transducer. However, the broadband light beam will remain, in sum, relatively invariant to the applied pressure. The modulated light beam is then passed through an analyzer, injected into a fiber optic cable, and transmitted to a beam splitter. The beam splitter provides a first light beam to a photodetector which detects the light intensity of all spectral components, which intensity is only affected by transmission losses and power fluctuations within the system. A second portion of the split light beam is passed through a narrow passband filter which passes only certain portions of the spectral components which do vary with the applied pressure and transmission losses and power fluctuations. The filtered signal is detected by a second photodetector. The photodetectors provide electrical signals to a processor which outputs an electrical signal corresponding to a ratio of the first and second electrical signals.
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Ruoff Jessica L.
Simmonds Precision Products Inc.
Westin Edward P.
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