Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1981-08-17
1984-04-10
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356 33, 350375, 73657, 324 96, G01B 1116
Patent
active
044423500
ABSTRACT:
A sensor is provided for sensing or detecting the presence of an environmental field condition such as acceleration, temperature change, magnetic or acoustic fields. The field is sensed by interference between two mutually orthogonal polarized eigenmodes in a single monomode optical fiber which may be disposed either linearly or wound on a mandrel made of compliant material for sensing an acoustic field, or made of magnetostrictive material for sensing a magnetic field. Polarized light propagated through the optical fiber is detected at its outlet independent of environmentally induced low frequency variations whereby the sensor may be maintained at quadrature and maximum sensitivity.
REFERENCES:
patent: 4173412 (1979-11-01), Ramsay et al.
patent: 4179217 (1979-12-01), Robert et al.
patent: 4255018 (1981-03-01), Ulrich et al.
patent: 4368645 (1983-01-01), Glenn et al.
Imoto et al; "Polarization Dispersion Measurement in Long Single-Mode Fib with Zero Dispersion Wavelength at 1.5 .mu.m"; IEEE Journal of Quantum Elec., vol. QE-17, No. 4, Apr. 1981, pp. 542-545.
Beers Robert F.
Ellis William T.
Nelms David C.
The United States of America as represented by the Secretary of
Walden Kenneth E.
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