Single mode optical fiber polarimetric stress sensor having opti

Details Single mode optical fiber polarimetric stress sensor having opti Single mode optical fiber polarimetric stress sensor having opti

1984-07-31

1986-01-14

McGraw, Vincent P.

Optics: measuring and testing

Material strain analysis

With polarized light

73705, 250225, 250227, 250231P, G01B 1118, G01D 526

Patent

active

045642893

ABSTRACT:
An instrument for measuring stress is arranged to be insensitive to stresses caused by conditions other than that of the phenomenon to be measured. The instrument employs two equal lengths of optical fibers of the kind exhibiting birefringence when stressed. Polarized light is directed into one of the optical fibers along its longitudinal axis. The two optical fibers are arranged in series with respect to the longitudinal transmission of the polarized light through those fibers. A polarization rotator is situated in the light path between the two optical fibers. The polarized light transmitted through the polarization rotator is rotated by an amount causing stresses imposed equally on the two optical fibers to have equal and opposite effects of the transmitted polarized light. The invention may be embodied to permit the measurement of acceleration, pressure, fluid flow rate, magnetic field gradient, magnetic field strength, electric field strength, electric field gradient, or any other phenomena that can be made to produce stress on an optical fiber. The invention is especially useful in differential measurement because the device measures the difference in stress imposed on the two optical fibers.

REFERENCES:
patent: 3096388 (1963-07-01), Davenport
patent: 3602597 (1971-08-01), Sproul
patent: 3950987 (1976-04-01), Slezinger et al.
patent: 4269483 (1981-05-01), Feldtkeller
patent: 4368645 (1983-01-01), Glenn et al.
patent: 4442350 (1984-04-01), Rashleigh

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