Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1982-11-19
1984-12-11
Sikes, William L.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
350 9623, 350 9629, G02B 514, G02B 5172
Patent
active
044880405
ABSTRACT:
A fiber optic sensor useful, for example, in intrusion detection systems for sensing seismic or pressure disturbances produced by an intruder, comprises a cable having an optical fiber core for transmitting the output of a laser, a hard preferably electrically nonconductive strand wound helically on and coextensive with the fiber, and a compliant tubular sleeve over the fiber and strand. The coils of the strand are axially spaced apart and circumferentially engage the fiber. The sleeve fits snugly over the strand and fiber and transmits through the strand coils to the fiber forces resulting from disturbances to be detected, subjecting the fiber to bending stresses. With cable connected at one end to the laser output, the polarization of light transmitted by the fiber is changed by the induced stresses and is detected at the other end of the cable to indicate the occurrence of the disturbance.
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Giallorenzi et al., IEEE J. of Quantum Electronics, vol. QE-18, No. 4, Apr. 1982, "Optical Fiber Sensor Technology," pp. 626-665.
Alekseer et al., Sov. Tech. Phys. Lett., 5(7), Jul. 1979, "Polarization Modulation of the Radiation . . . ," pp. 367-368.
Bykov et al., Sov. Tech. Phys. Lett., 6(1), Jan. 1981, "Polarization Modulation of Light . . . ," pp. 24-25.
Hocker, Applied Optics, vol. 18, No. 21, Nov. 1979, "Fiber Optic Acoustic Sensors with Composite Structure: an Analysis," pp. 3679-3683.
Gonz/a/ lez Frank
GTE Products Corporation
Lawler John F.
Sikes William L.
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