Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1987-08-20
1993-12-14
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356 731, H01J 516
Patent
active
052705374
ABSTRACT:
An apparatus is disclosed for testing the integrity of an optical fiber (23) from a single end of the fiber. A test light source (34) with a wavelength that is different from the primary light source (14) is directed into one end of the optical fiber (23). A spectrally selective dichroic material (32) is attached to the other end of the optical fiber (23). This material (32) transmits light of the wavelength of the primary light source (14) and reflects light of the wavelength of the test light source (34). A break or discontinuity in the optical fiber (23) can be detected by an attenuation in a pulse of light from the test light source (34) after it is transmitted though the optical fiber (23) and reflected back out of the optical fiber (23) by the dichroic material (32). This system can detect breaks or discontinuities in the optical fiber (23) with a high degree of resolution.
REFERENCES:
patent: 4207561 (1980-06-01), Steensma
patent: 4385832 (1983-05-01), Doi et al.
patent: 4403143 (1983-09-01), Walker et al.
patent: 4523092 (1985-06-01), Nelson
patent: 4685799 (1987-08-01), Brininstool
patent: 4708471 (1987-11-01), Beckmann et al.
Denson-Low W. K.
Nelms David C.
Santa Barbara Research Center
Schubert W. C.
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