Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-05-02
1991-10-29
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022723, H01J 516
Patent
active
050618474
ABSTRACT:
A detection device for measuring force and pressure is disclosed which includes a monomode optical fiber (1) into which polarized light is fed and, at the output of the fiber, is detected by a detection arrangement (4, 80, 81, 30, 40, 31, 41), which is sensitive to the polarization of the light. The detection arrangement is provided with means (30A, 31A) for analyzing the light according to at least two different polarization directions, forming an angle comprised between 30.degree. and 60.degree. between them. According to the invention, the device is provided with means (70, 71, 2) for feeding several non-correlated light signals, each polarized differently, into the input of the fiber, and with means (4) for distinguishing between the light signals in the said detection arrangement at the output of the fiber, which light signals have been fed into the input of the fiber. The invention is applied in intrusion detection, monitoring and security systems.
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Delmas Gilles
Hazan Jean-Pierre
Nagel Jean-Louis
Steers Michel
Botjer William L.
Messinger Michael
Nelms David C.
U.S. Philips Corp.
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