Fiber optical monitoring system for eletrical conductors and the

Details Fiber optical monitoring system for eletrical conductors and the Fiber optical monitoring system for eletrical conductors and the

1992-09-10

1994-02-01

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25022715, 374161, H01J 516

Patent

active

052834298

ABSTRACT:
An optical fiber sensing circuit can be used in a system to protect wires, cables and the like by sensing overtemperature and/or mechanical stress conditions in the wires, cables and the like. In one embodiment an optical fiber is placed in close proximity to the conductors running from the receptacle end to the plug end of an extension cord. The optical fiber has a core surrounded by a cladding, the core and cladding being constructed such that the difference between their respective indices of refraction varies with temperature, at least over a predetermined temperature range, and that the amount of light passing through the fiber varies with changes in this difference. Thus the transmission quality and quantity of light through the optical fiber are decreased when the fiber is heated or mechanically deformed. In the preferred embodiment, the received light is converted to an electrical signal and transferred to a signal level detector which provides an enabling output to a circuit interrupter when the electrical signal reaches a preset level. The circuit interrupter then operates to open circuit the conductors in the extension cord. In this embodiment a protective relay sensing element receives a signal directly from the element transducing the received light and, if the signal reaches a preset level, operates its movable contacts which function as a circuit interrupter to open circuit the conductors of the extension cord.

REFERENCES:
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M. Gottlieb, G. B. Brandt and J. Butler "Measurement of Temperature with Optical Fibers", ISA Transactions, vol. 19, No. 4 (1980) pp. 55-63.
M. Gottlieb, and G. B. Brandt, "Measurement of Temperature With Optical Fibers Using Transmission Intensity Effects", Industrical and Scientific Conference Management, Inc. Report for EPRI Control No. RP. 970 (1979) pp. 31-37.
Wing F. Young and Alan R. Johnston, "Effect of Temperature on Optical Fiber Transmission, Applied Optics", vol. 17, No. 23, (Dec. 1978), pp. 3703-3705.

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