Fiber optic hot spot detector

Details Fiber optic hot spot detector Fiber optic hot spot detector

1980-06-23

1981-11-03

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

73356, G02B 514

Patent

active

042987946

ABSTRACT:
A hot spot detector for a power cable, or the like, includes an optical fiber having a plurality of cores including an input core into which light energy is coupled. The core diameters, spacing, and materials of the cores and the cladding are carefully selected so that cross-talk from the input core to the secondary cores occurs only in the vicinity of the point along the fiber where the hot spot is located. Light energy then propagates along the secondary cores and modal interference causes a beat phenomena producing spatial interference that can be analyzed as energy flow between the secondary cores. By measuring the light intensity patterns emerging from the secondary cores at at least two distinct wavelengths, the location of the hot spot along the fiber can be calculated.

REFERENCES:
patent: 3981592 (1976-09-01), Williams
patent: 4136566 (1979-01-01), Christensen
patent: 4151747 (1979-05-01), Gottlieb et al.
patent: 4201446 (1980-05-01), Geddes et al.

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