High power optical fiber failure detection system

Details High power optical fiber failure detection system High power optical fiber failure detection system

1987-02-03

1989-03-14

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250227, 356 731, 21912162, G01J 132

Patent

active

048126411

ABSTRACT:
A break or leak in an optical fiber transmitting high power laser energy, at average power levels sufficient for material processing, is detected promptly and the laser beam delivery system shut down when the optical fiber begins to fail. Photo detectors monitor the laser power out of the fiber and injection power into the fiber, in particular the light intensities in the fiber input and output couplers. A difference in detector outputs, larger than a set threshold to account for inherent fiber losses, is an indication that a break or leak has occurred.

REFERENCES:
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patent: 4543477 (1985-09-01), Doi et al.
patent: 4673291 (1987-06-01), Heckmann
patent: 4673795 (1987-06-01), Ortiz
patent: 4695697 (1987-09-01), Kosa
G. K. Lewis and R. D. Dixon, "Plasma Monitoring of Laser Beam Welds", Welding Research Supplement, Feb. 1985, pp. 49s-54s.

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