Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-09-19
1992-08-25
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
340550, H01J 516
Patent
active
051421410
ABSTRACT:
A fiber optic crack propagation measurement apparatus including an input optical fiber for receiving light energy and an output optical fiber connected to deliver light energy to a detector is disclosed. A plurality of shunt optical fibers are connected in parallel between the input and output optical fibers. The input optical fibers, output optical fibers and shunt optical fibers are secured to a structure in which stresses are expected to cause the advancement of a crack. As the crack grows, individual shunt fibers are broken, reducing the amount of light energy delivered to the detector. Detector signals are generated indicative of the light energy received thereby to report the advancement of the crack. In one embodiment, wavelength division multiplexing techniques are employed so that multiple crack measuring units can be monitored over a single monitoring optical fiber.
REFERENCES:
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patent: 4636638 (1987-01-01), Huang et al.
patent: 4781056 (1988-11-01), Noel et al.
patent: 4808814 (1989-02-01), Hofer et al.
patent: 4836030 (1989-06-01), Martin
patent: 5015842 (1991-05-01), Fradenburgh et al.
Biando Gary J.
Talat Kausar
Nelms David C.
The Boeing Company
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