Damage detection system

Details Damage detection system Damage detection system

2007-02-21

2008-12-30

Sohn, Seung C (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S227160

Reexamination Certificate

active

07470888

ABSTRACT:
A damage detection system including: a optical fiber sensor including a core portion to have a grating portion formed therein, the grating portion having gratings reflecting light, wherein a wavelength band of the reflected light changes when a distance between adjacent gratings changes; a light source to input broadband light into the core portion; two optical filters connected to an output end of the sensor; and an apparatus to perform arithmetic processing on output values of the optical filters, wherein each passband of the optical filters overlaps with the vibration range of the wavelength band, in which a center wavelength of one of the passbands is fixed to an upper area of a vibration center of a center wavelength of the reflected light and that of the other of the passbands is fixed to a lower area thereof.

REFERENCES:
patent: 5898502 (1999-04-01), Horiuchi et al.
patent: 6525308 (2003-02-01), Schmidt-Hattenberger
patent: 2005/0067559 (2005-03-01), Ogisu et al.
patent: 2005-098921 (2005-04-01), None

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