| 摘要 |
PROBLEM TO BE SOLVED: To provide an FBG sensing system without use of two reflection wavelength bands of a FBG, capable of measuring the quantity of distortion using one reflection wavelength band and very small temperature characteristic, and excellent in wavelength utilizing efficiency. SOLUTION: An FBG sensing apparatus is provided with the FBG (a fiber Bragg grating) for reflecting a light having the predetermined wavelength band and shifting the reflection wavelength band due to a temperature change and the distortion, a light source for outputting the light having the reflection wavelength band of the FBG, and an apparatus for detecting the shift of the wavelength band of the light output from the light source and reflected from the FBG. Two FBGs are provided in the same reflection wavelength band. One of FBGs is installed so as to simultaneously receive the temperature change and the distortion. The other is installed so as to receive only temperature change. A difference between the shifts of the wavelength bands of two FBGs is detected as the quantity of the distortion by allowing the temperature changes to be compensated. COPYRIGHT: (C)2005,JPO&NCIPI
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