| 摘要 |
PROBLEM TO BE SOLVED: To provide an FBG sensor system capable of accurately measuring a measuring object, even when the fiber length to FBG is longer than 80 km, by reducing the influence due to the Rayleigh scattered light generated in fiber, using optical pulse as the measuring light that enters the FBG. SOLUTION: This FBG sensor system comprises a wavelength-tunable light source 10 which oscillates light wavelength-swept by LD 1at a predetermined sweep period, containing the light with a predetermined wavelength range, and a pulse generator 11 which generates a pulse d, having a predetermined period for directing light with the predetermined wavelength range oscillated by the wavelength-tunable light source 10 to be incident into FBG 15 as measurement light, based on a sweep signal a output from the wavelength-tunable light source 10 for the wavelength-sweep, in response to the sweep signal. By turning on/off the drive current of the LD 1 of the wavelength-tunable light source 10 by a pulse d, an optical pulse, consisting of light with the predetermined wavelength range, is generated, and the optical pulse is directed to be incident into the FBG 15 as measuring light. COPYRIGHT: (C)2008,JPO&INPIT
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