Main field of this invention is field of optical fiber sensor. The sensor by this invention to be used by the measurement of the physical amount, at least, The optical fiber for measurement which one Bragg grating (12) is included at least (10) with, After the interaction of the 2nd wave where above-mentioned in the fiber, it fills the 1st, pump wave at 1st optical frequency, in order to fill the 2nd, probe wave at 2nd optical frequency, the optical expedient which is designed (20) being, as for 2nd optical frequency, as for Bragg grating, in order to reflect the 1st and 2nd light wave, is designed unlike 1st optical frequency, as for optical power of the 1st wave, is reflected by induced Brillouin scattering, the Stokes waveAlthough it gives, it is sufficient, frequency of the Stokes wave displays the suffering measurement physical amount, optical expedient (20) with, Two the light waves, namely, the pump wave and the expedient which analyzes the frequency difference between the Stokes waves (40) with, it includes. As for this sensor, it is possible to use especially, as the hydrophone.
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