Patent ID: 9267878
Filing Date: 2016-02-23
CPC Classification: G01B,G01H,G01N

Claim Text:
1. An acoustic signal receiving apparatus comprising: a Fabry-Perot sensor including a Fabry-Perot interferometer configured to convert an acoustic wave generated from a measurement object to a light intensity signal; a first light source configured to emit light having a first wavelength, wherein the first wavelength is settable; a second light source configured to emit light having a second wavelength different from the first wavelength, wherein the second wavelength is settable; a detector configured to convert the light intensities of reflected rays of light obtained by irradiation of the Fabry-Perot sensor with rays of light from the first light source and the second light source into electric signals independently by the first wavelength and the second wavelength; and a processor configured to acquire a difference between an electric signal corresponding to the first wavelength and an electric signal corresponding to the second wavelength, wherein the first wavelength and the second wavelength are set so that differential values of reflectivity spectrum of the Fabry-Perot sensor are different at the first wavelength and the second wavelength.