Patent ID: 7719689
Filing Date: 2010-05-18
Classification: G01L,G01M,G01N

Abstract:
1. An AE/ultrasound detection system comprising: a broadband light source for emitting broadband-wavelength light; an FBG sensor that is attached to an object-to-be-inspected and that the broadband-wavelength light enters; light dividing means that divides the reflected light or transmitted light from the FBG sensor so as to produce a first reflected light or transmitted light and a second reflected light or transmitted light; a first filter having periodic transmission characteristics for transmitting part of the first reflected light or transmitted light; a second filter having periodic transmission characteristics and having the transmittance peak wavelength separated from that of the first filter by FSR/4, for transmitting part of the second reflected light or transmitted light wherein FSR, Free Spectral Range, refers to the spacing in optical wavelength between two successive reflected or transmitted optical intensity maxima or minima of an interferometer or diffractive optical element; and photoelectric conversion means for converting the intensity of the transmitted light from each of the first and second filters into an electric signal.