FLAW DETECTION DEVICE AND FLAW DETECTION METHOD

To highly accurately detect the presence of a flaw of a steel plate deck.SOLUTION: This flaw detection device comprises: a magnetic flux generation unit generating a magnetic flux on a steel plate deck; a magnetic sensor 140 measuring the intensity of a magnetic field generated in the steel plate deck; a distance sensor 150 measuring the distance between the sensor 150 and the surface of a pavement laminated on the steel plate deck; a transmission unit causing an electromagnetic wave from the surface of the pavement to enter the transmission unit; a reception unit receiving each of the reflected wave of S-polarized light and the reflected wave of P-polarized light which are based on the incident electromagnetic wave; a dielectric constant calculation unit 310 calculating the dielectric constant of the pavement on the basis of the received reflected waves of S-polarized light and P-polarized light; a thickness estimation unit 312 estimating the thickness of the pavement on the basis of the calculated dielectric constant; and a correction unit 320 correcting the intensity of the magnetic field measured by the magnetic sensor, on the basis of the distance measured by the distance sensor and the estimated thickness of the pavement.SELECTED DRAWING: Figure 5 【課題】鋼床版のきずの有無を高精度に検出する。【解決手段】探傷装置は、鋼床版に磁束を生成する磁束生成部と、鋼床版において生じる磁場の強さを測定する磁気センサ１４０と、鋼床版に積層された舗装体の表面との間の距離を測定する距離センサ１５０と、舗装体の表面から電磁波を入射させる送信部と、入射された電磁波に基づく、Ｓ偏光の反射波およびＰ偏光の反射波をそれぞれ受信する受信部と、受信されたＳ偏光の反射波およびＰ偏光の反射波に基づき、舗装体の比誘電率を算出する比誘電率算出部３１０と、算出された比誘電率に基づき、舗装体の厚みを推定する厚み推定部３１２と、距離センサによって測定された距離、および、推定された舗装体の厚みに基づいて、磁気センサによって測定された磁場の強さを補正する補正部３２０と、を備える。【選択図】図５