FLAW DETECTION DEVICE

• Main Authors: TSUKADA KEIJI, SETOGUCHI YUSUKE, HATO MASAHIRO, OHASHI TAKERU, HATANAKA HIROAKI, KITAMURA TOSHIYA
• Format: Patent
• Language: English; Japanese
• Published: 08.03.2023
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

To detect a flaw in a steel plate deck from a pavement body side.SOLUTION: A flaw detection device 100 comprises: excitation coils (first excitation coil 132a, second excitation coil 132b); an excitation unit 210 that applies, to the excitation coils, AC current with a first frequency and AC current with a second frequency that is a frequency lower than the first frequency to generate induction current in a steel plate deck through electromagnetic induction; a detection unit 230 that detects a detection signal based on the induction current; and a depth estimation unit 268 that estimates the depth of a flaw formed in the steel plate deck on the basis of a first frequency detection signal based on the induction current according to the AC current with the first frequency and a second frequency detection signal based on the induction current according to the AC current with the second frequency.SELECTED DRAWING: Figure 8 【課題】鋼床版のきずを舗装体側から検出する。【解決手段】探傷装置１００は、励磁コイル（第１励磁コイル１３２ａ、第２励磁コイル１３２ｂ）と、第１周波数の交流電流と、第１周波数よりも低周波数の第２周波数の交流電流とを励磁コイルに印加し、電磁誘導により鋼床版に誘導電流を発生させる励磁部２１０と、誘導電流に基づく検出信号を検出する検出部２３０と、第１周波数の交流電流に応じた誘導電流に基づく第１周波数検出信号と、第２周波数の交流電流に応じた誘導電流に基づく第２周波数検出信号とに基づいて、鋼床版に形成されたきずの深さを推定する深さ推定部２６８と、を備える。【選択図】図８