NONDESTRUCTIVE INSPECTION DEVICE, METHOD AND PROGRAM

To provide a nondestructive inspection technology capable of easily detecting an internal flaw of a resin coating part by an ultrasonic wave flaw detection test.SOLUTION: A nondestructive inspection device 10 includes: a transmission unit 17 that oscillates an oscillator 25 provided in a probe 27 to transmit an ultrasonic beam 26; a reception unit 18 that receives an echo waveform 20 of the ultrasonic beam 26 made incident to a resin layer 30 coated on a regular uneven structure 31; a first authentication unit 11 that authenticates, as first reference signals 21, those derived from an incidence surface 32 of the resin layer 30, of the echo waveforms 20; a second authentication unit 12 that authenticates, as second reference signals 22 derived from the uneven structure 31, those being at a depth position common to each other in the resin layer 30 and regularly received in a surface direction, of the echo waveforms 20; and an extraction unit 13 that extracts, as a flaw signals 23, those received in a beam path length 28 held between the first reference signal 21 and the second reference signal 22, of the echo waveforms 20.SELECTED DRAWING: Figure 1 【課題】超音波探傷試験により、樹脂コーティング部の内部欠陥を簡便に検出することができる非破壊検査技術を提供する。【解決手段】非破壊検査装置１０は、プローブ２７に設けられた振動子２５を発振させ超音波ビーム２６を送信させる送信部１７と、規則的な凹凸構造３１にコーティングされた樹脂層３０に入射させた超音波ビーム２６のエコー波形２０を受信する受信部１８と、エコー波形２０のうち樹脂層３０の入射面３２に由来するものを第１基準信号２１に認定する第１認定部１１と、エコー波形２０のうち樹脂層３０の深さ位置が共通し面方向において規則的に受信されたものを凹凸構造３１に由来する第２基準信号２２に認定する第２認定部１２と、エコー波形２０のうち第１基準信号２１から第２基準信号２２に挟まれるビーム路程２８で受信されたものを欠陥信号２３として抽出する抽出部１３と、を備える。【選択図】図１