ULTRASONIC FLAW DETECTOR AND METHOD, AND IN-FURNACE STRUCTURE PRESERVATION METHOD

To provide an ultrasonic flaw detection technology with which, when reflecting an ultrasonic wave and having it reach a defect, it is possible to obtain highly reliable test results even when the reflection surface is uneven.SOLUTION: An ultrasonic flaw detector 10 comprises: a transmit/receive unit 11 for transmitting and receiving an ultrasonic wave U to and from each of a plurality of ultrasonic elements 31 arrayed in an array probe 30; a database 12 for holding the shape information 45 of an inspection object 40 a second face 42 of which is formed on a non-continuous plane; a computation unit 16 for computing a propagation time T on the basis of the shape information 45 till the ultrasonic wave U reaches a focus F after being reflected on the second face 42; a calculation unit 17 for calculating a difference between the propagation time T of the ultrasonic element 31 selected for a reference point C and the propagation time T of the other ultrasonic elements 31, as a delay time Δt; and a synthesizing unit 18 for adjusting the timing of transmission and/or reception of the ultrasonic wave U on the basis of the delay time Δt and synthesizing a plurality of echo waveforms 35 received by each ultrasonic element 31.SELECTED DRAWING: Figure 1 【課題】超音波を反射させて欠陥に到達させるに際し、反射面が連続平面でなくとも、信頼性の高い試験結果が得られる超音波探傷技術を提供する。【解決手段】超音波探傷装置１０は、アレイプローブ３０に配列する複数の超音波素子３１の各々に対し超音波Ｕを送信及び受信させる送受信部１１と、第２面４２が非連続平面で形成された被検査対象４０の形状情報４５を保持するデータベース１２と、超音波Ｕが第２面４２を反射して焦点Ｆに到達するまでの伝播時間Ｔを形状情報４５に基づいて演算する演算部１６と、基準点Ｃに選択された超音波素子３１の伝播時間Ｔとその他の超音波素子３１の伝播時間Ｔとの差分を遅延時間Δｔとして計算する計算部１７と、遅延時間Δｔに基づいて超音波Ｕの送信及び前記受信の少なくとも一方のタイミングを調整し各々の超音波素子３１で受信された複数のエコー波形３５を合成する合成部１８と、を備える。【選択図】図１