F-1110 ロックインサーモグラフィによる欠陥深さの定量計測に関する実験的検討(J25-3 欠陥・き裂)(J25 機械力学,材料力学,エンジン関連の計測技術)

概要

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A quantitative nondestructive testing technique for determination of defect depth was developed based on the lock-in measurement of the surface temperature under the application of periodical xenon light heating. Experimental study was made on the applicability to the detection of flat bottom hole defects. Xenon light beam was periodically chopped by the electric shutter to generate out-of-plane heat flow in the objective body. Phase delay images were taken by the lock-in thermography, synchronized to the reference signal of the electric shutter operation. It was found that the location and size of the defects can be identified by the localized contrast change in the phase delay images. The relationship between the values of phase delay and heating period was examined for several defect depths and several heating periods. It was found that the phase delay curve for certain defect depth shows the peak of the contrast in phase delay image at certain heating period and the depth of the defects can be estimated from this relationship.
一般社団法人日本機械学会の論文
2001-08-22