赤外線ニ次元ロックインアンプによる高分子材内部の欠陥検出 [in Japanese] Detecting Defects in Polymer Plates by using an Infrared 2-D Lock-in Amplifier System [in Japanese]
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We have developed a two-dimensional lock-in amplifier system which can detect very small changes in images and can be used to detect subsurface defects in polymer plates nondestructively. This system uses modulated lights to heat and to cool the polymer surfaces. If there is a defect in the subsurface, heat conduction is disturbed at the edges of the defect. The subsurface defect should be identified by the observation of the localized variant temperature variation region on the surface. The temperature distribution can be observed by using an infrared thermography, and the variation can be detected by using a two-dimensional lock-in amplifier system. This inexpensive measurement system should therefore be very useful in detecting small defects in various polymers, rapidly, nondestructively, and without any contact.
- The Journal of the Institute of Electrical Engineers of Japan
The Journal of the Institute of Electrical Engineers of Japan 117(12), 600-606, 1997-12-01
The Institute of Electrical Engineers of Japan