Noncontact ultrasonic excitation thermography inspection technique

Ning Tao; Zhi Zeng; Lichun Feng; Dapeng Chen; Yue Li; Cunlin Zhang

doi:10.1117/12.880769

15 November 2010 Noncontact ultrasonic excitation thermography inspection technique

Ning Tao, Zhi Zeng, Lichun Feng, Dapeng Chen, Yue Li, Cunlin Zhang

Proceedings Volume 7854, Infrared, Millimeter Wave, and Terahertz Technologies; 78543S (2010) https://doi.org/10.1117/12.880769
Event: Photonics Asia 2010, 2010, Beijing, China

Abstract

Conventional ultrasonic thermography (thermosonic or sonic infrared imaging) is a technique in which acoustic energy is coupled to the structure by means of an acoustic transducer in contact with the sample, the captured temperature at the defect areas by an infrared camera is relatively higher than that of the surrounding area. The primary problem of this technique is that the acoustic horn must be mechanically in contact against the tested sample with an applied force. Therefore, the potential for damaging the structure especially for the filmy, brittle and fragile structure can't be ignored. In this paper, a new NDE technique based on a non-contact ultrasonic excitation thermography has been presented. The technique utilizes a redesigned ultrasonic horn to excite the sample in a non-contact fashion, and an infrared camera to monitor the variation of the surface temperature. The presented experimental results show that the non-contact ultrasonic excitation thermography has some potential in NDE application.

Citation Download Citation

Ning Tao, Zhi Zeng, Lichun Feng, Dapeng Chen, Yue Li, and Cunlin Zhang "Noncontact ultrasonic excitation thermography inspection technique", Proc. SPIE 7854, Infrared, Millimeter Wave, and Terahertz Technologies, 78543S (15 November 2010); https://doi.org/10.1117/12.880769

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