Ms. Yuxia Duan Profile

Yuxia Duan

at Beihang Univ

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Proceedings Article | 5 August 2009 Paper

Method and apparatus for enhancing surface absorption and emissivity in optical pulsed infrared nondestructive evaluation

Yuxia Duan, Cunlin Zhang, Wanping Jin, Naiming Wu

Proceedings Volume 7383, 73831G (2009) https://doi.org/10.1117/12.836266

KEYWORDS: Thermography, Infrared radiation, Absorption, Nondestructive evaluation, Inspection, Infrared cameras, Aluminum, Coating, Visible radiation, Metals

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In the application of optical pulsed infrared NDE, the visible light absorption and IR emissivity of the detected object must be considered. One of the simple methods is spraying paint on the highly reflective and low IR emissivity surface before testing. However, for some materials such as with pore space in the surface or easily to be corrupted have to be pretreated by other method and apparatus. Two kinds of apparatus for surface pretreating are designed according to the dimension of the detected object and the testing conditions. One apparatus is independent of the former detecting system, and the other is an improvement of the former system. The basic principle of the two apparatus is covering a flexible membrane of high light absorption and IR emissivity on the specimen surface by vacuum pumping. The paper also present the applications of the method, including the detection of the metal mesh material and the honeycomb structures with aluminum coating. The experimental results show that the technique of covering thin film by vacuum pump is effective for enhancing surface absorption and emissivity; moreover, it does not pollute or damage the sample. The application of the technique has practical significance, because it extends the scope of the application of the optical pulsed thermography nondestructive evaluation.

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