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

Yuxia Duan; Cunlin Zhang; Wanping Jin; Naiming Wu

doi:10.1117/12.836266

4 August 2009 Method and apparatus for enhancing surface absorption and emissivity in optical pulsed infrared nondestructive evaluation

Yuxia Duan, Cunlin Zhang, Wanping Jin, Naiming Wu

Author Affiliations +

Proceedings Volume 7383, International Symposium on Photoelectronic Detection and Imaging 2009: Advances in Infrared Imaging and Applications; 73831G (2009) https://doi.org/10.1117/12.836266
Event: International Symposium on Photoelectronic Detection and Imaging 2009, 2009, Beijing, China

Abstract

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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Yuxia Duan, Cunlin Zhang, Wanping Jin, and Naiming Wu "Method and apparatus for enhancing surface absorption and emissivity in optical pulsed infrared nondestructive evaluation", Proc. SPIE 7383, International Symposium on Photoelectronic Detection and Imaging 2009: Advances in Infrared Imaging and Applications, 73831G (4 August 2009); https://doi.org/10.1117/12.836266

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KEYWORDS

Thermography

Infrared radiation

Absorption

Inspection

Nondestructive evaluation

Infrared cameras

Aluminum

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