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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