Technological lasers are a useful tool for laser welding as well as other material treatment and production processes. Lasers with an optical scanning head are the important group of technological lasers. A protection glass of the scanning heads can be contaminated during technological operations. This results in properties change and degradation of the glass and subsequent production quality reduction. Active thermography is one of the methods, which can be used for the protection glass inspection. The method uses external thermal excitation of the glass and detection of its response by an infrared camera. Experiments performed showed that a pollution of the protection glass can be inspected using flash-pulse thermography. Experimental set-up for the flash-pulse thermographic testing and results of tested samples inspections are presented in the contribution. Possibilities, advantages or disadvantages and possible development of the thermographic inspection of laser scanning heads protection glasses are discussed.Keywords: laser beam welding, active thermography, inspection, infrared testing, protective glass
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