Abstract
In order to minimise adhesion problems in the production process of laminated wood products, there is a need for a non-destructive test method that can provide a continuous control of the process and the product. This study compares the performance of pulse, heating-up and lock-in thermography. The results show that whenever inspection time not is a limiting factor, lock-in thermography should be used. Pulse thermography is on the other hand 10 times faster within its penetration depth of 1.0 mm. However, pulse thermography has 10 times lower signal-to-noise ratio than lock-in thermography. Heating-up thermography is an alternative to pulse thermography.
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