New process to catch wood-work glitches

August 5th, 2011 - 4:17 pm ICT by IANS  

London, Aug 5 (IANS) Now production defects in wooden items like pianos and tables, that cannot be spotted with the naked eye, can easily be noticed with the help of a new technology developed by a group of German researchers.

Research scientists from the Fraunhofer Institute use high-power ultrasound thermography.

It can detect longitudinal and transverse cracks, gluing errors, delaminations and black knots, according to a Fraunhofer statement.

The wooden article is vibrated with a sonotrode or ultrasound agitator, at a frequency of 20 kHz - in other words, 20,000 times a second.

Where there are defects, the different parts of the material rub against each other and produce heat. This heat at the defect’s extremities is picked up by a thermal imaging camera connected to a monitor which can enable one to spot the blots.

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