Abstract
Tile is water-proof, beautiful and useful materials, but it has fatal problem that it may be peeling off. So, skillful workers often have to make hammering tests for all tiles. From experimental study, it could be found that such a tile was vibratory in frequency range from 1 kHz to 2 kHz. Based on the result, author proposed a new detecting method that is feedback circuit using twin piezo-electric buzzers, for touching to a tile, and as for input and output. It could oscillate and radiate a sound only when touched to a tile in peeling off.
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