A fast and economic circular scanning method to localize and evaluate holes inside round timber is presented. This method consists in measuring transit times of the ultrasonic wave by fixing the transmitter probe in the perimeter of the sample, then moving the receiver probe every ten degrees until completion of the circle. The scanning is done with a cheap and light instrument. Tests are made with clear wood samples. First, each sample is scanned by this method. Second, the process is repeated after drilling different holes in the samples. Results show that the method allows to quantify holes size and position in a fast and reliable way.

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