Detecting Longitudinal Position of Internal Log Hole Using an Impact-Echo Method

Detecting Longitudinal Position of Internal Log Hole Using an Impact-Echo Method

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This paper presents a new methodology for detecting the longitudinal location of the hidden hole in a log using impact-echo testing.The hole and the end surface of the log produced two different amplitude peaks in the frequency spectrum after a mechanical tap on the top of the log.The ratio of the two frequencies was used to estimate the longitudinal position of the hole.

The major advantage PLATINUM COLLAGEN B of this method is that it avoids measuring the travel velocity of the Pencil Case stress wave, which is sensitive to many factors and then poses a formidable challenge to the realization of inspection.Experimental studies were carried out using Pine logs with mechanically drilled holes and a Cinnamomum camphora log with natural hole.The results indicated that the estimated positions were in good agreement with the actual position of the hole.

The impact-echo testing can be applied to detect the longitudinal position of the internal hole in log.