Abstract
This paper describes a method to estimate the position of a crack in a concrete block using many sensors. An array of sensors is attached on the concrete block, and a vibration pulse is forced by using a small hammer. If there is a crack, a reflection wave is generated from the position of the crack. Therefore, conventional methods to estimate the position of the sound source seem to be useful for this purpose. However, since the concrete block is elastic, there are several vibration modes, and the position of a crack cannot be estimated by the conventional methods. Therefore, a new method is proposed to estimate the position of a crack in an elastic block. This is achieved by designing a FIR filter for each sensor output so that the summation signal of the outputs of the FIR filters has zero for useless vibration modes. Some experiments were carried out, and good results were obtained.
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