超音波パルスの反射波形を利用した物体形状の識別に関する研究

概要

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In this paper an object shape recognizing method which utilizes the information of a reflected ultrasonic pulse waveform is proposed. An electric spark discharge is employed as a non-directional point sound source. As for some simple shaped objects, theoretical and experimental waveforms coincide well with each other and it is proved that each waveform has characteristics based on the surface shape of the object. Four pairs of six type objects, which include several complicated shape objects, are adopted. An experiment of recognizing one among the six is carried out by using a pattern matching method. As the template for the pattern matching, both a power spectrum in frequency domain and a waveform in time domain are adopted and tested. The probability of recognition is better than 95 % for the former and 98% for the latter, and it is proved experimentally that the information of a reflected ultrasonic pulse waveform in time domain is effective enough for the object shape recognition. It is also proved experimentally that this recognizing method can cope with the change of the orientation and the distance of an object, provided that the templates corresponding to the orientation and the distance are prepared in advance.
公益社団法人精密工学会の論文
2000-05-05