Modernizing the Echo Method of Ultrasonic Flaw Detection.

WE consider a modernization of the echo method of ultrasonic flaw detection that uses one or several receiving transducers on the object's lateral surface in addition to the array of transducers contacting with the working (front) surface of the object. This method of array arranging can substantially improve the resolution and, in the case of using an antenna array on the lateral surface of the object, obtain additional information for imaging the internal structure of the object. In order to obtain the potential resolution, an ultrawideband probing signal with a Gaussian envelope is used in combination with a novel signal processing algorithm that includes summation, one-sided clipping, and multiplication of recorded signals. Some practical recommendations are given in the paper. Potential resolution in various directions has been assessed. [ABSTRACT FROM AUTHOR]