METHOD OF PROCESSING PHASED ARRAY APERTURE SYNTHESIS AND METHOD OF EVALUATING APPLICATION EFFECT THEREOF

摘要

PPROBLEM TO BE SOLVED: To select a probe having a frequency/vibrator size suitable to enhance bearing resolution by a method of aperture synthesis according to the position of a defect assumed to exist in an inspecting object. PSOLUTION: Based on an evaluation expression which is expression 1, an improvement effect on bearing resolution by the method of aperture synthesis is evaluated using a relation to a predicted distance from a probe to a flaw, and from a vibrator frequency and vibrator size of a phased array. It is evaluated whether or not to apply aperture synthesis processing. A used frequency is determined based on the material of the inspecting object. A maximum vibrator size is selected by using the used frequency and the predicted distance from the probe to the flaw. Within such a range, the number of elements used as transmission elements of the phased array is set at a maximum value. In the expression 1: f is a frequency; l is a vibrator size; c is sound velocity; and r is a distance from the probe enhancing bearing resolution. PCOPYRIGHT: (C)2011,JPO&INPIT