FLAW SIGNAL EXTRACTION CIRCUIT IN ULTRASONIC FLAW DETECTION APPARATUS

摘要

PURPOSE:To extract only a flaw signal, by removing a noise component from the output signal of an ultrasonic flaw detection apparatus. CONSTITUTION:Only the signal of set voltage or more in the output signal Bout from an ultrasonic flaw detection apparatus main body 6 passes an analogue switch 14 to be supplied to an A/D converter 5 to be converted to a digital signal which is, in turn, taken in a memory 16 but, when the number of times of the signal Bout continuously passing through th switch 14 is n-times short of a set value, (n) digital data taken in the memory are not regarded as the flaw data corresponding to a flaw and are erased. Therefore, a noise component can be effectively removed as compared with a case removing the noise component only by the magnitude of the signal Bout.