METHOD AND APPARATUS FOR PROCESSING SIGNALS OF ULTRASONIC FLAW DETECTOR.

摘要

A detector for detecting flaws in object (2) to be inspected in accordance with echo signals (b) from the object (2). Only in a specific period (TM) of measurement in a pulse interval (T0) of ultrasonic wave pulses (a), high frequency echo signals (b) outputted from a ultrasonic wave transceiver unit (1) are A/D converted at a high sampling frequency (fS), and provisionally stored in a storage (12). The sampling data are read out at a read-out frequency (f R) which is lower than the sampling frequency (fS). Only the data in this measurement period (TM) is subjected to digital signal processing to reduce noises by use of a digital filter (18) and a synchronous adding and averaging circuit (27). As a result, the noises contained in the echo signals (b) are significantly reduced while maintaining the on-line flaw detection. <IMAGE>