A Materials and Defect Simulator for Calibrating Ultrasonic Equipment Used in Nondestructive Testing or Inspection

摘要

An ultrasonic Electronic Test Block (ETB) has been devised for use in calibrating ultrasonic nondestructive tests and equipment. The ETB is similar to a transponder. A device sensitive to ultrasonic waves receives the acoustic signal emitted by any ultrasonic equipment. This received signal is then electronically processed and re-emitted in such manner as to appear to be an echo, as from a standard reference block. Both vertical and horizontal linearity on the cathode-ray-tube screen as well as resolution can be determined at the testing site, rather than in the laboratory as is presently necessary using standard reference blocks. The use of the ETB as a flaw size simulator is being further investigated; this use is feasible if the ETB can be used to measure the active area and the operating frequency of the acoustic signal, since the echo characteristics depend not only on the flaw parameters but also on the acoustic signal parameters. (Author)