Development of Phased Array Ultrasonic Detection System Using a Post-Processing Technique

– Phased array ultrasonic is an advanced method of ultrasonic testing that has application in medical imaging and industrial nondestructive testing. Compared with single-element probes, a phased array probe can focus and swept the beam electronically without moving the probe. An ultrasonic testing system has been established using phased array probes and postprocessing technique. Processing of ultrasonic array data is traditionally based on having parallel transmission circuits that enable staggered firing of transmitter elements to produce the desired wavefront. This paper describes an approach in which the full matrix of time domain signals from every transmitter-receiver pair is captured and post-processed. An advanced processing algorithm is implemented which allows the array to be focused at every point in the target region. In addition, the experimental detecting process and system have been designed and the testing results of composite material part are presented which show the efficiency and feasibility of this ultrasonic detection system.