Phased array ultrasonic testing produces real-time sectorial scans (S-Scans) that provide a full volumetric examination from a single inspection point. Phased array equipment can detect defects regardless of their orientation to the transducer.
Phased array ultrasonic testing can be used for:
- inspection of welds
- thickness measurements
- corrosion inspection
- crack detection.
Time of flight diffraction (TOFD) is an ultrasonic screening tool that can rapidly scan welds and produce very accurate measurements of any defects found.
TOFD operates using a pitch and catch technique with two probes on either side of a weld. One probe transmits a series of ultrasonic pulses and another receives them. If a crack or other defect is present in the weld, the ultrasonic waves will diffract and the time of flight between transmitter and receiver will be affected. Based on the change in time of flight, weld defects can be located and sized.