#ndt An ultrasonic phased array system is described for online inspections of welds or condition monitoring of parent material at elevated temperatures of up to 350oC. Wedges are built from plastics resistant to high temperature degradation, and equipped with a cooling jacket around the array. A model of the ultrasonic beam skew pattern due to thermal gradients inside the wedge was developed. The model is used in a separate algorithm to calculate transmission and reception time delays on individual array element
Source: NDT