A sensor has been developed and tested thar is capable of emitting and
receiving ultrasonic energy at temperatures exceeding 900 degrees C a
nd pressures above 150 MPa. The sensor works with standard ultrasonic
pulser-receivers and has demonstrated the capability of measuring work
piece deformation during hot isostatic pressing. Details of the sensor
design, performance, and coupling of the ultrasound to the workpiece
are described. Ultrasonic data acquired by the sensor in-situ during h
ot-isostatic-pressing runs are presented.