Internal rotary inspection system (IRIS) is an ultrasonic method for the nondestructive testing of pipes and tubes.
The ultrasonic beam allows detection of metal loss from the inside and outside of the tube wall.
The IRIS probe consists of a rotating mirror that directs the ultrasonic beam into the tube wall.
As the probe is pulled the spinning motion of the mirror results in a helical scan path.
One of the key settings in the procedure is to ensure that the ultrasonic pulse initiates in the very focus point at the center of the tube or pipe.