Internal Rotary Inspection (IRIS)
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operation of IRIS
operation of IRIS
operation of IRIS
The IRIS probe consists of a rotating mirror that directs the ultrasonic beam into the tube wall. The mirror is driven by a small turbine that is rotated by the pressure of water being pumped in. 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. An off-center pulse will show a distorted image of the tube due to the difference in the sound path for either side of the tube wall. For that reason there are centering devices that help the operator to keep the turbine centered at all times.
The transducer utilized for the inspection has to be high frequency, high enough to bounce back at both the inner wall and the outer wall. The frequency range typically used for the piezoelectric transducer is from 10-25 MHz.- 0 Replies
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