The advantages of the IRIS inspection technique include the following:
It is very accurate. Wall thickness measurements can be made, with the use of a 15MHz-focused transducer, to an accuracy of within 0.1mm.
It is a fairly sensitive technique. The sensitivity achieved will depend on tube dimensions and tube cleanliness. In general, it can be stated that, it should be possible to detect a 1.5mm defect in tubing up to 1 inch which has been properly cleaned.
Both ferromagnetic and non-ferromagnetic tubes can be inspected
A three dimensional picture of the defect is obtained, thus the defect profile and its depth is provided.
Interpretation of results is easier than in the other techniques assuming that reasonable tube cleanliness has been achieved.