Tuesday, September 14, 2010

Another NDT technology

My last post addressed the advantage of eddy current for crack detection. It does have a couple of limitations though. The crack must be surface-breaking, or very near, and the material under inspection needs to be ferrous. So what if you need to look for flaws deeper under the surface?

Well the conventional options would be x-ray (expensive and raises safety concerns,) and ultrasound. Historically, ultrasound has been a single point pulse-echo technology, and so had to be scanned across a surface, making it slow. But I’m here to tell you that things are changing!

The new trend in ultrasound is the phased array. This “ … provides better imaging, higher repeatability and reproducibility and more angles and scan patterns over conventional ultrasonic methods.” That quote comes from “
How Ultrasonic Phased Array is Shaping the Industry,” published on the NDTmag website July 28th, 2010. If you need to find flaws beneath a surface, this is something you ought to read.

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