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- since 1996 -

Sonotron NDT
Original developer and manufacturer of advanced ultrasonic instruments
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Technical Discussions
langtuteng
Armenia, Joined Nov 2014, 196

langtuteng

Armenia,
Joined Nov 2014
196
13:56 Sep-23-2015
how to determine a UT probe is broken

dear sir, does anyone kown what phenomens can prove a UT probe is broken? someone told me to measure the frequency of the probe, other told me to measure the resolution of the probe. which one is right? Do you kown any specificaiton relate to it?

1
 
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TomNelligan
Engineering,
retired, USA, Joined Nov 1998, 390

TomNelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
16:21 Sep-23-2015
Re: how to determine a UT probe is broken
In Reply to langtuteng at 13:56 Sep-23-2015 (Opening).

When an ultrasonic transducer fails, you will normally see a loss of sensitivity, an increase in ringing, or both. The frequency is determined by probe design (the type and thickness of the piezoelectric element, the type of damping material used, and the tuning network if one is used). Bandwidth can potentially change in the case of a backing disbond (usually caused by overheating), but that is uncommon.

The best way to verify whether your probe is working properly is to check its performance on an appropriate test block or reference sample. Some inspection codes designate a specific probe verification test based on reference holes or notches.

2
 
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John Norman
Consultant, owner of business
NTS Ultrasonics Pty Ltd, Australia, Joined Oct 2012, 116

John Norman

Consultant, owner of business
NTS Ultrasonics Pty Ltd,
Australia,
Joined Oct 2012
116
02:06 Sep-24-2015
Re: how to determine a UT probe is broken
In Reply to langtuteng at 13:56 Sep-23-2015 (Opening).

Sometimes visual inspection of the probe can help. For example, if the transducer is an immersion transducer and you see bumps in the wave plate, this is an indication that it is separating from the piezo element. Cracks in the wave plate indicate damage. Some transducers have transparent or translucent wave plates and you might see cracking in the piezo element.

Comparing the performance of a transducer with another of the same type can be useful. I have noticed with some transducers that have been dropped onto hard floors that the echo from a test piece becomes distorted to some extent. A standard calibration procedure using a test block should show this.

If you ever use paintbrush style transducers you should be especially careful. I did work for a client a few year ago who uses a lot of paintbrush transducers. Most seemed to be working OK, but beam plots showed very lopsided beams, indicating damage.

1
 
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