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Technical Discussions
Sergio Antonio Jensen
NDT Inspector
Brazil, Joined Feb 2000, 6

Sergio Antonio Jensen

NDT Inspector
Brazil,
Joined Feb 2000
6
03:02 Nov-06-2006
USM 35 portable ultrasonic flaw detector

We have a USM 35 portable ultrasonic flaw detector, and we felt a little delay between sound emition and receivement by the detector.

Has anyone else reported something like that?

Best Regards,




    
 
 Reply 
 
Mark Potter
Mark Potter
05:03 Nov-06-2006
Re: USM 35 portable ultrasonic flaw detector
What sort of transducer were you using? This effect has been known to occur in the case of an inductive load on the flaw detector (e. g. an EMAT) with many flaw detectors.

Mark.


    
 
 Reply 
 
David
David
00:06 Nov-07-2006
Re: USM 35 portable ultrasonic flaw detector
----------- Start Original Message -----------
: We have a USM 35 portable ultrasonic flaw detector, and we felt a little delay between sound emition and receivement by the detector.
: Has anyone else reported something like that?
: Best Regards,
------------ End Original Message ------------

Do you mean the signals on the screen seem to lag behind the probe movements?

This is pretty common with digital instruments and the USM35 is much better than some of the earlier instruments.

If you want to use the features and convenience of an advanced digital unit you just have to slow down a little on your scanning. You soon get used to it. I doubt they will ever be as responsive as a CRT screen.

Whether it's the screen display that's slow or the processor doing it's calculations I don't know. Maybe the manufacturers could comment?


    
 
 Reply 
 
Sergio Antonio Jensen
NDT Inspector
Brazil, Joined Feb 2000, 6

Sergio Antonio Jensen

NDT Inspector
Brazil,
Joined Feb 2000
6
04:08 Nov-07-2006
Re: USM 35 portable ultrasonic flaw detector
----------- Start Original Message -----------
: What sort of transducer were you using? This effect has been known to occur in the case of an inductive load on the flaw detector (e. g. an EMAT) with many flaw detectors.
: Mark.
------------ End Original Message ------------

Thanks for the help, Mark

We usually use the superficial MWB90n2 probe. I've not personally seen this delay, but my colleagues felt this problem.

Do you consider this delay aceptable?


    
 
 Reply 
 
Mark Potter
Mark Potter
00:35 Nov-13-2006
Re: USM 35 portable ultrasonic flaw detector
----------- Start Original Message -----------
: Thanks for the help, Mark
: We usually use the superficial MWB90n2 probe. I've not personally seen this delay, but my colleagues felt this problem.
: Do you consider this delay aceptable?
------------ End Original Message ------------

That depends on how long the delay is compared with the transit time of the ultrasound, and also wether you are able to look at the time difference between multiple echoes (which would allow you to cancel out the delay)

Mark.


    
 
 Reply 
 

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