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- since 1996 -

Phoenix Inspection Systems Limited
Design and manufacture ultrasonic Transducers, Scanners and Custom Solutions for NDT inspections. Innovators in NDT technology

Technical Discussions
Phanindra Kumar
Phanindra Kumar
06:31 Mar-02-2010
Intial pulse in UT instrument

Dear all,

i'm using two UT instruments. The older equipment is giving good intial pulse even at 10mm Range. But the new equipment which i got recently, that is not giving intial pulse at 10mm range. All the parameter settings are same with the comparision of older instrument. But the old instrument is giving good intial pulse. Where as the new instrument is giving multiple echoes instead of intial pulse.

Can anybody explain the reason behind it. Sorry for not revealing the Instrument's NAME.

Please clarify.

Other, Retired ex Laboratory Technical Manager
OMECO Research Centre, Italy, Joined Sep 2008, 273


Other, Retired ex Laboratory Technical Manager
OMECO Research Centre,
Joined Sep 2008
21:05 Mar-02-2010
Re: Intial pulse in UT instrument
In Reply to Phanindra Kumar at 06:31 Mar-02-2010 (Opening).

if the probe is the same the second instrument is broken or wrong used (my opinion)

Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 825

Michel Couture

NDT Inspector,
Joined Sep 2006
04:08 Mar-03-2010
Re: Intial pulse in UT instrument
In Reply to ezio at 21:05 Mar-02-2010 .


It is a little difficult to make a proper diagnostic regarding your new instruement since you do not divulge the make of this new UT set and the old one as well. But one thing that comes to mind with this new instrument is the possibility of the PRF (pulse repetition rate) being too high. If this is the situation, you will have multiple false echo on your screen resulting from the interference of the sound pulse going into the part with the previous one coming back to your transducer.

If yor PRF is adjustable, try adjusting it to about 400 or if it is a Low - Medium - High type selection, try lowering it to a medium setting. With a static inspection, the PRF doesn't need to be very high.

Other thing you are not mentioning either is the frequency and probe size. This may also have an effect on your IP. Change your probe and see if your results are different between the instruments. Like Ezio said, it maybe your probe. This would eliminate it.


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