Great video. In my experience, while doing hot UTT it's often very difficult to get one good back wall signal and alot of times impossible to get 2. Obviously echo to echo at that point is not possible. I have used a preamp to improve the signal quality with good results.
Thanks Pete. Not only are you trying to overcome the issues of a corroded backwall, in steel, as the temperature increases the attenuation increases and the reduced velocity brings your wavelength closer to the grain size increasing scattering. To overcome this we implement both high sensitivity in the probe using a unique high temp piezo crystal (akin to the pre-amp), and offer a range of frequencies to get the best compromise when things get tough.
I think a neat idea would be to pose the question via OpenSourceNDT or NDT.net. The increased visibility of those sites will help in finding a solution. You could also make a short video explaining the problem.
Thank you , more information in less time ,, any advice about recommended probe to measure the thickness of high temperature for ( small pipes ,1",0.5",
It depends on how high the temperature is. Perhaps Ionix makes a dual one with a smaller tip, but Olympus has single element transducers that you can add high temperature delay lines to.
That transducer gives beautiful signal compared to a Olympus D790 coupled with the Olympus 38 DL Plus meter. What are your thoughts on that meter? I love your channel it is simplicity of theory and principles at it's core!
I think if you are doing simple thickness readings, then the 38DLP and a D790 is hard to beat. When things get more complex, you may wish to be able to easily adjust gates and other settings which are more inline with a full flaw detector.
We make sure to test compatibility with a wide range of gauges with our probes, including the 38DL. Our latest probes are impedance matched well to the gauge and can offer 10dB+ sensitivity over other transducers, ideal for high temperatures or other difficult inspections.
I’d be curious how far out first echo is with the cal block heated on the plate to see what that error is ? We scan using the block on the pipe/vessel whatever for 15 minutes to normalize.
Me too. I was thinking of doing another video later about the hazards of using 1st BWE vs E-E for high temp readings. I was going to park the probe on something that was slowly heated up and then plot the two and see the difference. Too many videos, not enough time!
@@hollowayndtengineeringinc.5201 Interesting. Probes have a duty cycle including high temp transducers. I have proven plenty as the transducer/probe heats up (left on the surface) your thickness reading goes up. Doesn’t take long. I’m not an echo to echo guy. I can see the validity. I just found your channel. I like it. Clearly you’re very knowledgeable. I feel given the amount of scanning out in the world. The few micron thickness of most paints or coatings is negligible especially with most dual transfucers
would be nice if you could show 1 % of what is added to every 55 Celsius. 100c to 300C = 200 Cdifference (200divided by 55C= 3.6 does that mean that for 200C you compensate 3.6% of the initial 100? mean at 100C= 9.4mm at 300c (9.4mm X3.6% )= 0,34mm mean 9.4mm adding 0.34mm = at 300C the measurment after compensation will be = 9.74mm?? i am level 1 and you should keep in mind that your audience is composed of all different level. tanks
Great video. In my experience, while doing hot UTT it's often very difficult to get one good back wall signal and alot of times impossible to get 2. Obviously echo to echo at that point is not possible. I have used a preamp to improve the signal quality with good results.
Agreed. E-E is ideal but won't work with the combination of high temperatures, thick material, and an irregular pitted internal surface.
Thanks Pete. Not only are you trying to overcome the issues of a corroded backwall, in steel, as the temperature increases the attenuation increases and the reduced velocity brings your wavelength closer to the grain size increasing scattering. To overcome this we implement both high sensitivity in the probe using a unique high temp piezo crystal (akin to the pre-amp), and offer a range of frequencies to get the best compromise when things get tough.
Hey I really appreciate your videos ( I have already seen all your videos) thank you so much for your explanation
AMAZING DEAR
Hi! Your videos are fun to watch and very informative. Btw, could you make a video on the DAC curve?
I made one on TCG, will that work for you or was there something else that you'd like me to cover?
Awesome video! Thank you! Love the BBQ too! My nerd brain is celebrating this knowledge. You deserve a nice delicious steak this BBQ season ^_^
I Thickness measured on stream steam like to day ... absolute nightmare ! We had sonatest HT couplant and HT probe... any advice appreciated
I think a neat idea would be to pose the question via OpenSourceNDT or NDT.net. The increased visibility of those sites will help in finding a solution. You could also make a short video explaining the problem.
Thank you , more information in less time ,, any advice about recommended probe to measure the thickness of high temperature for ( small pipes ,1",0.5",
It depends on how high the temperature is. Perhaps Ionix makes a dual one with a smaller tip, but Olympus has single element transducers that you can add high temperature delay lines to.
Is UT can be done for measuring thickness of fiber reinforced plastic FRP
I've never done it, but I'm sure it can
That transducer gives beautiful signal compared to a Olympus D790 coupled with the Olympus 38 DL Plus meter. What are your thoughts on that meter? I love your channel it is simplicity of theory and principles at it's core!
I think if you are doing simple thickness readings, then the 38DLP and a D790 is hard to beat. When things get more complex, you may wish to be able to easily adjust gates and other settings which are more inline with a full flaw detector.
We make sure to test compatibility with a wide range of gauges with our probes, including the 38DL. Our latest probes are impedance matched well to the gauge and can offer 10dB+ sensitivity over other transducers, ideal for high temperatures or other difficult inspections.
How to get this instrument
In first back wall method did you use compensation? Still coming big?
I’d be curious how far out first echo is with the cal block heated on the plate to see what that error is ? We scan using the block on the pipe/vessel whatever for 15 minutes to normalize.
Me too. I was thinking of doing another video later about the hazards of using 1st BWE vs E-E for high temp readings. I was going to park the probe on something that was slowly heated up and then plot the two and see the difference. Too many videos, not enough time!
@@hollowayndtengineeringinc.5201 Interesting. Probes have a duty cycle including high temp transducers.
I have proven plenty as the transducer/probe heats up (left on the surface) your thickness reading goes up. Doesn’t take long.
I’m not an echo to echo guy. I can see the validity.
I just found your channel. I like it. Clearly you’re very knowledgeable.
I feel given the amount of scanning out in the world. The few micron thickness of most paints or coatings is negligible especially with most dual transfucers
would be nice if you could show 1 % of what is added to every 55 Celsius. 100c to 300C = 200 Cdifference (200divided by 55C= 3.6 does that mean that for 200C you compensate 3.6% of the initial 100? mean at 100C= 9.4mm at 300c (9.4mm X3.6% )= 0,34mm mean 9.4mm adding 0.34mm = at 300C the measurment after compensation will be = 9.74mm??
i am level 1 and you should keep in mind that your audience is composed of all different level. tanks