where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

Controle Mesure Systemes
Contrôle Mesure Systèmes (CMS) is a leader in Non Destructive Testing (NDT) with a complete range of products for eddy current and ultrasonic i ...
809 views
Technical Discussions
Fangjun Hong
Fangjun Hong
00:26 Sep-09-2002
How to detect the solid/liquid metal interface? (re-post)

I want to determine the postion of interface of liquid/solid alloy-158 metal. the attched is my experimental setup. I use Panamatrics 5900 pulser/reciver. I found out I canot detect the echo from the interface of liquid/solid metal, but the signal from the top of solid metal. because the maxium gain of 5900 pulser/receiver is 54db, so I am wondering whether the gain is not high enough to detect the singal. if I add a singal amplifier, could I detect the singal?
is the frequency of the transducer I used too high?
Could anyone give me suggestion on my experimental setup, for example, the selection of the transducer, puler/receiver, and etc.





 
 Reply 
 
Tom Nelligan
Engineering,
retired, USA, Joined Nov 1998, 390

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
03:24 Sep-09-2002
Re: How to detect the solid/liquid metal interface? (re-post)
The Panametrics Model 5900PR that you are using is not really designed for applications requiring very high sensitivity. Rather, that instrument is optimized for use with very high frequency transducers (50 MHz and higher)in applications where thin material resolution, rather than penetration, is most important.

Because it is optimized for very high frequency transducers, it is going to under-drive the 20 MHz transducer that you are using. You could probably pick up at least a factor of 3 in sensitivity by using a higher energy excitation pulse, which can be obtained from other Panametrics pulsers such as the Model 5800PR or Model 5072PR (as well as some instruments from other manufacturers).

It also occurs to me that since your sound path is fairly long, you could perhaps use a lower frequency transducer (10 MHz, even 5 MHz), whose signal would be less subject to attenuation in the liquid metal. You might also consider a larger diameter transducer if the interface between liquid and solid metal is rough or uneven; a larger diameter may be a little less sensitive to geometrical effects.

--Tom Nelligan
GE Panametrics


 
 Reply 
 
Fangjun Hong
Fangjun Hong
07:30 Sep-10-2002
Re: How to detect the solid/liquid metal interface? (re-post)
: The Panametrics Model 5900PR that you are using is not really designed for applications requiring very high sensitivity. Rather, that instrument is optimized for use with very high frequency transducers (50 MHz and higher)in applications where thin material resolution, rather than penetration, is most important.
.
: Because it is optimized for very high frequency transducers, it is going to under-drive the 20 MHz transducer that you are using. You could probably pick up at least a factor of 3 in sensitivity by using a higher energy excitation pulse, which can be obtained from other Panametrics pulsers such as the Model 5800PR or Model 5072PR (as well as some instruments from other manufacturers).
.
: It also occurs to me that since your sound path is fairly long, you could perhaps use a lower frequency transducer (10 MHz, even 5 MHz), whose signal would be less subject to attenuation in the liquid metal. You might also consider a larger diameter transducer if the interface between liquid and solid metal is rough or uneven; a larger diameter may be a little less sensitive to geometrical effects.
.
: --Tom Nelligan
: GE Panametrics
.
Dear Mr. Tom Nelligan,
Thanks for your suggestion.
I am wondering whether V112-RM 10MHz, 6mm Finger Contact Transducer and V110-RM 5MHz, 6mm is ok for my application.
I also want to use external pulser (Function & Arbitrary Waveform Generator) to excite the transducers with burst tone pulse and use 5900 Receiver to detect the signal. is that OK?
What should I pay attention to when I use external pulser, beside the power limit of the transducer?




 
 Reply 
 

Product Spotlight

Semi-Automated Phased Array Immersion System for Small Composite Parts

Turn-key semi-automated system as an improved and affordable solution for inspection of small comp
...
osite parts. Includes support table, immersion tank, scanner, PA instrument, PC, Analysis software, database, wedge management and other options.
>

FD800 Bench Top Flaw Detectors

The bench-top FD800 flaw detector range combines state-of-the-art flaw detection with advanced mater
...
ial thickness capabilities. Designed for use in the laboratory these gauges are the tool you need for all your flaw detecting needs.
>

NDTkit RT

NDTkit RT, TESTIA's Digital Radiography software The NDTkit product line software for X-ray analysi
...
s. NDTkit RT is a software benefiting from the Ultis kernel which is dedicated to radiographic image analysis. It offers a set of tools and filtering processes to assist RT operators in finding relevant flaws.
>

Eddy Current inspection : RotoETscan Rotating Head

The rotating head RotoETscan detects the presence of longitudinal surface or sub surface defects a
...
t high speed. The rotating head is often installed directly on the production line. It is generally dedicated to the control of long products such as tubes, bars and wires, made of ferrous or non-ferrous material. It can also be used for inspection of small parts (billets).
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window