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- since 1996 -

Materials Research Institute
Consulting to the NDT industry.

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Technical Discussions
Dipl-Ing. Christoph Müller
Consultant, Process Validation
Austria, Joined May 2001, 1

Dipl-Ing. Christoph Müller

Consultant, Process Validation
Austria,
Joined May 2001
1
05:23 May-09-2001
Bubble detection in high-viscous gel

We have the problem of air bubbles in a high-viscous gel used for in-vitro diagnostics. The gel is under pressure and flowing very slowly through a metallic pipe of about 30 mm in diameter.

Is there a possibility to detect these air bubbles with ultrasonic-equipment. Asking for help/contacts.

Christoph Müller


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

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
05:37 May-09-2001
Re: Bubble detection in high-viscous gel
: We have the problem of air bubbles in a high-viscous gel used for in-vitro diagnostics. The gel is under pressure and flowing very slowly through a metallic pipe of about 30 mm in diameter.
.
: Is there a possibility to detect these air bubbles with ultrasonic-equipment. Asking for help/contacts.

You didn't indicate the size of the bubbles, but assuming that they are on the order of one-half millimeter in diameter or larger, it should be possible to detect them with conventional ultrasinic equipment. However, assuming also that they may occur anywhere in the 30 mm diameter stream, it will be necessary to use a number of transducers and multiple instrumentation channels to comprehensively inspect 100% of the gel volume. So yes, your proposed test is probably possible with a multi-channel system.

The Panametrics affiliate in Austria is Panametrics Messtechnik GmbH. You will find a link to them on our home page at .

--Tom Nelligan



    
 
 
Dr. Patel
R & D, Consultant to Universities/Industries
Fallon Ultrasonics/McMaster University, Canada, Joined May 2001, 20

Dr. Patel

R & D, Consultant to Universities/Industries
Fallon Ultrasonics/McMaster University,
Canada,
Joined May 2001
20
06:10 May-09-2001
Re: Bubble detection in high-viscous gel
: We have the problem of air bubbles in a high-viscous gel used for in-vitro diagnostics. The gel is under pressure and flowing very slowly through a metallic pipe of about 30 mm in diameter.
.
: Is there a possibility to detect these air bubbles with ultrasonic-equipment. Asking for help/contacts.
.
: Christoph Müller
.We have sold the system to many univeristy where they are studying air bubbles and particles. The frequency selection is important. Yes they are measuring both the number of particles and also tracking the particles within the beam of transducer. The software comes with the system and some other group has also tried in latex materials. Thus, it is possible with single channel or dual channel system. One can measure the attenuation and velocity and second channel will measure the counts of particles within the selected region and track the particles. We need following information
1. What is the attenuation in the gel
2. The bubble size
3. This allow us to configure the system power and sensor frequency

Regards

Dr. Patel



    
 
 
^Wieslaw Bicz
^Wieslaw Bicz
07:13 May-09-2001
Re: Bubble detection in high-viscous gel
: We have the problem of air bubbles in a high-viscous gel used for in-vitro diagnostics. The gel is under pressure and flowing very slowly through a metallic pipe of about 30 mm in diameter.
.
: Is there a possibility to detect these air bubbles with ultrasonic-equipment. Asking for help/contacts.
.
: Christoph Müller
.
May be it would be better to remove this bubbles. In this case it would be possible to do it with ultrasound and it could be very effective.
If you are interested, we can help in implementing this solution.


    
 
 
jean paul van Cuyck
Director
A2MS, Applied Acoustics, Materials and Systems, France, Joined Nov 1998, 13

jean paul van Cuyck

Director
A2MS, Applied Acoustics, Materials and Systems,
France,
Joined Nov 1998
13
04:07 May-10-2001
Re: Bubble detection in high-viscous gel
: We have the problem of air bubbles in a high-viscous gel used for in-vitro diagnostics. The gel is under pressure and flowing very slowly through a metallic pipe of about 30 mm in diameter.
.
: Is there a possibility to detect these air bubbles with ultrasonic-equipment. Asking for help/contacts.
.
: Christoph Müller
.

Conceptually yes.

In fact the aim problem is to find the compromise between the buble size, frequency resolution and sound attenuation.
You can even try to use the buble resonance frequency. It depend on the medium and the viscosity.

I have worked on the sound propagation through particle cloud (buble, plankton, mineral particle).
I could help you if you need.


    
 
 

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