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 -

KARL DEUTSCH
INSTRUMENTS AND SYSTEMS FOR NON-DESTRUCTIVE TESTING OF MATERIALS.

401 views
Technical Discussions
Peter Hammond
Peter Hammond
07:13 Sep-24-1996
High temperature probes

Hello,
I have a couple of questions arising from Klaus Matthies' paper.
First, what is LNN? What are the advantages/disadvantages compared
with LiNbO3, also mentioned?

Second, is this probe intended to be used similarly to a normal probe,
carried around and put onto hot surfaces for a few seconds? Is thermal
shock not a problem here? The devices I have read about
previously have been permanently mounted, for condition
monitoring.



    
 
 
K. Matthies
K. Matthies
03:30 Sep-27-1996
Re: High temperature probes
makes sense to
heat them up slowly in order to allow for a balanced heat flow. (approx.
10 min./100 degrees centigrade).


Best regards,

K. Matthies




    
 
 
K. Matthies
K. Matthies
02:38 Oct-04-1996
Re: High temperature probes
Dear Mr. Hammond,

The LNN piezo ceramic are developed in a project financed by EC research programme. In the same project, we have made further development in the transducer. The report that you find in the workshop is practically the final report.

It is true that these transducers are used in applications which requires large inspection time. We also use these transducers for determining wall thickness in Zinc coating plants. We measure the wall thickness by immersion technic in approximately 450 °C hot Zinc.

For your requirement, we have developed other type of transducers. As far as the construction of these transducers are concerned, it is similar to the previous one except that these are housed in plastic material. They are suitable only for continuous application up to 200 °C.

Since they posses ceramic delay path, it is possible to use these transducers on hot surfaces upto 1000 °C. However, this is possible in time intervals of 10 sec with 50 sec pause.

With best regards

K. Matthies



    
 
 
Peter Hammond
Peter Hammond
01:51 Oct-04-1996
Re: High temperature probes
Dear Mr Matthies,
Thankyou for your reply to my post.

I was aware that Ferroperm were working on LiNbO3 ceramics but I did not
know they were so near to success.

Your description of slow heating to high temperature is much as I
expected. Effectively this would tend to limit application to continuous
monitoring, surely? This is of course a very valuable task, but wouldn't
it be nice to be able to use the probe fully portably?

Best regards,
Dr Peter Hammond,
Cygnus Intruments.

: Dear Mr. Hammond,

: The LNN piezo ceramic are developed in a project financed by EC research programme. In the same project, we have made further development in the transducer. The report that you find in the workshop is practically the final report.

: It is true that these transducers are used in applications which requires large inspection time. We also use these transducers for determining wall thickness in Zinc coating plants. We measure the wall thickness by immersion technic in approximately 450 °C hot Zinc.

: For your requirement, we have developed other type of transducers. As far as the construction of these transducers are concerned, it is similar to the previous one except that these are housed in plastic material. They are suitable only for continuous application up to 200 °C.

: Since they posses ceramic delay path, it is possible to use these transducers on hot surfaces upto 1000 °C. However, this is possible in time intervals of 10 sec with 50 sec pause.

: With best regards

: K. Matthies




    
 
 
K. Matthies
K. Matthies
01:53 Oct-04-1996
Re: High temperature probes
Because the probes have in their front only a thin Lambda/2-diaphragm, it makes sense to
heat them up slowly in order to allow for a balanced heat flow. (approx.
10 min./100 degrees centigrade).


Best regards,

K. Matthies

: Dear Mr Matthies,
: Thankyou for your reply to my post.

: I was aware that Ferroperm were working on LiNbO3 ceramics but I did not
: know they were so near to success.

: Your description of slow heating to high temperature is much as I
: expected. Effectively this would tend to limit application to continuous
: monitoring, surely? This is of course a very valuable task, but wouldn't
: it be nice to be able to use the probe fully portably?

: Best regards,
: Dr Peter Hammond,
: Cygnus Intruments.

: : Dear Mr. Hammond,

: : The LNN piezo ceramic are developed in a project financed by EC research programme. In the same project, we have made further development in the transducer. The report that you find in the workshop is practically the final report.

: : It is true that these transducers are used in applications which requires large inspection time. We also use these transducers for determining wall thickness in Zinc coating plants. We measure the wall thickness by immersion technic in approximately 450 °C hot Zinc.

: : For your requirement, we have developed other type of transducers. As far as the construction of these transducers are concerned, it is similar to the previous one except that these are housed in plastic material. They are suitable only for continuous application up to 200 °C.

: : Since they posses ceramic delay path, it is possible to use these transducers on hot surfaces upto 1000 °C. However, this is possible in time intervals of 10 sec with 50 sec pause.

: : With best regards

: : K. Matthies




    
 
 

Product Spotlight

NovaScope 6000

The all-digital Novascope 6000 is a portable, ultra-high precision thickness gauge for high-speed
...
thickness measurement. Novascope 6000 has unmatched capabilities and unique features including: •Superior Resolution with high contrast, high-speed color RF display •High pulser voltage •Real-time video output •Increased internal/external data storage •Programmable SetUp features •Battery & AC Powered
>

I&T Nardoni

NDT, RESEARCH AND DEVELOPMENT OF NEW METHODOLOGY, TRAINING CENTER I&T NARDON INSTITUTE was idiated
...
in 1988 by Giuseppe Nardoni, now president and owner of the company, based on his multi-annual and international experience in the field of NDT.
>

Research Center IDEKO develops an ultrasonic train wheel inspection system for CAF

The Basque Research centre IK4-IDEKO has developed a state-of-the-art ultrasonic inspection system f
...
or the train wheel. This system secures a sound condition of train wheels and is thus a significant contribution to rail transport safety. The device was delivered to CAF recently and its use allows the manufacturer to become an approved supplier of rolling stock in Italy, as it meets the demanding homologation standards of this country. \\\\r\\\\n
>

FAAST-PA! OEM Patented phased Array for high speed UT inspection

Multiangle, Multifocus, Multifrequency, Multibeam. Instead of stacking UT electronics and having m
...
any PA probes, FAAST-PA is able to transmit all delay laws within ONE single shot in Real time.
>

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