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 -

765 views
Technical Discussions
Rolf Diederichs
Director, Editor
NDT.net, Germany, Joined Nov 1998, 603

Rolf Diederichs

Director, Editor
NDT.net,
Germany,
Joined Nov 1998
603
01:58 Feb-28-1998
This Month's UTonline Forum Introduction

This Month's UTonline Forum Introduction

This month's articles focus on Ultrasonic Transducers and Arrays, generated by piezoelectric or electromagnetic (EMAT). As usual, this will be the theme of our discussion. If you are interested in other ultrasonic testing topics, don't hesitate to discuss them on this forum as well.

We are pleased to introduce this month Rainer Meier and Gerard Fleury as our experts for this month. They will serve as coordinators for comments on their areas of expertise for the March 1998 Forum of NDTnet. Both are current Virtual Session Chairman and will serve on the 'Ask the Experts' panel.

~~~~
Rainer Meier has worked at Siemens in the NDT-field since 1978. He is responsible for the development and implementation of innovative NDE-products and services. He is especially knowledgeable about the use of stochastic methods for signal improvement, Neural Networks for defect recognition, EMAT probes and EMAT
applications, and the examination of small laserwelds using extremely focused piezoelectric probes.

Mr. Meier's opening message:
The electromagnetic generation of ultrasound requires good conductivity in the material that has to be inspected. The sound generation is very efficient in ferromagnetic materials and in highly conductive
materials like aluminum. In materials such as stainless steel or nickel-based alloys the sound generation is usually sufficient. The most significant advantage of EMAT is its ability to generate horizontal polarized
shear waves (SH-waves). Other advantages are sound generation without couplant and the possibility of using the EMAT-principle at higher temperatures. The use of SH-waves shows important advantages compared with conventional wave modes:

- propagation of a pure wave mode without energy loss due to wave conversion
or dispersion and without unambiguous echoes caused by unexpected wave modes

- corner effect delivers a good echo from the probe's far surface over the whole
range of incidence angles less interference with the weld geometry in coarse-grained
materials with directed grain structures (stainless steel and dissimilar welds)

- sensitivity for special material properties like texture, etc.

Therefore, EMAT with its advantages enables new and interesting solutions for some important examination tasks.

Related article:
http://www.ndt.net/article/0398/meier/meier.htm
New EMAT Probes useful for various Applications
D. Lingenberg, R. Meier

~~~~~~
Gerard Fleury is managing director of IMASONIC SA. He currently works on new applications of piezocomposite transducers. His experience in transducers includes numerous NDT/NDE applications where piezocomposite technology is used to improve inspections and reach new targets on technical or functionality aspects.

Mr. Fleury's opening message:
Current Inspection performance needs vary greatly. Although standard transducers achieve satisfactory results for some applications, there is an increasing demand for new approaches and new features. Transducer design and production according to the specific functionality of each inspection is one way to accomplish this; the use of phased array transducers with variable characteristics, notably beam focusing and beam steering, is another. Articles from TECNATOM (SPAIN) and UPPSALA UNIVERSITY (SWEDEN) illustrate recent developments using innovative transducers.

Related articles:
http://www.ndt.net/article/0398/meier/meier.htm
Ultrasonic Inspection of Copper Canisters using Phase Arrays
T. Stepinski, P. Wu, E. Martinez, Uppsala University

http://www.ndt.net/article/0398/tanarro2/tanarro2.htm
Turbine Blade Attachment In Service Inspection through the Central Bore using Ultrasonic Array Technology
A. Tanarro; F. Godinez; P. Serrano (TECNATOM,S.A.- MADRID-Spain)

http://www.ndt.net/article/0398/tanarro1/tanarro1.htm
Ultrasonic Inspection of Complex Nozzles - Application of new Technologies
A. Tanarro and A. Garcia (TECNATOM,S.A.-MADRID-Spain)

~~~~~
Now it's your turn, let's start our discussion.
Your personnel question could be answered.

- Enjoy -
Rolf Diederichs

Recipient of the mailing list may visit
http://www.ndt.net/wshop/forum/forum.htm
There is more material available.


    
 
 
Gareth MC Dowell
Gareth MC Dowell
06:27 Feb-25-1999
high temperature ultrasonic transducers
I'm looking for a HT Ultrasonic Transducer.
I need the complete transducer to operate at
an elevated temperature of 350 C(660F).

Can anybody direct me to someone who could make them?

Thanks


    
 
 
Hong Fangjun
Hong Fangjun
06:51 Oct-31-2001
Re: high temperature ultrasonic transducers
I am also looking for a HT ultrasonic transducer which can work at the elevated temperature of 800 Celsius Degree.



    
 
 
yateenacharya
yateenacharya
09:17 Sep-08-2002
Re: high temperature ultrasonic transducers
: I am also looking for a HT ultrasonic transducer which can work at the elevated temperature of 800 Celsius Degree.
.i am preparing seminar on this topic



    
 
 

Product Spotlight

Research and Applications Development For NDT

The Research and Applications Development (RAD) group is a newly formed team within Acuren dedicat
...
ed to tackling challenging inspection problems. Our focus is the development of novel, field deployable, advanced inspection techniques for use in cases where standard NDT methods are ineffective. We don't wait for new innovations, we engineer them. From concept to commissioning.
>

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
>

AMIGO2

TSC Amigo2 - ACFM technology has developed a solid reputation for accurately detecting and sizing
...
surface-breaking cracks through paint and coatings. As the industry demands increased performance in speed, signal quality, and portability, it’s time for an evolution. It’s time for Amigo2.
>

SONOAIR - air-coupled Phased Array Ultrasonic Inspection System

For highly attenuating materials, the performance of the system is critical. The ultrasonic sensors,
...
the scanning area and the system settings should be flexibly adapted to the test task and the material. These high expectations are met with the new and modular testing system SONOAIR. With the world’s first air-coupled phased-array UT inspection system SONOAIR we developed a technology that works with up to 4 transmitter and receiver channels with freely configurable square wave burst transmitters as wells as low noise receiving amplifiers.
>

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