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 -

ACS-Solutions GmbH
develop and manufacture hi-tech devices for Ultrasonic Testing

1524 views
Technical Discussions
Chris Coughlin
Chris Coughlin
01:06 Oct-18-2001
Dry-coupled UT transducers

Hi All;

TRI/Austin is looking for "dry coupled" ultrasonic transducers in the 1-5 MHz range that generate shear waves. Our application is a pretty tight fit, and ideally we're looking for fluid-filled wheels or similar configurations. Any and all help is appreciated; more info on the RFI is available from http://www.ntiac.com/rfi.html. Please note we're not interested in alternative NDE techniques or transducers (e.g. EMATs) at this stage.

Thanks!
Chris



    
 
 
Kelly Phelps
Consultant, IT Manager/Marketing Manager
NDT Engineering Corporation, USA, Joined Oct 2001, 6

Kelly Phelps

Consultant, IT Manager/Marketing Manager
NDT Engineering Corporation,
USA,
Joined Oct 2001
6
06:23 Nov-02-2001
Re: Dry-coupled UT transducers
: Hi All;
.
: TRI/Austin is looking for "dry coupled" ultrasonic transducers in the 1-5 MHz range that generate shear waves. Our application is a pretty tight fit, and ideally we're looking for fluid-filled wheels or similar configurations. Any and all help is appreciated; more info on the RFI is available from http://www.ntiac.com/rfi.html. Please note we're not interested in alternative NDE techniques or transducers (e.g. EMATs) at this stage.
.
: Thanks!
: Chris
.

Are you looking for dry-coupled roller probes? By what you describe this is what I am guessing.


    
 
 
Chris Coughlin
Chris Coughlin
06:55 Nov-02-2001
Re: Dry-coupled UT transducers
: : Hi All;
: .
: : TRI/Austin is looking for "dry coupled" ultrasonic transducers in the 1-5 MHz range that generate shear waves. Our application is a pretty tight fit, and ideally we're looking for fluid-filled wheels or similar configurations. Any and all help is appreciated; more info on the RFI is available from http://www.ntiac.com/rfi.html. Please note we're not interested in alternative NDE techniques or transducers (e.g. EMATs) at this stage.
: .
: : Thanks!
: : Chris
: .
.
: Are you looking for dry-coupled roller probes? By what you describe this is what I am guessing.
.


Yes, we're mainly interested in dry-coupled roller probes, but we haven't been able to find any yet that will support shear wave modes.


    
 
 
Ed Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1252

Ed Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1252
07:16 Nov-02-2001
Re: Dry-coupled UT transducers
: : : Hi All;
: : .
: : : TRI/Austin is looking for "dry coupled" ultrasonic transducers in the 1-5 MHz range that generate shear waves. Our application is a pretty tight fit, and ideally we're looking for fluid-filled wheels or similar configurations. Any and all help is appreciated; more info on the RFI is available from http://www.ntiac.com/rfi.html. Please note we're not interested in alternative NDE techniques or transducers (e.g. EMATs) at this stage.
: : .
: : : Thanks!
: : : Chris
: : .
: .
: : Are you looking for dry-coupled roller probes? By what you describe this is what I am guessing.
: .
.
:
: Yes, we're mainly interested in dry-coupled roller probes, but we haven't been able to find any yet that will support shear wave modes.
.
Do you REALLY mean that the dry-coupled roller must support Shear mode, as in SH shear wave inspection?
To accomplish this as a "coupling medium" you would still need a nonNewtonian viscous fluid to then couple the SH mode from the roller into the workpiece if using a piezo-element. Even with good SH shear coupling materials (like honey) you are likely to struggle to maintain a constant quality of coupling. It is hard enough to do this in a static condition let alone trying to do so on a dynamic scan.
I would think that most shear wave applications would use SV shear so you would rely on mode conversion from compression waves and the reverse (SV to compression) just as is done when using standard plastic refracting wedges.

Otherwise, if it is SH mode you require perhaps EMATs might be the only option.

Ed



    
 
 
Kelly Phelps
Consultant, IT Manager/Marketing Manager
NDT Engineering Corporation, USA, Joined Oct 2001, 6

Kelly Phelps

Consultant, IT Manager/Marketing Manager
NDT Engineering Corporation,
USA,
Joined Oct 2001
6
07:52 Nov-02-2001
Re: Dry-coupled UT transducers
: : : : Hi All;
: : : .
: : : : TRI/Austin is looking for "dry coupled" ultrasonic transducers in the 1-5 MHz range that generate shear waves. Our application is a pretty tight fit, and ideally we're looking for fluid-filled wheels or similar configurations. Any and all help is appreciated; more info on the RFI is available from http://www.ntiac.com/rfi.html. Please note we're not interested in alternative NDE techniques or transducers (e.g. EMATs) at this stage.
: : : .
: : : : Thanks!
: : : : Chris
: : : .
: : .
: : : Are you looking for dry-coupled roller probes? By what you describe this is what I am guessing.
: : .
: .
: :
: : Yes, we're mainly interested in dry-coupled roller probes, but we haven't been able to find any yet that will support shear wave modes.

The problem is that at a shear wave angle, both the thickness of the roller material and the dead air space that might be encountered at the point that the roller curves up off the surface of the part being inspected, would provide too much attenuation. However, a tractor wheel design that keeps the shear wave flat to the surface would work, provided that the rubber tracks are thin enough to transmit sound.


    
 
 
Chris Coughlin
Chris Coughlin
08:17 Nov-02-2001
Re: Dry-coupled UT transducers
: : : : : Hi All;
: : : : .
: : : : : TRI/Austin is looking for "dry coupled" ultrasonic transducers in the 1-5 MHz range that generate shear waves. Our application is a pretty tight fit, and ideally we're looking for fluid-filled wheels or similar configurations. Any and all help is appreciated; more info on the RFI is available from http://www.ntiac.com/rfi.html. Please note we're not interested in alternative NDE techniques or transducers (e.g. EMATs) at this stage.
: : : : .
: : : : : Thanks!
: : : : : Chris
: : : : .
: : : .
: : : : Are you looking for dry-coupled roller probes? By what you describe this is what I am guessing.
: : : .
: : .
: : :
: : : Yes, we're mainly interested in dry-coupled roller probes, but we haven't been able to find any yet that will support shear wave modes.
.
: The problem is that at a shear wave angle, both the thickness of the roller material and the dead air space that might be encountered at the point that the roller curves up off the surface of the part being inspected, would provide too much attenuation. However, a tractor wheel design that keeps the shear wave flat to the surface would work, provided that the rubber tracks are thin enough to transmit sound.
.


Right, that's pretty much the same conclusion we had come to for the transducers. We're hoping to find some COTS transducers, rather than (pun intended) reinvent the wheel.


    
 
 
Kelly Phelps
Consultant, IT Manager/Marketing Manager
NDT Engineering Corporation, USA, Joined Oct 2001, 6

Kelly Phelps

Consultant, IT Manager/Marketing Manager
NDT Engineering Corporation,
USA,
Joined Oct 2001
6
08:36 Nov-02-2001
Re: Dry-coupled UT transducers
: Right, that's pretty much the same conclusion we had come to for the transducers. We're hoping to find some COTS transducers, rather than (pun intended) reinvent the wheel.


It really wouldn't be hard to design since we already make several types of roller probes. The question is what you would use for the rubber track.



    
 
 
Ken Camplin
, Joined ,

Ken Camplin

,
Joined

00:39 Nov-02-2001
Re: Dry-coupled UT transducers
: : : : Hi All;
: : : .
: : : : TRI/Austin is looking for "dry coupled" ultrasonic transducers in the 1-5 MHz range that generate shear waves. Our application is a pretty tight fit, and ideally we're looking for fluid-filled wheels or similar configurations. Any and all help is appreciated; more info on the RFI is available from http://www.ntiac.com/rfi.html. Please note we're not interested in alternative NDE techniques or
transducers (e.g. EMATs) at this stage.
: : : .
: : : : Thanks!
: : : : Chris

: : : .
: : .
: : : Are you looking for dry-coupled roller probes? By what you describe this is what I am guessing.
: : .
: .
: :
: : Yes, we're mainly interested in dry-coupled roller probes, but we haven't been able to find any yet that will support shear wave modes.
: .
: Do you REALLY mean that the dry-coupled roller must support Shear mode, as in SH shear wave inspection?
: To accomplish this as a "coupling medium" you would still need a nonNewtonian viscous fluid to then couple the SH mode from the roller into the workpiece if using a piezo-element. Even with good SH shear coupling materials (like honey) you are likely to struggle to maintain a constant quality of coupling. It is hard enough to do this in a static condition let alone trying to do so on a dynamic scan.
: I would think that most shear wave applications would use SV shear so you would rely on mode conversion from compression waves and the reverse (SV to compression) just as is done when using standard plastic refracting wedges.
.
: Otherwise, if it is SH mode you require perhaps EMATs might be the only option.
.
: Ed
.
Hello Chris:

I know you orinally said you were not looking at EMATs, but I am sure you know that EMATs are particularly well suited for generating shear waves, especially SH waves. EMATs have come along way lately and have been fielded in very harsh enviroments and in automated fashion. If you would like to know more about our EMAT systems, please visit us at www.innerspec.com.


    
 
 

Product Spotlight

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.
>

High Resolution Industrial CT System for Small/Medium Size Parts Inspection - YXLON FF35 CT

The YXLON FF35 CT computed tomography system is designed to achieve extremely precise inspection r
...
esults for a wide range of applications. Available in a single or dual tube configuration, it is perfect for very small to medium size parts inspection in the automotive, electronics, aviation, and material science industries.
>

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.
>

FMC/TFM

Next generation for Phased Array UT is here now with FMC/TFM! Have higher resolution imaging, impr
...
oved signal to noise ratio, characterize, size and analyze defects better with access to several wave mode views and save raw FMC data for higher quality analysis.  Some of the benefits are:
  • Beautiful Image! Easier to understand what you're looking at
  • Completely focused in entire image or volume
  • Much easier to define setups before inspection
  • Easier to decipher geometry echoes from real defects
  • Oriented defects (e.g. cracks) are imaged better
  • See image from different wave modes from one FMC inspection
  • FMC data can be reprocessed/analyzed without going back to the field
>

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