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 -

Hi-Spec Systems
we are specialised in the design, development and manufacture of Phased Array and Time-of-Flight Diffraction (ToFD) ultrasonic inspection systems.
489 views
Technical Discussions
Xiang Yan
Xiang Yan
18:59 Apr-14-2009
near field DGS

From measurements, I found the near field structures of Universal DGS curves tend to underestimate the FBH amplitude. I know the near field curves are obtained based on a compromise derived from measurements and calculations for various probes.

Are the curves were designed to be conservative and represent the minimum responses so that to incorporate the variations in the field applications ?

Thanks!

 
 Reply 
 
Gerhard Splitt
R & D, -
Private, Germany, Joined Nov 1998, 38

Gerhard Splitt

R & D, -
Private,
Germany,
Joined Nov 1998
38
10:06 Apr-17-2009
Re: near field DGS
In Reply to Xiang Yan at 18:59 Apr-14-2009 (Opening).

High Xiang,
DGS curves do not include any reserve for measurement tolerances. The compensation for measurement uncertainties will be given by the measurement procedure. This has to set an acceptance level which is below the critical flaw size. For example, when the critical flaw size is a 3 mm FBH the acceptance level has to be set e.g. 6 or 12 dB below the 3 mm FBH DGS curve.

 
 Reply 
 

Product Spotlight

NEW! The PragmaPro Instrument Platform

The PragmaPro is based on a modular cartridge technology and supports various NDT instrument modal
...
ities such as UT, PAUT, ECT and many more. This new platform is based on a machined, powder-coated aluminum frame for shock-proofness, best sealing qualities and maximum heat dissipation. This is practical to extend the outdoor temperature range and/or to extend the power injected in the transducers. The PragmaPro is aiming at a very wide range of applications, such as weld scanning, corrosion mapping and composite testing.
>

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.
>

Ultrasonic Testing Immersion Tanks with Unmatched Scanning Features

TecScan’s non-destructive testing Ultrasonic Immersion Tanks & scanners are designed for high pe
...
rformance and demanding NDT testing applications. Our Scan3D™ line of High Precision Immersion Tanks are specifically designed for automated ultrasonic testing of complex composites parts used in aerospace and industrial applications.
>

NDT.net launches mobile-friendly design

NDT.net has revamped its website providing a mobile-friendly design.The front page received a comp
...
letely new design and all other sections are now reacting responsively on mobile devices. This has been a major step to make our website more user- friendly.
>

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