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 -

Iris Inspection Services, Inc.
We are the world's largest supplier of air cooler, boiler and exchanger tubing inspection services.
466 views
Technical Discussions
Frank Lehmann
Frank Lehmann
04:12 Jun-30-2007
ultrasonic low-frequency flaw detection

Hello,

I recently started working with an ultrasonic low-frequency flaw detector. When trying to understand the principles this method is based on, I encountered some problems. Despite extensive research on the internet I couldn't find any answers to my questions and I'd kindly ask you to help me out. As a general information, the project I'm working on is a concrete tunnel lining. The goal is to measure its thickness and find existing flaws.

* When measuring the thickness of the concrete tunnel lining, depending on the pulse length, I get different results. The longer the pulse, the thicker the lining. Why and how does the pulse length influence my data?

* How does the sounding frequency of the antenna array influence my measuring results? Or does it?

* I was not able to find out how the antenna produces shear waves. The pertinent sites on the internet just talk about EMATs and Laser, of which both don't apply here I think. Of course it's some kind of piezoelectric transducer, but those I thought merely produce longitudinal waves.

* What is the advantage of an antenna array compared to a single probe?

* And last but most important for me, what is the advantage of shear waves in concrete testing -or in general- over compressive waves?

Thank you very much,
Frank Lehmann



 
 Reply 
 
test
test
02:29 Oct-28-2007
Re: ultrasonic low-frequency flaw detection
tt rgrgrgrgrg grgrgrgrgrgr grgrgrgrgrg rergtgtgtt


----------- Start Original Message -----------
: Hello,
: I recently started working with an ultrasonic low-frequency flaw detector. When trying to understand the principles this method is based on, I encountered some problems. Despite extensive research on the internet I couldn't find any answers to my questions and I'd kindly ask you to help me out. As a general information, the project I'm working on is a concrete tunnel lining. The goal is to measure its thickness and find existing flaws.
: * When measuring the thickness of the concrete tunnel lining, depending on the pulse length, I get different results. The longer the pulse, the thicker the lining. Why and how does the pulse length influence my data?
: * How does the sounding frequency of the antenna array influence my measuring results? Or does it?
: * I was not able to find out how the antenna produces shear waves. The pertinent sites on the internet just talk about EMATs and Laser, of which both don't apply here I think. Of course it's some kind of piezoelectric transducer, but those I thought merely produce longitudinal waves.
: * What is the advantage of an antenna array compared to a single probe?
: * And last but most important for me, what is the advantage of shear waves in concrete testing -or in general- over compressive waves?
: Thank you very much,
: Frank Lehmann
------------ End Original Message ------------




 
 Reply 
 

Product Spotlight

CIVA 2020 UT Module

CIVA NDE Simulation Software is the world leader of NDT Simulation. The UT simulation Module incl
...
udes: - "Beam computation": Beam propagation simulation - "Inspection Simulation": Beam interaction with flaws or specimens The user can simulate a whole inspection process (pulse echo, tandem or TOFD) with a wide range of probes (conventional, Phased- arrays or EMAT), components, and flaws.
>

Echomac® Small

Available with up to eight channels of electronics to detect and evaluate thickness, flaws and eccen
...
tricity, this UT tester is housed in a convenient, smaller cabinet. This instrument can be used in conjunction with bubbler or immersion tank systems, or with a test bench or in laboratory applications. The Echomac® Small is available in the FD4, FD6 or FD6A versions.
>

TraiNDE UT

TraiNDE UT is a virtual tool associated with a signal database which simulates real inspection con
...
ditions for numerous applications (Type A/V1 block, DAC block, welds and plates).
>

GEKKO, Standard and Advanced phased-array for Easier inspection

M2M Gekko® is a field-proven flaw detector offering PAUT, UT, TOFD and TFM through the streamline
...
d user interface Capture™. Released in 32:128, 64:64 or 64:128 channel configurations, Gekko combines high- resolution and speed while reducing inspectors’ training 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