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 -

ZETEC, Inc.
is your Key Supplier of Phased Array UT and Eddy Current Solutions.– Complete and Fully Integrated!

1003 views
Technical Discussions
Vinny
Vinny
04:04 Mar-17-2004
RF Display

When and why would you use the RF display when performing ultrasonic thickness measurements?


    
 
 
Richard Kazares
Richard Kazares
06:11 Mar-18-2004
Re: RF Display
The A-Scan is needed for thickness measurements when you want to be able to discriminate between corrosion (plate thinning) and possible delamination (linear internal cracking).

Without the A-Scan (or an Amplitude-based C-Scan image) it would be impossible to tell the difference - and could result in incorrect conclusions and repair actions.

----------- Start Original Message -----------
: When and why would you use the RF display when performing ultrasonic thickness measurements?
------------ End Original Message ------------




    
 
 
Phil
Sales, -
MISTRAS Products & Systems, USA, Joined Feb 2002, 12

Phil

Sales, -
MISTRAS Products & Systems,
USA,
Joined Feb 2002
12
09:20 Mar-18-2004
Re: RF Display
I concur

----------- Start Original Message -----------
: The A-Scan is needed for thickness measurements when you want to be able to discriminate between corrosion (plate thinning) and possible delamination (linear internal cracking).
: Without the A-Scan (or an Amplitude-based C-Scan image) it would be impossible to tell the difference - and could result in incorrect conclusions and repair actions.
: : When and why would you use the RF display when performing ultrasonic thickness measurements?
------------ End Original Message ------------




    
 
 
Vinny
Vinny
00:53 Mar-19-2004
Re: RF Display
I think you misunderstood the question. I realize you need the A-scan for identification of indications but what I was wondering is why would you use a RF display on the A-scan as opposed to using the full wave rectified or half wave + or half wave -.

My understanding is it is more accurate especially at high frequencys but I am not sure if this is right and if it is right why.

Can anyone please explain the purpose of the RF display.

Thanks.

----------- Start Original Message -----------
: I concur
: : The A-Scan is needed for thickness measurements when you want to be able to discriminate between corrosion (plate thinning) and possible delamination (linear internal cracking).
: : Without the A-Scan (or an Amplitude-based C-Scan image) it would be impossible to tell the difference - and could result in incorrect conclusions and repair actions.
: : : When and why would you use the RF display when performing ultrasonic thickness measurements?
------------ End Original Message ------------




    
 
 
Ahmed Yamani
Director, - President & CEO
Yamani Institute of Technology, Algeria, Joined Nov 2001, 23

Ahmed Yamani

Director, - President & CEO
Yamani Institute of Technology,
Algeria,
Joined Nov 2001
23
06:36 Mar-19-2004
Re: RF Display

RF (Radio Frequency) signal is needed if one is interested in advanced signal processing that uses phase information as well as amplitude,(such as defect identification/classification). However, if amplitude based signal processing is used one can used the rectified version of the A-scan.
Good Luck

----------- Start Original Message -----------
: I think you misunderstood the question. I realize you need the A-scan for identification of indications but what I was wondering is why would you use a RF display on the A-scan as opposed to using the full wave rectified or half wave + or half wave -.
: My understanding is it is more accurate especially at high frequencys but I am not sure if this is right and if it is right why.
: Can anyone please explain the purpose of the RF display.
: Thanks.
: : I concur
: : : The A-Scan is needed for thickness measurements when you want to be able to discriminate between corrosion (plate thinning) and possible delamination (linear internal cracking).
: : : Without the A-Scan (or an Amplitude-based C-Scan image) it would be impossible to tell the difference - and could result in incorrect conclusions and repair actions.
: : : : When and why would you use the RF display when performing ultrasonic thickness measurements?
------------ End Original Message ------------




    
 
 
Csaba Hollo
Csaba Hollo
04:29 Mar-27-2004
Re: RF Display
----------- Start Original Message -----------
: When and why would you use the RF display when performing ultrasonic thickness measurements?
------------ End Original Message ------------

Sorry if this is a bit of a diatribe...

Many a-scan instruments, including digital flaw detectors utilize gate intercept techniques for time of flight measurements. Observation of the back wall echo characteristics using the unrectified (RF) signal often leads to a more accurate measurement. The operator is able to select a more "clean" echo to trigger the measurement gate. Historically, I have used RF to take thickness measurements on high temperature materials using non hi temp couplants. The couplant would "flash", allowing a few seconds to take the measurement. With limited time for recognition of true back wall echos versus noise, the RF display helps a lot to determine the true back wall echoes.
RF displays will help in making more accurate measurements when transducer selection is less than optimal.


    
 
 

Product Spotlight

Wireless TOFD scanner

Quick, accurate and highly reproducible welds testing. The System operates wirelessly and is compat
...
ible with any type of Windows based Laptop, Desktop or Tablet.
>

Lyft™: Pulsed Eddy Current Reinvented

PEC Reinvented—CUI Programs Redefined Corrosion under insulation (CUI) is possibly the greatest u
...
nresolved asset integrity problem in the industry. Current methods for measuring wall thickness with liftoff, without removing insulation, all have severe limitations. Eddyfi introduces Lyft — a reinvented, high-performance pulsed eddy current (PEC) solution. The patent- pending system features a state-of-the-art portable instrument, real- time C-scan imaging, fast data acquisition with grid-mapping and dynamic scanning modes, and flexibility with long cables. It can also scan through thick metal and insulation, as well as aluminum, stainless steel, and galvanized steel weather jackets. Who else but Eddyfi to reinvent an eddy current technique and redefine CUI programs. Got Lyft?
>

EKOSCAN Phased Array

In order to always fit your needs, EKOSCAN can manufacture any type of UT transducer, either convent
...
ional or Phased Array. As an ISO 9001: 2015 certified company, EKOSCAN is extremely careful as far a material selection and manufacturing processes are concerned. Our probes guarantee our customers the benefits of latest innovations regarding piezo-composite, backing, impedance adaptation layer, etc. Specific probes for hostile environment: high temperature, high pressure, corrosive environment,etc. Specific probes designed to fit your specific application: optimization of every parameter to guarantee you the best detection.
>

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