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 -
451 views
Technical Discussions
Ray
Engineering
Penn State, USA, Joined Mar 2004, 1

Ray

Engineering
Penn State,
USA,
Joined Mar 2004
1
00:22 Mar-09-2004
NDT - Delay Lines

Hi All

I am a new user to this field and have my first big project. A related quick question: we have 8 channels which we need to mux. All carry ultrasound responses at the same time. We are looking at delay methods so to sample all of them at the same time.

Any idea on what delay lines to use. We want to use analog delay lines, and want to limit losses. We work at low frequencies (< 10 MHz). Any ideas and brands


 
 Reply 
 
Joerg Schulze-Clewing
Joerg Schulze-Clewing
04:11 Mar-13-2004
Re: NDT - Delay Lines
Ray, it's been a long time that I used analog delay lines.
One manufacturer was Belfuse. I suggest doing a Google
search to see which ones are still out there. Another mfg
we used was Kappa.

Nowadays it is all done digitally. Check out the newer
Texas Instruments AD converters.

All the best, Joerg.

----------- Start Original Message -----------
: Hi All
: I am a new user to this field and have my first big project. A related quick question: we have 8 channels which we need to mux. All carry ultrasound responses at the same time. We are looking at delay methods so to sample all of them at the same time.
: Any idea on what delay lines to use. We want to use analog delay lines, and want to limit losses. We work at low frequencies (< 10 MHz). Any ideas and brands
------------ End Original Message ------------




 
 Reply 
 
Joerg Schulze-Clewing
Joerg Schulze-Clewing
01:59 Mar-13-2004
Re: NDT - Delay Lines
Ray, here is an example of one of the sources a Google
search yields:

http://www.bertech.com/Components/rcd/delaylines.htm

I suggest to stick with passive delay lines and prefer
lower impedances. That makes life easier at 10MHz. Also,
they need to be current driven for summation into a matching
output resistor, that's the usual scenario.

Resist the temptation of using silicon prop delays, it
can result in errors and phase noise.

Regards, Joerg.


----------- Start Original Message -----------
: Hi All
: I am a new user to this field and have my first big project. A related quick question: we have 8 channels which we need to mux. All carry ultrasound responses at the same time. We are looking at delay methods so to sample all of them at the same time.
: Any idea on what delay lines to use. We want to use analog delay lines, and want to limit losses. We work at low frequencies (< 10 MHz). Any ideas and brands
------------ End Original Message ------------




 
 Reply 
 

Product Spotlight

Robotic laser shearography enables 100% inspection of complex, flight-critical composite structures

An article in “Composites World Magazine” showcases Non Destructive Testing of aero-structures
...
with Laser Shearography. Over the years Dantec Dynamics has supplied many solutions for the aerospace industry. Referring to specific customer projects several of these cases are examined to outline the advantages of using Laser Shearography for automated defect detection.
>

NDT Master Lecturer

In the program both university professors and practitioners will give lectures, which guarantees the
...
oretical depth and practical inside. Academic Director: Prof. Dr. Christian Boller
The following lecturers are not complete: Prof. Tadeusz Stepinski, Prof. Wieslaw Staszewski, Prof. Frank Walther, Prof. Giovanni Bruno, Prof. Gerd Dobmann, Prof. Philippe Guy
>

NEOS III

NEOS III is Logos Imagings lightest DR system. With a built-in battery and internal wireless commu
...
nication, the NEOS III is perfect for users that want to quickly assess an item.
>

Cygnus 6+ PRO Multi-Mode Ultrasonic Thickness Gauge

The Cygnus 6+ PRO thickness gauge is the most advance gauge within the Cygnus range with key featu
...
res including: comprehensive data logging; A-scan and B-scan display; manual gain control; Bluetooth connectivity; and much more. With its unique dual display and three measuring modes (Multiple-Echo, Echo-Echo and Single-Echo), this surface thickness gauge offers maximum versatility for inspections.
>

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