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 -

Hillger Ing. Büro
was founded in 1984 and develops special ultrasonic imaging systems for high-tech materials.
1202 views
Technical Discussions
John Bower
John Bower
06:10 May-23-1997
Pitch-Catch in air

I am looking for equipment to do ultrasonic testing (pitch-catch) in air. I will be working over a range of 0 to 3 meters. I need millimeter resolution. Does anyone know of sources for pulsers, transmitters, receivers? I assume I need to work at 50 to 200 kHz or so, but I am having trouble finding speakers and microphones at these frequencies.



    
 
 Reply 
 
R.J. Freemantle
R.J. Freemantle
00:57 May-23-1997
Re: Pitch-Catch in air



    
 
 Reply 
 
Rolf Diederichs
Director,
NDT.net, Germany, Joined Nov 1998, 608

Rolf Diederichs

Director,
NDT.net,
Germany,
Joined Nov 1998
608
01:59 May-23-1997
Re: Pitch-Catch in air
: I am looking for equipment to do ultrasonic testing (pitch-catch) in air. I will be working over a range of 0 to 3 meters. I need millimeter resolution. Does anyone know of sources for pulsers, transmitters, receivers? I assume I need to work at 50 to 200 kHz or so, but I am having trouble finding speakers and microphones at these frequencies.

First I have some more questions.

Are you really want to do MATERIAL testing?

I don't think that it is possible to work up to 3 meters.
I hope that Jan O. Strycek QMI and panelist on this workshop will shear my doubt.
(Jan: what is the maximum distance?)

What material do you want to test?
You need millimeter resolution in the material?

Rolf Diederichs



    
 
 Reply 
 
Paul A. Meyer
R & D,
GE Inspection Technologies, USA, Joined Nov 1998, 47

Paul A. Meyer

R & D,
GE Inspection Technologies,
USA,
Joined Nov 1998
47
03:08 May-23-1997
Re: Pitch-Catch in air

: I am looking for equipment to do ultrasonic testing (pitch-catch) in air. I will be working over a range of 0 to 3 meters. I need millimeter resolution. Does anyone know of sources for pulsers, transmitters, receivers? I assume I need to work at 50 to 200 kHz or so, but I am having trouble finding speakers and microphones at these frequencies.

I assume you want to measure the distance between the transducer and a target. Ultrasonic Arrays, in Woodinville, Washington, USA, supplies systems with 0.1 mm resolution and a working range of several meters. I beleive there are several other companies supplying such systems. They are often used to do level measurement from above in tanks filled with fluid or powder. Polaroid, the camera company, will sell you an engineering development kit based on the distance ranging systen in there camera but it only has 25 mm resolution.
Paul Meyer (Krautkramer)



    
 
 Reply 
 
Linas Svilainis
R & D,
Kaunas University of Technology, Lithuania, Joined Nov 1998, 67

Linas Svilainis

R & D,
Kaunas University of Technology,
Lithuania,
Joined Nov 1998
67
06:29 May-23-1997
Re: Pitch-Catch in air
: I am looking for equipment to do ultrasonic testing
(pitch-catch) in air. I will be working over a range
of 0 to 3 meters. I need millimeter resolution.
Does anyone know of sources for pulsers, transmitters,
receivers? I assume I need to work at 50 to 200 kHz
or so, but I am having trouble finding speakers and
microphones at these frequencies.

Dear John,

We have an acoustic sonar for location in air
(http://vingis.ktu.lt/ultrasound/sonar.htm).
It depends what you need - milimeter resolution
or accuracy?
We also have system for small distance
measurement which was developed for CRT mask
positioning during manufacturing process.
It has 10um accuracy but it will not cover
more than 30mm.

Could be made as spin-off of Sonar...

Linas Svilainis


    
 
 Reply 
 
John Bower
John Bower
03:38 May-23-1997
Re: Pitch-Catch in air

: : I am looking for equipment to do ultrasonic testing (pitch-catch) in air. I will be working over a range of 0 to 3 meters. I need millimeter resolution.

: First I have some more questions.

: Are you really want to do MATERIAL testing?
: What material do you want to test?
: You need millimeter resolution in the material?

: Rolf Diederichs

First, I wish to thank Rolf for setting up this workshop, and all the others for responding.

No, I don't want to do material testing or air-coupled testing. I simply want to do echo location or position location in air. If I were looking for defects in steel, or trying to locate objects underwater, I would know of several sources of transducers and the associated electronics.

I am trying to do the same sort of thing with air as the material. The problem is to find transducers to couple sound to and from air at hundreds of kiloherz frequencies.

As a further complication, I want to do source location based on timing from multiple receivers. This means I want small transducers, to have very wide angle response. My present idea is to attach a source to the object I wish to locate, and I need to detect the signal at multiple locations to get millimeter accuracy in the source location. It is similar to Acoustic Emission source location. But the material is air.


    
 
 Reply 
 

Product Spotlight

Ultrasonic Squirter/Gantry System

TecScan’s NDT Ultrasonic Gantry Systems are industrial Squirter scanners designed for non-destru
...
ctive quality testing and raster scanning of large structures and parts. The Gantry Systems are usually composed of an Industrial Mechanical Scanner and a Control Room with System Workstation.
>

Research Center IDEKO develops an ultrasonic train wheel inspection system for CAF

The Basque Research centre IK4-IDEKO has developed a state-of-the-art ultrasonic inspection system f
...
or the train wheel. This system secures a sound condition of train wheels and is thus a significant contribution to rail transport safety. The device was delivered to CAF recently and its use allows the manufacturer to become an approved supplier of rolling stock in Italy, as it meets the demanding homologation standards of this country. \\\\r\\\\n
>

High-performance Linear Phased Array Probes

Available to order from stock in a range of 5MHz – 7.5MHz and from 16 to 64 elements. Designed w
...
ith piezo-composite elements, Phoenix phased array probes provide high-resolution imaging to maximise sensitivity; accurate ultrasonic detection and sizing of defects in welds; and effective corrosion mapping. Housed in a rugged stainless steel case for on-site industrial NDT 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