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 -

465 views
Technical Discussions
Marvin Klein
Director, -
Intelligent Optical Systems, USA, Joined Nov 1998, 3

Marvin Klein

Director, -
Intelligent Optical Systems,
USA,
Joined Nov 1998
3
02:46 Sep-06-1996
Airscan transducer performance

A few questions about airscan transducer performance.

(1) What kind of resolution can you obtain in 1/2 inch thick composite materials?
(2) What is the frequency used and the signal-to-noise ratio?
(3) What are the limitations in thickness?

Have you looked at combining laser generation of ultrasound (very efficient, and still noncontact) with airscan detection?


Marvin Klein


 
 Reply 
 
Bill Grandia
Bill Grandia
00:49 Sep-08-1996
Re: Airscan transducer performance
: A few questions about airscan transducer performance.

: (1) What kind of resolution can you obtain in 1/2 inch thick composite materials?
: (2) What is the frequency used and the signal-to-noise ratio?
: (3) What are the limitations in thickness?

: Have you looked at combining laser generation of ultrasound (very efficient, and still noncontact) with airscan detection?

:
: Marvin Klein

1) Please refer to our answers to R. Diederichs' questions.
2) Airscan instrumentation (Sonda 007) uses discrete frequencies of 200, 400, and 1000 kHz, 400 kHz being the most commonly used value. The S/N ratio depends on the overall gain level and and material attenuation. In general, S/N ratio better than 40:1 can be achieved.
3) Please consider that the losses due to the bulk absorption are negligible as compared to the reflection losses at the surfaces. Thickness limitations are therefore not critical. We have successfully inspected composite laminates of up to 6 inches thickness.

Yes. Preliminary experiments in detecting laser generated ultrasound with air-coupled acoustic receivers in composite laminates gave a S/N ratio of about 40:1. Further investigations are in progress.




 
 Reply 
 

Product Spotlight

FMC/TFM

Next generation for Phased Array UT is here now with FMC/TFM! Have higher resolution imaging, impr
...
oved signal to noise ratio, characterize, size and analyze defects better with access to several wave mode views and save raw FMC data for higher quality analysis.  Some of the benefits are:
  • Beautiful Image! Easier to understand what you're looking at
  • Completely focused in entire image or volume
  • Much easier to define setups before inspection
  • Easier to decipher geometry echoes from real defects
  • Oriented defects (e.g. cracks) are imaged better
  • See image from different wave modes from one FMC inspection
  • FMC data can be reprocessed/analyzed without going back to the field
>

A1525 SOLO

A1525 Solo – the most compact and affordable TMF unit with two phased array transducers and 3D v
...
isualization and analysis software in standard delivery set. A compact, ergonomic and easy to handheld Phased Array unit based on Total Focusing Method for easy-going imaging of inspection objects with two-dimensional and three-dimensional visualization and evaluation of inspection results.
>

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.
>

Micro CT

nanoVoxel series has nano-scale resolution upto 500nm by using high voltage X-ray source (from 80-
...
300 kV) with micro/nano focal spot and highly sensitive flat panel detectors and unique Optical coupling detector.
>

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