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 -

The Ultrasound Institute can develop new advanced ultrasonic measurement, imaging and NDT techniques for non-conventional applications.

Technical Discussions
Jeff Medford
NDT Inspector
Nucor Steel, USA, Joined Apr 2005, 6

Jeff Medford

NDT Inspector
Nucor Steel,
Joined Apr 2005
08:39 Jun-06-2006
Air Couple Testing

Has it implemented in manual application yet. Also can it possibly have a higher freq. used to ensure that the sensitivity is adaquate? Refering to 2.25 or 5 Mhz

Dave Forsyth
R & D
TRI/Austin, USA, Joined Nov 2001, 41

Dave Forsyth

R & D
Joined Nov 2001
00:01 Jun-08-2006
Re: Air Couple Testing
----------- Start Original Message -----------
: Has it implemented in manual application yet. Also can it possibly have a higher freq. used to ensure that the sensitivity is adaquate? Refering to 2.25 or 5 Mhz
------------ End Original Message ------------

No commercial manual air-coupled UT I know of.

Air itself is the limiting factor in frequencies, sound does not propagate well in air at 2MHz, and is virtually zero propagation at any higher frequencies.

The sensitivity is not usually a function of frequency for air-coupled UT, rather it is the large impedance change at boundaries with solids. So you can get only a small fraction of energy into a solid from an air-coupled UT transducer using conventional UT techniques.

There are some interesting things that can be done with air-coupled UT that are not possible with immersion or contact UT, such as surface profiling, resonance spectroscopy, etc. There are also some engineering structures that are of very low density and air-coupled UT hasan advantage here.



Product Spotlight

ISAFE3 Intrinsically Safe Sensor System

ISAFE3 intrinsically safe sensor system of Vallen Systeme is especially targeted at the petrochemica
l - as well as oil and gas transportation industry. The sensor system is designed for permanent monitoring or periodic inspection tasks. Sensors are available for different AE-frequency ranges optimized for corrosion and fatigue crack detection and other applications. The ISAFE 3 sensor system consists of an AE-sensor (model ISAS3) certified according to ATEX/IEC for installation in zone 0, gas group IIC, IP68, 20 to +60 °C, and a signal isolator (model SISO3) certified for installation in zone 2. An ISAS3 sensor can be mounted in atmosphere or submerged, e.g. in water or crude oil. It is supported by mounting tools for temporary (magnets) or permanent (welded) installation. ISAFE3 supports automatic sensor coupling test and can be used with any AE signal processor supporting 28V supply at 90 mA peak, e.g. Vallen Systeme ASIP-2/A.

Immersion systems

ScanMaster ultrasonic immersion systems are designed for high throughput, multi shift operation in a
n industrial or lab environment. These fully integrated systems provide various scanning configurations and incorporate conventional and phased arrays technologies to support diverse applications, such as inspection of disks, bars, shafts, billets and plates. All of ScanMaster immersion systems are built from high accuracy scanning frames allowing for scanning of complex parts and include a multi-channel ultrasonic instrument with exceptional performance. The systems are approved by all major manufacturers for C-scan inspection of jet engine forged discs. Together with a comprehensive set of software modules these flexible series of systems provide the customer with the best price performance solutions.

Conformable wedge transducer

The conformability is obtained with a flexible membrane filled with water between the transducer and
the inspected component. The coupling between the membrane and the component requires a small quantity of water or couplant. The conformable wedge combines the acoustic performance of immersion technique with good coupling and low attenuation.

Ultrasonic Testing Immersion Tanks with Unmatched Scanning Features

TecScan’s non-destructive testing Ultrasonic Immersion Tanks & scanners are designed for high pe
rformance and demanding NDT testing applications. Our Scan3D™ line of High Precision Immersion Tanks are specifically designed for automated ultrasonic testing of complex composites parts used in aerospace and industrial applications.

We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
this is debug window