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 -
614 views
Technical Discussions
Aziz Rehman
R & D
Quaid-e-Azam University, Islamabad, Pakistan, Joined Apr 2001, 11

Aziz Rehman

R & D
Quaid-e-Azam University, Islamabad,
Pakistan,
Joined Apr 2001
11
09:11 Apr-16-2001
Instrumentation for Guided Waves generation.

Actually, now I am able to calculate the dispersion curves and able to know the angles and the frequency needed to generate a particular guided-mode, but the problem is that the calculated frequecy is of the order of few KHz (~100kHz) for a thickness of about 0.5". And for that low frequency, I need your advice to select the proper instrumentation. Here, (I think) that we need a high voltage tone burst, consisting of a gated, sinusoidal pulse of approximately 5-15 cycles and up to 1000 Volts Peak to
Peak. The narrow band excitation is source is crucial for effectively generating guided wave modes, specially for low frequencies.

So, What you suggest for that !

The type/company that can offer that type of function generator as well as the high voltage amplifier.

And last, but not the least, AM I RIGHT FOR ALL THESE ASSUMPTIONS.

What type of equipment you are using, for the fonction generator, and the transducers (from which company) etc.



 
 Reply 
 
V K Dilip
Consultant
Industrial Support Services, Saudi Arabia, Joined Jan 2001, 8

V K Dilip

Consultant
Industrial Support Services,
Saudi Arabia,
Joined Jan 2001
8
00:57 Apr-17-2001
Re: Instrumentation for Guided Waves generation.
: Actually, now I am able to calculate the dispersion curves and able to know the angles and the frequency needed to generate a particular guided-mode, but the problem is that the calculated frequecy is of the order of few KHz (~100kHz) for a thickness of about 0.5". And for that low frequency, I need your advice to select the proper instrumentation. Here, (I think) that we need a high voltage tone burst, consisting of a gated, sinusoidal pulse of approximately 5-15 cycles and up to 1000 Volts Peak to
: Peak. The narrow band excitation is source is crucial for effectively generating guided wave modes, specially for low frequencies.
.
: So, What you suggest for that !
.
: The type/company that can offer that type of function generator as well as the high voltage amplifier.
.
: And last, but not the least, AM I RIGHT FOR ALL THESE ASSUMPTIONS.
.
: What type of equipment you are using, for the fonction generator, and the transducers (from which company) etc.
.

You could contact Plant Integrity in UK, they have a working system.And yes, the frequency if 100KHz and below.
Their address is jdharrison@twi.co.uk



 
 Reply 
 
John O'Brien
Consultant, -
Chevron ETC , USA, Joined Jan 2000, 280

John O'Brien

Consultant, -
Chevron ETC ,
USA,
Joined Jan 2000
280
02:53 Apr-24-2001
Re: Instrumentation for Guided Waves generation.
You should try Guided Ultrasonics Limited UK email malcolm.russel1@virgin.net


 
 Reply 
 

Product Spotlight

FAAST-PA! OEM Patented phased Array for high speed UT inspection

Multiangle, Multifocus, Multifrequency, Multibeam. Instead of stacking UT electronics and having m
...
any PA probes, FAAST-PA is able to transmit all delay laws within ONE single shot in Real time.
>

GEKKO - Portable Phased Array Testing with TFM in Real-Time

The portable phased array testing system GEKKO provides 64 parallel test channels. On creating testi
...
ng parameters the operator is assisted by the CIVA software. Due to its modular set-up the GEKKO instrument is suitable for operators of all skill levels.
>

Echomac® Small

Available with up to eight channels of electronics to detect and evaluate thickness, flaws and eccen
...
tricity, this UT tester is housed in a convenient, smaller cabinet. This instrument can be used in conjunction with bubbler or immersion tank systems, or with a test bench or in laboratory applications. The Echomac® Small is available in the FD4, FD6 or FD6A versions.
>

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.
>

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