|Anatol Krozer |
R & D, project manager
Imego Institute, Sweden, Joined Oct 1999, 2
wave propagation at liquid7solid interface
I have 3 requests:
1. Please advise on references regarding frequency dependence of the attenation length for (penetration depth of) acoustic (shear) waves incident from solids onto a solid/liquid interface.
2. Acoustic wave propagating in a solid, e.g. pipe. What are the reflection conditions at an inner surface of the pipe with/without liquid
3. Advise on a broadband flat response sensor to be operated in liquids.
Look forward to many suggestions
Anatol Krozer, assoc. prof.
The IMEGO Institute, Aschebergsgatan 46, bd.11
SE-411 33 Göteborg
tel. +46 (0)31 750 18 06; mobile: +46 (0)709 15 18 06
|Wieslaw Bicz |
Re: wave propagation at liquid7solid interface
: Dear everybody
: I have 3 requests:
: 1. Please advise on references regarding frequency dependence of the attenation length for (penetration depth of) acoustic (shear) waves incident from solids onto a solid/liquid interface.
: 2. Acoustic wave propagating in a solid, e.g. pipe. What are the reflection conditions at an inner surface of the pipe with/without liquid
: 3. Advise on a broadband flat response sensor to be operated in liquids.
: Look forward to many suggestions
: Anatol Krozer, assoc. prof.
: project manager
: The IMEGO Institute, Aschebergsgatan 46, bd.11
: SE-411 33 Göteborg
: tel. +46 (0)31 750 18 06; mobile: +46 (0)709 15 18 06
: e-mail: email@example.com
1. In many books you can find the information, that the shear wave can propagate in the liquid only about 1 wavelength. Frequency dependance is probably not important.
2. You can find in many books concerning ultrasound formulas describing the reflections conditions.
They work very good, but only, if your incidence angles are not narrow to the critical or 90 degrees.
And I don´t know any good formula that can give you real good worth for the phase. We have made a program, that works in many cases.
If you are interested in this problems - plese contact us.
3. I think, we can offer you such transducer. Please see on the following page: http://www.optel.com.pl/manual/english/transd.htm
|Richard Freemantle |
NDT Inspector, Consultant, R&D
Wavelength NDT Limited, United Kingdom, Joined Nov 1998, 16
Re: wave propagation at liquid7solid interface : 2. You can find in many books concerning ultrasound formulas describing the reflections conditions.
: They work very good, but only, if your incidence angles are not narrow to the critical or 90 degrees.
: And I don´t know any good formula that can give you real good worth for the phase. We have made a program, that works in many cases.
: If you are interested in this problems - plese contact us.
A more general solution lies with matrix methods - the equations are more involved but will deal with the issues of critical incidence
angles and evenescent waves.
I have used solutions based on the work of Knopoff.
ref: L. Knopoff (1964) A matrix method for elastic wave problems. Bull. Seism. Soc. Am., Bol. 54, 431-438
The formulations allow the calculation of the compression and shear wave transmission and relfection coefficients for single or multiple interfaces for both compression
and shear wave incidence. These can be calculated as functions of incidence angle and frequency. Forexample, Fourier Analysis will give you the time domain impulse
response of the system.
The formulations are usually derived in the complex frequency domain and will yield the amplitude and phase of the transmission and reflection
coefficients. Depending on what formulation you use, they will give accurate results in situations where the incidence angle is high
leading to complex refraction angles. The formulations generally assume complex wave propagation which will allow you to calculate the effects
of loss in the system (eg frequency dependent attenuation and phase velocity)
A good review of these technqiues can be found in:
MATRIX TECHNIQUES FOR MODELING ULTRASONIC-WAVES IN MULTILAYERED MEDIA
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, 1995, Vol.42, No.4, pp.525-542
Hope this info helps,
Dr. R.J. Freemantle
NDT Solutions Ltd
Keele University Science Park
Tel +44 (0)1782 584306
Fax +44 (0)1782 711093
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.
High-end Ultrasonic Flaw Detector with 32:128PR PAUT and 2-ch TOFD: SyncScan 2
SIUI’s newly launched SyncScan 2, is a high-end ultrasonic flaw
detector with 32:128PR PAUT and
2-ch TOFD, which can maximize your
efficiency for PA and TOFD.
● Support PA/TOFD/UT
● 32-ch PA is more suitable for inspection on extra-thick wall and
● 32-ch PA and 2-ch TOFD work simultaneously.
● Support PR mode for corrosion inspection.
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.
CIVA 2017 UT Module
CIVA NDE Simulation Software is the world leader of NDT
The UT simulation Module incl
- "Beam computation": Beam propagation simulation
- "Inspection Simulation": Beam interaction with flaws or
The user can simulate a whole inspection process (pulse echo,
tandem or TOFD) with a wide range of probes (conventional, Phased-
arrays or EMAT), components, and flaws.