Re: Piëzo-electric detection of Shear-waves

[ NDT-net Forum ]
[ Follow Ups ] [ Post Followup ] [ Help ]

Re: Piëzo-electric detection of Shear-waves
Posted by: Paul A. Meyer , E-mail: pmeyer@agfandtinc.com, on December 23, 2002 at 16:03 :
In Reply to: Piëzo-electric detection of Shear-waves posted by : T. Idzenga , E-mail: t.idzenga@student.utwente.nl, on December 20, 2002 at 13:04 :
Hello Tim,
If the wave is vertically polarized (particle displacement is perpendicular to the surface) it can be detected with a conventional piezoelectric ultrasound transducer, although sensitivity may be an issue. The lateral dimension of the transducer should be much smaller than the wavelength of the signal.
If the wave is horizontally polarized (particle displacement is parallel to the surface) a piezoelectric transducer specifically designed for the application is best. Also, the couplant need to be sufficiently viscous to couple the shear wave to the probe.
Other types of probes (EMATs, capacitive probes, optical probes) may also be suitable.
Paul
:
Dear all,
.
: I am a student working on a project on acoustic detection. Can anybody tell me about piëzo-electric detection of shear-waves? Specifically about the signal-response in a piëzo-electric layer to a shear-wave?
.
: Many thanks,
.
: Tim.
.

Follow Ups:

Post a Followup:

Name:

E-Mail:

Subject:

Comments:
: Hello Tim, : If the wave is vertically polarized (particle displacement is perpendicular to the surface) it can be detected with a conventional piezoelectric ultrasound transducer, although sensitivity may be an issue. The lateral dimension of the transducer should be much smaller than the wavelength of the signal. : If the wave is horizontally polarized (particle displacement is parallel to the surface) a piezoelectric transducer specifically designed for the application is best. Also, the couplant need to be sufficiently viscous to couple the shear wave to the probe. : Other types of probes (EMATs, capacitive probes, optical probes) may also be suitable. : Paul : : : Dear all, : . : : I am a student working on a project on acoustic detection. Can anybody tell me about piëzo-electric detection of shear-waves? Specifically about the signal-response in a piëzo-electric layer to a shear-wave? : . : : Many thanks, : . : : Tim. : . .

Optional Link URL: Example: "http://www....html". Alternative write "http://www.ndt.net/wshop/attach/filename.htm" if you transfered a filename.htm via FTP

Link Title: is important! Information on my Home Page

Optional Image URL: http://www....gif

Attention! Please click the button only once. This may take a moment to process
[ NDT-net Forum ] [ Help ]

Optional Link URL:	Example: "http://www....html". Alternative write "http://www.ndt.net/wshop/attach/filename.htm" if you transfered a filename.htm via FTP
Link Title: is important!	Information on my Home Page
Optional Image URL:	http://www....gif