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- since 1996 -

Hillger NDT GmbH
was founded in 1984 and develops special ultrasonic imaging systems for high-tech materials.
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Technical Discussions
RS
RS
03:30 Apr-10-2003
Differential Capacitance?

Can anyone point me to some introductory information on how to use (and the basic knowledge behind) differential capacitance sensors? I'm specifically interested in using them for crack-assessment of pipes. Please email me at: russ@ieee.org
Thank you,
R


 
 Reply 
 
Joerg Schulze-Clewing
Joerg Schulze-Clewing
04:12 Apr-11-2003
Re: Differential Capacitance?
Russ, I am not sure what exactly you want to measure
and especially what dimensions the pipes are but if you
want to experiment around a bit maybe this simple
setup would work:

http://www.designnotes.com/CIRCUITS/tiltmeter.htm

If you use something like this it is essential to keep
those diodes as balanced as possible (temp etc.).

Good luck, Joerg.


 
 Reply 
 
R.J.Chaudhari
Director,
CALTECH ENGINEERING SERVICES, India, Joined Mar 2003, 13

R.J.Chaudhari

Director,
CALTECH ENGINEERING SERVICES,
India,
Joined Mar 2003
13
00:55 Apr-11-2003
Differential Capacitance?
Differential capacitance sensors according to information are suitable for thickness measurement and not crack measurement. However laser based techniques can do so. Please check and revert to me at caltech@vsnl.net



 
 Reply 
 

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