You could use a interferometer like Wyco's white light interferrometer,
yours for only ~$100k.

-Mike

>>> mdeshp1@uic.edu 02/04/02 08:26AM >>>
Hi,
I am looking for  a supplier who can provide a contact less micro
displacement sensor for measuring membrane deflection.
I would appreciate if anyone can give me a contact or suggest any other
way
to do the measurement.

Thanks

-Mandar Deshpande
Graduate Student
Mechanical Engineering
UIC- Chicago
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