9

Laser Doppler vibrometry for measuring vibration in ultrasonic transducers

M. Johansmann and G. Wirth,     Polytec GmbH, Germany

Abstract:

An experimental verification of an ultrasonic transducer or ultrasonic tool is an important design step. In this chapter we discuss laser Doppler vibrometry, which is an established experimental method for non-contact measurement of the transducer vibration amplitude and other properties. Basic measurements on a single test point are discussed as well as scanning entire surfaces and special technologies for ultra-high frequencies and for micro-structure devices.

Key words

laser Doppler vibrometry

scanning laser Doppler vibrometry

Mach–Zehnder interferometer

transducer characterization

9.1 Introduction ...

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