Laser Doppler vibrometry for measuring vibration in ultrasonic transducers

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


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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