Filter detection of phase-modulated laser probe signals
- 3 September 1981
- journal article
- Published by Institution of Engineering and Technology (IET) in Electronics Letters
- Vol. 17 (18) , 661-662
- https://doi.org/10.1049/el:19810462
Abstract
Two simple frequency filtering methods are described for demodulating laser probe measurements of acoustic vibration signals. Measurements are presented of Lamb wave scattering in a plate waveguidc and of acoustic second-harmonic generation in a length expander resonator. In the second example spurious second-harmonic signals are rejected by using a phase heterodyning technique.Keywords
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