Title :
Filter detection of phase-modulated laser probe signals
Author :
Auld, B.A. ; Ayter, S. ; Tan, M. ; Hauden, D.
Author_Institution :
Stanford University, Edward L. Ginzton Laboratory, Stanford, USA
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 :
measurement by laser beam; signal detection; vibration measurement; Lamb wave scattering; acoustic second-harmonic generation; acoustic vibration signals; demodulating laser probe measurements; frequency filtering methods; length expander resonator; phase heterodyning technique; plate waveguide;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19810462
