In laser Doppler vibrometry of sinusoidal vibration, direct analysis of the photodetector output or the heterodyne signal using a spectrum analyzer is emphasized. A technique utilizing the spectra at the carrier frequency and the first sideband is proposed for unambiguous analysis of the vibration amplitude. Experimental results demonstrate the validity of the proposed technique.
Chandra S. Vikram,
T. E. McDevitt,
"Simple Spectrum Analysis In Laser Doppler Studies Of Sinusoidal Vibrations," Optical Engineering 28(8), 288922 (1 August 1989). https://doi.org/10.1117/12.7977057