Analysis and design of coherent super-heterodyne laser Doppler vibrometer system

摘要

In this paper, the authors use the A.O. frequency-shifted Mach-Zehnder interferometer as system's basic configuration, and propose the coherent super-heterodyne model to achieve system's high precision and noise-free characteristics. To increase the dynamic linear measurement range, the frequency compression and decompression technique is also discussed in this model, and an example with 64 times measurement range enlargement is given to demonstrate the result.