The study of the transfer function characteristic of long-base laser strainmeters is the base to explain the interferometer output data. The long-base laser strainmeter comprises the long-base optical interferometer and signal demodulation system, by measuring the change in displacement between the fixed points to determine the actual strain. According to the principle of the strainmeter and the working process of the signal demodulation system, we completed the theoretical modeling of the optical interferometer and the demodulation system, and determined its amplitude-frequency and phase-frequency characteristic. And we obtained the transfer function characteristic curve, providing a basis for the analysis of system output data and the optimization of the laser strainmeter design.

Date Published: 5 December 2011
PDF: 10 pages
Proc. SPIE 8197, 2011 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 819710 (5 December 2011); doi: 10.1117/12.904897

Published in SPIE Proceedings Vol. 8197:
2011 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments
Yongtian Wang; Yunlong Sheng; Han-Ping Shieh; Kimio Tatsuno, Editor(s)