Chinese Optics Letters, Vol. 1, Issue 3, 03145 (2003)
Design of differential optical system of in-plane remote displacement measurement
Shunzhong He, Xin Yao, Chengzhi Jiang, Jinfeng Liu, Yanyu Liu, and Lincai Chen
- The National Key Lab of Precision Measuring and Testing Technique and Instrument, Tianjin University, Tianjin 300072
In this paper, an optical system for in-plane remote displacement measurement is brought forward. The remarkable characteristic of this optical system is to use a big aperture lens to focus the waists of two Gauss beams on a scatter which have been expanded and collimated, so good laser Doppler signals and high measurement accuracy are achieved. The experiments prove that the measurement system consisting of this optical system, a lock-in amplifier and a digital filter can be used to measure the in-plane displacement of scatters in distance of 50 m with the relative accuracy of 1%.
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