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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 1,
  • Issue 3,
  • pp. 145-146
  • (2003)

Design of differential optical system of in-plane remote displacement measurement

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Abstract

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%.

© 2005 Chinese Optics Letters

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