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Optical Engineering

Absolute length measurement using changeable synthetic wavelength chain
Author(s): Chunyong Yin; Zhixia Chao; Dejiao Lin; Yi Xu; Jie Xu
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Paper Abstract

There has been much interest in use of a tunable diode laser for absolute distance interferometry. We report on a novel method?using changeable synthetic wavelength chain (CsWC) to measure absolute length?based on a tunable diode laser. During the measurement, the desired synthetic wavelengths are calculated according to the distance to be measured and the measurement uncertainty. Then by tuning the wavelength of the laser, the desired synthetic wavelength chain is created. In addition, a differential measurement setup, which consists of two dual-beam interferometers, is proposed to test the feasibility of the CSWC method. The experiment results demonstrate that the CSWC method can work effectively. Although under present conditions a measurement uncertainty of only 3 x 10-5 is achieved, it is sufficient to design a differential optical probe.

Paper Details

Date Published: 1 April 2002
PDF: 5 pages
Opt. Eng. 41(4) doi: 10.1117/1.1459053
Published in: Optical Engineering Volume 41, Issue 4
Show Author Affiliations
Chunyong Yin, Tsinghua Univ. (China)
Zhixia Chao, Tsinghua Univ. (China)
Dejiao Lin, Tsinghua Univ. (China)
Yi Xu, China National Institute of Metrology (China)
Jie Xu, China National Institute of Metrology (China)

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