Novel non-guideway laser interferometer for absolute long distance measurement

Hong Wei Shao*, Zhan Jun Fang, Qiang Wang, Fei Meng, Ming Zhen Lu, Ling Ding Zou, Xue Ping Shen, Jian Jun Cui

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

A novel non-guideway laser interferometer for absolute long distance measurement is presented. An external cavity diode laser (ECDL) shows great selectivity to its wavelength, with a bandwidth less than 100 kHz and a coherent distance of about 1000 m. The wavelength can be continuously tuned from 1495 nm to 1645 nm. These two characteristics enable a wavelength-tuning interferometry for absolute long distance measurement. In the interferometry for measuring the distance of L, the resolution and uncertainty could be 3 nm and 2.5 × 10-6 L respectively, when the measuring range is about 100 m. In order to improve accuracy, exact fraction method can be applied employing several specific wavelengths. By this means, the uncertainty could be up to 5 × l0-7 L.

Original languageEnglish
Pages (from-to)110-113
Number of pages4
JournalJiliang Xuebao/Acta Metrologica Sinica
Volume28
Issue number2
Publication statusPublished - Apr 2007
Externally publishedYes

Keywords

  • Exact fraction method
  • External cavity diode laser (ECDL)
  • Metrology
  • Non-guideway laser interferometer
  • Uncertainty

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