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ABSOLUTE DISTANCE MEASUREMENT IN AIR USING DUAL FEMTOSECOND LASERS

Guanhao Wu, Luofeng Shen, Kai Ni, Weihu Zhou, Qian Zhou
  • Abstract:
    A dual-comb-based distance measurement method is proposed, which can measure the optical distance of the fundamental and the second harmonics simultaneously, so that two-color method can be applied to correct the refractive index of air. In a 1.6 m long distance measurement, the stability is about 10 µm. In the step-by-step linear test with a range of 1.2 m, the measurement accuracy is demonstrated to be about 20 µm. The results show the present method can be applied in practical distance measurement.
  • Keywords:
    dual frequency comb, distance measurement, the refractive index of air
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  • DOI:
    _unreg_tc14-2014.22

Event details:

  • IMEKO TC:
    TC14
  • Event name:
    TC14 LMPMI Symposium 2014
  • Title:

    11th Symposium on Laser Metrology for Precision Measurement and Inspection in Industry

  • Place:
    Tsukuba, JAPAN
  • Time:
    3 September 2014 - 5 September 2014