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Compensation of the refractive index of air in laser interferometer for distance measurement: A review

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Abstract

We review the progress made for compensation of the refractive index of air in laser-based distance measurements in the field of precision engineering. First, a comprehensive analysis is introduced to clarify how the overall measurement uncertainty is affected by the refractive index of the ambient air, particularly for dimensional metrology and geodetic survey using laser in open-air environment. Second, it is explained that the measurement uncertainty can be improved to a 10-8 level by adopting empirical dispersion formulae describing the relation of the laser wavelength with the environment parameters such as temperature, pressure, humidity and carbon dioxide concentration. Third, the principle of refractometers is given to describe that the measurement uncertainty can be enhanced to a 10-9 level by identifying the refractive index of air real time in well-controlled environmental conditions. Fourth, the two-color compensation method is discussed which enables precise laser-based distance measurement simply by using two different wavelengths without actual identification of the refractive index of open air. Finally, the recent approach of using femtosecond lasers is described with emphasis on the performance of the two-color method can be enhanced to a 10-9 level by stabilizing the pulse repetition rate as well as frequency stability of ultrashort pulse lasers with reference to the atomic clocks.

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Abbreviations

L :

measured distance

e :

excess fraction

λ :

laser wavelength

n :

refractive index of air

T :

air temperature

P :

air pressure

P w :

water vapor pressure

P CO2 :

CO2 concentration

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Acknowledgements

This work was supported by the National Research Foundation of the Republic of Korea (NRF-2012R1A3A1050386).

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  1. Ultrafast Optics for Ultra-precision Group, Department of Mechanical Engineering, KAIST, Science Town, 291, Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea

    Yoon-Soo Jang & Seung-Woo Kim

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Jang, YS., Kim, SW. Compensation of the refractive index of air in laser interferometer for distance measurement: A review. Int. J. Precis. Eng. Manuf. 18, 1881–1890 (2017). https://doi.org/10.1007/s12541-017-0217-y

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