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

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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.
Publisher
KOREAN SOC PRECISION ENG
Issue Date
2017-12
Language
English
Article Type
Review
Keywords

INCLUDING RECOMMENDED RADIATIONS; OPTICAL FREQUENCY METROLOGY; FEMTOSECOND LIGHT-PULSES; MEASURING INSTRUMENT; HETERODYNE INTERFEROMETER; ATMOSPHERIC INDEX; PERIODIC NONLINEARITY; PRACTICAL REALIZATION; HIGH-RESOLUTION; REFRACTOMETER

Citation

INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING, v.18, no.12, pp.1881 - 1890

ISSN
2234-7593
DOI
10.1007/s12541-017-0217-y
URI
http://hdl.handle.net/10203/238774
Appears in Collection
ME-Journal Papers(저널논문)
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