Optical refractive index of air: dependence on pressure, temperature and composition.
@article{Owens1967OpticalRI, title={Optical refractive index of air: dependence on pressure, temperature and composition.}, author={James C. Owens}, journal={Applied optics}, year={1967}, volume={6 1}, pages={ 51-9 } }
The theoretical background and present status of formulas for the refractive index of air are reviewed. In supplement to Edlén's recently revised formula for relative refractivity, the density dependence of refractive index is reanalyzed. New formulas are presented for both phase and group refractive index which are more useful over a wide range of pressure, temperature, and composition than any presently available. The application of the new formulas to optical distance measuring is briefly…
504 Citations
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References
SHOWING 1-10 OF 18 REFERENCES
The Refractive Index of Air
- Physics
- 1966
Present knowledge of the refractive index of air is reviewed. Regarding the absolute values there are as yet no definite indications that the standard adopted in 1953 on the basis of Barrell and…
An air refractometer for interference length metrology
- Physics
- 1965
A refractometer for the measurement of the refractive index of the surrounding air is described, in which interference fringes are produced between two beams, one propagated in air, the other in…
Correction of optical distance measurements for the fluctuating atmospheric index of refraction
- Physics, Environmental Science
- 1965
One of the main limitations, at present, to the accuracy of measurements of long baselines by optical methods is the uncertainty in the average index of refraction over the optical path due to…
The Refraction and Dispersion of Air for the Visible Spectrum
- Physics
- 1939
(a) Note on previously recorded values of the refractive index of air. For many centuries astronomers have recognized the effect that the refraction of the earth’s atmosphere has upon observations of…
Investigation of the Invariance of Atmospheric Dispersion with a Long-Path Refractometer*
- Physics, Environmental Science
- 1962
An investigation has been made of the extent to which the relative refractivity of the atmosphere is invariant under changes in pressure and humidity. To achieve the necessary precision a…
Long-Path Interferometry through an Uncontrolled Atmosphere*
- Environmental Science, Physics
- 1962
An investigation has been made of the degree to which the invariance of the relative dispersion of the atmosphere will permit an interferometric separation between geometric path differences and path…
The Dispersion of Standard Air
- Physics
- 1953
By combining Barrell and Sears’ measurements in the visible and Koch’s and Traub’s in the ultraviolet, a dispersion formula for standard air has been derived, viz., (n−1)108=6432.8+2 949…