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• W4229451821 abstract "A procedure is presented which calibrates a wavelength/refractive-index tracker, so that it can compensate for the absolute refractive index of air within 3 × 10 −8 ⋅ n . The procedure employs ultrahigh-purity helium and argon as reference gases of known n ( p , T ) to deduce the two unknown parameters in the working equation of the tracker: gas pathlength and pressure-induced distortion error. The performance of the gas calibration procedure is evaluated by comparing the corrected tracker against a master refractometer based on a Fabry–Perot cavity in nitrogen, a third reference gas of known n ( p , T ). In nitrogen, the calibrated trackers demonstrate accuracy at the level of 4 × 10 −9 ⋅ n . Testing in a fourth reference gas—water vapor—reveals that the working equation of the trackers must include a third unknown parameter: an end-effect caused by a moisture-dependence of the reflection phase-shift. Correcting for this moisture-related error represents the largest contribution to measurement uncertainty, and explains why performance of the calibrated trackers is an order-of-magnitude worse in moist air than in pure gas. In air, the Fabry–Perot cavity-based refractometer performs within 5 × 10 −9 ⋅ n , but is not a commercially-available device. • A gas-based calibration procedure enables commercial wavelength/refractive-index trackers to be absolute at point-of-use. • Testing of the commercial devices against a master refractometer in dry gas and in water vapor reveal the performance limits. • Measurement of water vapor refractivity is compared with a recent ab initio calculation of the static dipole polarizability. • Comparison to an Edlen equation reveals that a formulation due to Bönsch and Potulski is essentially exact at 633 nm and NTP." @default.
• W4229451821 created "2022-05-11" @default.
• W4229451821 creator A5029876033 @default.
• W4229451821 date "2022-09-01" @default.
• W4229451821 modified "2023-09-29" @default.
• W4229451821 title "Capability of commercial trackers as compensators for the absolute refractive index of air" @default.
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• W4229451821 doi "https://doi.org/10.1016/j.precisioneng.2022.04.011" @default.
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