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The extent and causes of air refractivity differences in industrial environments have been assessed at the level of less than 1 part in 1.0 E7 using a refractometer instrumentation package capable of both direct measurement and calculation of the refractive index of the atmosphere from interference refractometer and atmospheric sensor measurements. The results of these measured and calculated values are discussed, together with the comparison of a number of industrial air refractivity measurement sensors.

Additional information

Authors: BIRCH K P, National Physical Laboratory, Teddington (GB);WARD R E, National Physical Laboratory, Teddington (GB);REINBOTH F, Physikalisch-Technische Bundesanstalt, Braunschweig (DE);WILKENING G, Physikalisch-Technische Bundesanstalt, Braunschweig (DE)
Bibliographic Reference: Article: Metrologia, Vol. 30 (1993) pp. 7-14
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