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We present a refractometer which is capable of measuring the refractive indexof gas with an unambiguous range of 1.000395 and uncertainty of 3.1E-8 at 633nm absolutely. The measurement range is extended by means of a group of vacuumtubes according to the principle of quasi-synthetic wavelength (QSW) method.The basic principle of the QSW method and the design of the gas refractometerare presented in detail. The performance of the refractometer has been verifiedby the measurement of dry air, nitrogen gas and ambient air under differentenvironmental situations. The gas-filling or pumping process is not neededduring the measurement, so that we can complete a measurement within 70seconds. Comparing with previous ones, the refractometer reported here hasintegrated virtues of large unambiguous range, fast speed, high accuracy, and asimple instrumentation design.

Design and performance of an absolute gas refractometer based on quasi-synthetic wavelength method