Pascal Realization by Comb-Spectral-Interferometry Based Refractometer

Li-Jun Yang; Yan Li

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Pascal Realization by Comb-Spectral-Interferometry Based Refractometer

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To break through the limitations of existing pressure standards,which rely on the gravity and toxic mercury,the national metrological institutes prefer a quantum-based pressure standard.Combining the ideal gas law with helium refractivity measurement,we demonstrate a scheme for the realization of the pressure unit.The refractometer is based on a spectral interferometry with an optical frequency comb and a double-spaced vacuum cell.Through fast Fourier transform of the spectral interferograms of the two beams propagating inside and outside the vacuum cell,the helium refractivity can be obtained with a combined standard uncertainty u(n) of 2.9 × 10-9.Moreover,the final u(p) is ～8.7 × 10-6 in a measurement range of several megapascals (MPa).Our apparatus is compact,fast (15 ms for one single measurement) and easy to handle.Furthermore,the measurement uncertainty will be improved to ～1 × 10-9 or lower if a VIPA-based spectrometer is used.The value of u(p) will thus increase to 3 × 10-6 or better in several MPa.

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《中国物理快报：英文版》 |2018年第10期|85-88|共4页
作者
Li-Jun Yang; Yan Li;
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State Key Laboratory of Precision Measurement Technology & Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084;

State Key Laboratory of Precision Measurement Technology & Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084;

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Pascal Realization by Comb-Spectral-Interferometry Based Refractometer

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