| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Pascal Realization by Comb-Spectral-Interferometry Based Refractometer |
| Li-Jun Yang, Yan Li** |
State Key Laboratory of Precision Measurement Technology & Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084
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| Cite this article: |
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Li-Jun Yang, Yan Li 2018 Chin. Phys. Lett. 35 107801 |
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Abstract 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 $2.9\times 10^{-9}$. Moreover, the final $u(p)$ is $\sim$$8.7\times 10^{-6}$ in a measurement range of several megapascals (MPa). Our apparatus is compact, fast (15 ms for one single measurement) and easy to handle. Furthermore, the measurement uncertainty will be improved to $\sim$$1\times 10^{-9}$ or lower if a VIPA-based spectrometer is used. The value of $u(p)$ will thus increase to $3\times 10^{-6}$ or better in several MPa.
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Received: 02 June 2018
Published: 15 September 2018
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| PACS: |
78.20.Ci
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(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
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07.60.Hv
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(Refractometers and reflectometers)
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07.07.Df
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(Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing)
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42.25.Hz
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(Interference)
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06.20.-f
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(Metrology)
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| Fund: Supported by the National Key R&D Program of China under Grant No 2018YFF0212300, and the National Natural Science Foundation of China under Grant No 51575311. |
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