Volume 15 Issue 4
Jul.  2022
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FU Xing-li, FENG Jie, FAN Xiao-hui, PAN Meng-yun, WEI Qiu-ye. Optimization design and test of a high-precision measuring device of liquid refractive index based on the method of minimum deviation angle[J]. Chinese Optics, 2022, 15(4): 789-796. doi: 10.37188/CO.2022-0064
Citation: FU Xing-li, FENG Jie, FAN Xiao-hui, PAN Meng-yun, WEI Qiu-ye. Optimization design and test of a high-precision measuring device of liquid refractive index based on the method of minimum deviation angle[J]. Chinese Optics, 2022, 15(4): 789-796. doi: 10.37188/CO.2022-0064

Optimization design and test of a high-precision measuring device of liquid refractive index based on the method of minimum deviation angle

doi: 10.37188/CO.2022-0064
Funds:  Supported by 2020 Guangxi Young and Middle-Aged Teachers’ Basic Scientific Research Ability Improvement Project (No. 2020KY39006); 2018 Key R & D Project of Guangxi Science and Technology Plan (No. AB1850039); 2019 Scientific Research Project of Guangxi Vocational & Technical Institute of industry
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  • Corresponding author: 38652808@qq.com
  • Received Date: 08 Apr 2022
  • Rev Recd Date: 24 Apr 2022
  • Available Online: 02 Jul 2022
  • For high-precision refractive index measurements of amorphous fluids, the minimum deviation angle method was used to design a novel thermostatic hollow trigonal prism device. The optical path and thermostatic compenents of the device are precisely designed. The device can be used not only to measure the refractive index of liquids, but also to quantify the measurement results and uncertainties. Firstly, the precise design and machining of the optical plane helps to precisely control the measurement light. Secondly, the tortuous hollow tube inside the thermostatic jacket is designed, which allows temperature fluctuations and uniformity of the liquid to be sufficient for high-precision refractive index measurements. Finally, the device is applied to measure a liquid’s refractive index, and the measurement uncertainty of each influence factor is quantitatively analyzed. The experimental results show that the refractive index measurement of three liquids, namely water, isooctane and tetrachloroethylene, could achieve an accuracy of 10−7 at 10−5 of uncertainty. Thus, the device provides a method for highly-precise measurements of the refractive index of liquids.

     

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