Infrared and Laser Engineering, Volume. 52, Issue 11, 20230134(2023)
Investigation of high-precision seawater refractive index sensor based on optical heterodyne interference
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Fig. 1. Optical schematic diagram of the refractive index measurement system
Fig. 3. (a) Demodulated phase signal in time domain; (b) The probability density distribution of the phase and Gauss curve (red line) as a contrast
Fig. 4. (a) Relation between standard deviation and
Table 1. Measurement results of repeatability experiment
View tableView in ArticleTable 1. Measurement results of repeatability experiment
Test number Standard deviation of refractive index/RIU 1 $ 2.391\;3\times {10}^{-8} $ 2 $ 2.709\;0\times {10}^{-8} $ 3 $ 1.100\;5\times {10}^{-8} $ 4 $ 2.342\;4\times {10}^{-8} $ 5 $ 1.109\;4\times {10}^{-8} $ 6 $ 1.405\;5\times {10}^{-8} $ 7 $ 6.513\;8\times {10}^{-9} $ 8 $ 1.145\;8\times {10}^{-8} $ 9 $ 1.523\;8\times {10}^{-8} $ 10 $ 1.469\;1\times {10}^{-8} $ Average $ 1.584\;8\times {10}^{-8} $
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Shiwen Zhang, Liyan Li, Yan Zhou, Qin Liu, Yongjie Wang, Yuliang Liu. Investigation of high-precision seawater refractive index sensor based on optical heterodyne interference[J]. Infrared and Laser Engineering, 2023, 52(11): 20230134
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Received: Feb. 10, 2023
Accepted: --
Published Online: Jan. 8, 2024
The Author Email: Liyan Li (lyli@semi.ac.cn)
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