Ms. Xia Cen Profile

Xia Cen

at Shandong Univ

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Proceedings Article | 12 March 2021 Paper

High precision refractometer for salinity measurements based on aspheric surface

Wei Wei, Xia Cen, Xiaoxue Bai, Chi Wu

Proceedings Volume 11763, 117636T (2021) https://doi.org/10.1117/12.2587387

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A new sensor is proposed in this paper for measuring the refractive index of seawater based on optical refraction. Different from the traditional method of measuring the angle of refraction, the optical path is more complex. An aspheric lens is placed between the V-shaped groove and PSD to increase sensitivity. And a down-collimater is used to reduce the size of spot. The influence of aspheric lens on sensitivity and nolinearity is studied. Theoretically, the sensitivity of the refractive index can reach up to 6329.45mm/RIU.

Proceedings Article | 31 January 2020 Paper

Optimal design of optical refractometer for seawater salinity measurement

Xia Cen, Juan Su, Guoqiang Li, Wei Wei, Xiaoxue Bai, Chi Wu

Proceedings Volume 11427, 1142748 (2020) https://doi.org/10.1117/12.2553186

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Salinity of seawater is one of the most important ocean parameters. Salinity of seawater is mainly obtained by conductivity measurement using CTD (Conductivity-Temperature-Depth). Conversion accuracy between conductivity and salinity relies on the assumption that components of seawater are fixed, as well as high accuracy and synchronism measurements of conductivity, temperature and pressure. The study of seawater salinity based on the V-block optical refractive index method provides a total different principle for salinity measurement. Achieving high resolution seawater optical refractive index measurements could help to study factors affecting the accuracy of salinity measurement. In this paper, the various instrument parameters that affect the accuracy of seawater refractive index measurement are analyzed and the optical refractometer is optimized based on the components on the shelf. This paper systematically analyzed the resolution and tolerance of refractive index measurement on the parameters of V-block refractometer, such as incident angle, external environment and prism refractive index, etc. The optical refractometer with an air film layer on both sides of the V-block was proposed for seawater salinity measurement. With such an optimization, the measurement accuracy is further improved and the tolerance is increased. The theoretical resolution to the seawater refractive index and salinity are 1.8×10^-6 and 0.01‰, respectively. Experimentally, we have achieved 3.9×10^-6 and 0.021‰ respectively, and a good linearity. The difference between theoretical and experimental results are analyzed.

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