Equipment Calibration Method for Seawater Refractive Index Based on Distilled Water
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摘要: 在对海水折射率测量设备进行标定时, 针对现有标定方法存在量少价高和操作繁杂等问题, 文中首先基于现有的海水折射率经验模型, 参考南海海域0~2 000 m范围内温度和盐度的动态范围, 计算得到相应折射率的动态范围。提出一种基于蒸馏水的海水折射率测量设备标定方法, 选定蒸馏水介质在符合海洋测量应用的折射率动态范围下, 进行了温度为0.1 ℃步长的折射率测量实验。通过与Tilton经验模型的插值理论值进行对比, 验证经验模型获得的理论值准确性, 为后续基于蒸馏水的海水折射率测量设备的标定应用选定了可信的数据集。Abstract: When measurement equipment for marine refractive index is calibrated, the existing calibration methods have problems such as low quantity, high price, and complicated operation. Based on the existing empirical model of seawater refractive index, the dynamic range of the corresponding refractive index was calculated with reference to the dynamic range of temperature and salinity in the range of 0–2 000 m in the South China Sea. This paper also proposed an equipment calibration method for measuring seawater refractive index based on distilled water. The distilled water medium was selected, and within the dynamic range of refractive index suitable for marine measurement, a refractive index measurement experiment with a temperature interval of 0.1 °C was carried out. By comparing with the theoretical interpolation value of the Tilton empirical model, the accuracy of the theoretical value obtained by the empirical model was verified, and a credible data set was selected for the subsequent calibration and application of the equipment for measuring seawater refractive index based on distilled water.
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Key words:
- seawater refractive index /
- distilled water /
- temperature /
- salinity /
- equipment calibration
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图 1 南海海域0~2 000 m温度动态范围
Figure 1. Dynamic range of temperature in the South China Sea within 0–2 000 m
图 2 南海海域0~2 000 m实用盐度动态范围
Figure 2. Dynamic range of practical salinity in the South China Sea within 0-2 000 m
图 3 不同绝对盐度下海水折射率随温度变化量
Figure 3. Changes in seawater refractive index with temperature under different absolute salinities
图 4 不同温度下海水折射率随绝对盐度变化量
Figure 4. Changes in seawater refractive index with absolute salinity under different temperatures
图 6 不同温度范围下蒸馏水折射率动态范围
Figure 6. Dynamic range of refractive index of distilled water at different temperature ranges
图 7 全反射临界角法测量原理图
Figure 7. Measurement schematic of total reflection critical angle method
图 9 30~50 ℃范围内蒸馏水折射率
Figure 9. Refractive index values of distilled water in the range of 30-50 ℃
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