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盐水浓度的变化会引起其对光的折射率的变化 ,对于固定的倾斜入射光线 ,折射率的变化会导致出射光线发生偏移 ,利用位置敏感器件 (PSD)检测光线偏移量的大小 ,便可以得到待测盐水的浓度。基于差动折射率测量原理 ,引入了一个装有蒸馏水的参考水槽 ,从而有效地减小了温度漂移对盐度测量带来的影响。初步的实验结果表明了方法的正确性 ,盐度测量的分辨力可达 0 .0 12‰ ,重复性精度好于± 0 .3‰。对测量数据做了详细的论述 ,并对影响测量精度的一些主要因素进行了细致的分析。结果表明 ,该方法的温度漂移和光源强度变化对测量结果的影响很小。
Changes in brine concentration cause changes in the refractive index of light. For a fixed, obliquely incident light, the change in refractive index causes the exiting light to shift, using a position sensitive device (PSD) to detect the amount of light displacement Can be measured salt concentration. Based on the principle of differential refractive index measurement, a reference tank equipped with distilled water is introduced to effectively reduce the effect of temperature drift on salinity measurement. The preliminary experimental results show the correctness of the method. The resolution of salinity measurement can reach 0.012 ‰ and the repeatability accuracy is better than ± 0.3 ‰. The measurement data are discussed in detail, and the main factors affecting the measurement accuracy are analyzed in detail. The results show that the temperature drift and light intensity of the method have little effect on the measurement results.