Suspended sediment concentration measurement based on optical fiber technology
Suspended sediment concentration measurement based on optical fiber technology
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DOI：
10.1088/1361-6501/ab188d
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发表时间：
2019-04
影响因子：
2.4
通讯作者：
Rui Wang;Guoliang Yu
中科院分区：
文献类型：
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作者：
Rui Wang;Guoliang Yu
提出了一种基于光纤技术测量水中悬浮泥沙浓度（SSC）的新方法，并开发了具有一定传播长度范围的浊度计原型，以测试该变量对准确性的影响。利用均匀分布于水中的天然沉积物进行了一系列实验，以测试ssc与反射光强度和入射光强度之间的关系。采用现代测量方法采集的检测电压作为表征光强度的参数，在低ssc的情况下，随着沉积物的加入，光强度增加，因此认为它对未知ssc的测量是有用的。试验结果表明，该光纤浊度计具有良好的稳定性和灵敏度，不受水流扰动的影响，且SSC的测量范围由粒径决定。值得注意的是，随着SSC的增加，SSC - detection voltage曲线会出现一个拐点，拐点处SSC以10 g l−1为单位的值接近中位粒径以µm为单位的值，在拐点出现之前，SSC与检测电压呈正对数关系。在ssc相同的前提下，检测电压随中位粒径的增大而减小。在拐点之后，SSC与电压值呈负相关，但由于粒径的差异，相关性不稳定。最后，根据光的散射和吸收原理，对该光纤浊度仪的标定进行了讨论。测量数据处理简单快速，密度值可直接读取。
A novel approach based on optical fiber technology was presented to measure suspended sediment concentration (SSC) in water and A turbidimeter prototypes with a range of propagation lengths was developed in order to test the effect of that variable on accuracy in this study. A series of experimental runs were performed with natural sediments uniformly distributed in water to test the relationship between SSCs, the intensity of the reflected light and the incident light. The detected voltage collected by a modern measurement was introduced as the parameter to characterize the intensity of the light which was confirmed to increase with the sediments added in the case of low SSCs, so it was thought to be useful for measuring the unknown SSCs. The test results indicated that this optical fiber turbidimeter had good stability and sensitivity which could not be affected by water flow disturbance and the measurement range of SSC was determined by the particle size. It was worth noting that an inflection point would appear in the curve of SSCs-Detected voltage as the increase of the SSC and the value of SSC at the inflection point in terms of 10 g l−1 was close to the value of median particle size in terms of µm. Before the inflection point, and there was a positive logarithmic relationship between SSCs and the detected voltage. On the premise of the same SSCs, the detected voltage decreases with the increase of the median particle size. After the inflection point, the SSC is negatively correlated with the voltage value, but the correlation is unstable due to the difference in the particle size. Finally, according to the scattering and absorption principle of light, the calibration of this optical fiber turbidimeter was discussed. The data processing of the measurement is simple and fast, and the density value is directly readable.