中文摘要：

动床河工模型试验中，需要对泥沙浓度进行实时和精确的测量。由于悬沙系统性质的特殊性，使得问题相当复杂。针对这一状况，分析了悬沙系统对光的散射特性，采用了红外测沙的技术来满足测量要求，并实现了测量过程的自动化处理。具体分析了该测量方法的原理和装置的具体结构及其作用。实际情况表明，该装置结构简单，测量结果准确，具有良好的实用性。

英文摘要：

In mobile bed experiments, the measurement of sediment concentration needs to be real-time and accurate. The light-scattering property of sediment suspension was analyzed, and an infrared technology was used to satisfy the measurement requirements. Also, the automation of measurement process was achieved. The principle of the measurement method and the instrument structure were discussed. The application of this technique shows that the structure of this instrument is simple and reliable, the measurement result is accurate.