基于聚焦式超声波传感器的悬移质浓度测量研究  

Research on the Method of Suspension Concentration Measurement Based on the Focused Ultrasonic

作　　者：夏一丹 谢代梁[1] 安雅丽[1] 王月兵[1] XIA Yidan;XIE Dailiang;AN Yali;WANG Yuebing(Key Lab of Flow Meas Techn of Zhejiang Province,China Jiliang University,Hangzhou 310018,China)

机构地区：[1]中国计量大学,浙江省流量计量技术研究重点实验室,杭州310018

出　　处：《传感技术学报》2018年第3期483-490,共8页Chinese Journal of Sensors and Actuators

基　　金：国家自然科学基金项目(#11474259);浙江省自然科学基金项目(#LY17F030013)

摘　　要：液体中悬移质含量是表征液固两相流的重要参数之一,其准确测量具有重要意义。基于超声波在悬移质中传播的衰减效应,提出了一种新型聚焦式传感器对悬移质的浓度进行测量。以不同悬移质浓度和粒径的水-泥沙混合物作为测量介质,利用数据采集卡获取衰减反馈波形,经过小波去噪和快速傅里叶变换FFT(Fast Fourier Transformation)得到衰减信号的频谱图,根据浓度与衰减系数对应关系建立悬移质浓度模型。实验数据表明,混合粒径和单一粒径下衰减系数与浓度分别呈现三次函数关系和良好的幂函数关系,在实验范围内,3种不同平均粒径下的模型平均相对误差基本在3%以内,均方根误差在10%以内,证明了所建立的模型有一定的可行性。The suspended sediment content is an important parameter of liquid-solid two-phase flow,whose measurement is of great significance.Based on the ultrasonic attenuation effect during the propagating through the suspension,a new focused transducer was proposed to do some researches on the measurement of suspended sediment concentration.Water and sediment mixtures with different sediment concentration and particle size were selected as experimental medium.The ultrasonic attenuation feedback waves of samples were acquired by the data acquisition card.Frequency spectrums were achieved by the wavelet denoising and Fast Fourier Transformation(FFT)method.Several measurement models of suspended sediment concentration were established according to the corresponding relationship between sediment concentration and attenuation coefficient.The experimental data show that,the relationships between attenuation coefficient and concentration under mixed particle size and single particle size follow cubic function and power function respectively.In the experimental range,the measurement error of sediment concentration is less than 3%,and the root mean square error is less than 10%,proving that the established models are feasible.

关 键 词：液固两相流 聚焦传感器 超声波衰减法 悬移质 浓度 

分 类 号：TK124[动力工程及工程热物理—工程热物理]