一种基于超声阻抗和回波能量的液位检测方法  

A Method for Determining the Liquid Level Based on Ultrasonic Impedance and Echo Energy

作　　者：张斌[1,2] 刘文怡[1,2] 魏月娟[3] 张彦军 张会新[1,2] 张亮[1,2] ZHANG Bin1,2 ,LIU Wenyi1,2 , WEI Yuejuan3 ,ZHANG Yanjun1,2, ZHANG Huixin1,2, ZHANG Liang1,2(1. Key Laboratory of h Science and Dynamic Measurement, Ministry of Education, North University of China, Taiyuan 030051, China ; 2.Science and Technology on Electronic Test and Measurement Laboratory, North University of China, Taiyuan 030051, China; 3. Software School of North University of China, Taiyuan 030051, China)

机构地区：[1]中北大学仪器科学与动态测试教育部重点实验室,太原030051 [2]中北大学电子测试技术重点实验室,太原030051 [3]中北大学软件学院,太原030051

出　　处：《传感技术学报》2017年第11期1625-1629,共5页Chinese Journal of Sensors and Actuators

摘　　要：针对超声波液位检测方法中,传感器和容器壁间的耦合度不佳所带来的稳定性和可靠性降低的问题,提出了一种基于阻抗法并利用回波能量来实现液位检测的方法。该方法利用液位上下方气液介质的阻抗不相等的特性,计算和比较两个接收传感器所接收到的回波能量之间的差异,以此来确定液位的位置。实验结果表明,该方法能够有效地克服因耦合条件不佳所带来的问题,检测精度满足应用需求。For the ultrasonic liquid level detection,a bad coupling between transducers and the container wall always brings the problems of stability and reliability. A method is proposed to determine the liquid level through calculating and comparing the echo energy received by two receiving transducers,which is based on the difference ultrasonic impedance between gas and liquid media in a container. The experimental results indicate that the proposed method can effectively solve the problems caused by a poor coupling,and can meet the accurate requirement.

关 键 词：超声波 阻抗 回波能量 液位 耦合度 

分 类 号：TP216.1[自动化与计算机技术—检测技术与自动化装置]