基于超声散射的线性调频液位回波信号仿真  

Simulation Method of Ultrasonic Signal Echo From Measured Liquid Level

作　　者：李鹏[1,2,3] 沈孝龙[1,2,3] 钱银 

机构地区：[1]南京信息工程大学电子与信息工程学院,南京210044 [2]南京信息工程大学江苏省气象探测与信息处理重点实验室,南京210044 [3]江苏省大气环境与装备技术协同创新中心,南京210044

出　　处：《系统仿真学报》2015年第12期2873-2877,共5页Journal of System Simulation

基　　金：国家自然科学基金(41075115);江苏省高校自然科学研究计划(10KJB510012);江苏高校优势学科Ⅱ期建设工程项目

摘　　要：根据超声散射理论,提出一种超声液位回波信号的仿真方法。结合流体边界层理论,将液面划分气相、液相、气体滞留层和液体滞留层4层结构;每层相态又被划分为许多小散射子,散射强度依据含水浓度设定。液面回波信号即为所有散射子的散射信号之和。完成线性调频波液面回波信号仿真后,与相同参数条件下的实际信号进行比对,从波形、时域和频域参数及估计液位等方面,都证明了所提仿真方法可行有效。该方法同样适用于其他发射波形的液位仿真。Based on the ultrasonic wave scattering theory, a simulation method for the ultrasonic signal echo from liquid level was proposed. According to the fluid boundary-layer theory, the liquid level was divided into a four-layer structure, including liquid phase, gas phase, and liquid and gas stagnant layer. Furthermore, every phase was divided into lots of small scatters, and their scattering intensity was set on the basis of the concentration of water molecule. Thus, the echo signal was the sum of reflecting signals from all scatters. Besides, the simulated signal was compared with the real one with the same system parameter settings. The uniformity of waveform time and frequency parameter, and estimated level can demonstrate the feasibility and effectiveness of the proposed method. And, the proposed simulation method can also be suited to other transmitting waveform.

关 键 词：超声 液位测量 线性调频波 信号仿真 

分 类 号：TH816[机械工程—仪器科学与技术]