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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。
According to the theory of ultrasonic scattering, a simulation method of ultrasonic level echo signal is proposed. According to the theory of fluid boundary layer, the liquid surface is divided into four layers: gas phase, liquid phase, gas retention layer and liquid retention layer. The phases of each layer are divided into many small scatters. The scattering intensity is set according to the water concentration. The liquid level echo signal is the sum of the scattered signals of all the scattering sub-signals. After the simulation of the LFMW echo, the simulation results are compared with the actual signals under the same parameters. The simulation results show that the proposed method is feasible and effective in terms of waveform, time domain, frequency domain parameters and estimated level. This method is equally applicable to the simulation of liquid level in other transmitted waveforms.