基于LMS的超声换能器温度补偿仿真

Temperature compensation simulation of ultrasonic transducer based on LMS

针对超声波测风、测距等领域中温度变化引起超声波传感器的传输特性变化,从而影响测量精度的问题,提出通过仿真实验研究超声换能器等效电路中各参数随温度变化对传输特性的影响情况,并得出其主要影响的因素。然后根据自适应算法的特性,尝试使用最小均方误差算法(LMS)自适应滤波算法对超声波传感器的传输特性进行补偿。仿真实验结果表明:在单独变化情况下,超声波传感器传输特性主要受动态电感和动态电容影响较大,LMS自适应滤波算法能够对其传输特性进行有效补偿,减小温度变化引起的传输特性变化。

In the ultrasonic application fields of wind speed and distance measurements, temperature changes can cause changes of transmission characteristics of ultrasonic transducers, thus affect the measurement accuracy. Aiming at this problem, a simulation experiments are done to study how the parameters of ultrasonic transducer equivalent circuits change with temperature and how the changes affect the transmission characteristics. The main factors are also got . And then the Minimum Mean Squared Error（LMS） adaptive filter algorithm is adopted to compensate the transmission characteristics of the ultrasonic transducers based on the characteristics of adaptive algorithms. The results show that the transmission characteristics are affected by the dynamic capacitances and dynamic inductances mainly in the condition of single factor changing, and LMS algorithm can compensate the transmission characteristics of ultrasonic transducers and reduce the temperature effect effectively