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在分析传统三电压法测量阻抗优缺点的基础上,提出了一种发射换能器阻抗测量方法,以解决海上单模激发现场检修发射相控阵一致性的难题。该方法仍利用三电压法电路结构,但修改了测量参数。首先介绍了基于系统函数的换能器阻抗测量方法的原理,然后报道了当串联电阻选取不同数值时换能器阻抗测量的结果以及它们与高精度阻抗分析仪测量结果的比较,最后进行误差分析和测量曲线的等效电路参数拟合。通过对它的性能分析可以看到,在保证采样精度条件下,选择阻值相对换能器阻抗偏小的电阻值,其测量精度完全能达到高精度阻抗分析仪的精度。最后,通过对实验测量阻抗曲线的等效电路参数的最小二乘拟合表明,其拟合电参数准确,能应用到换能器匹配网络的设计。
Based on the analysis of the advantages and disadvantages of the traditional three-voltage method to measure the impedance, a method to measure the impedance of the transmitting transducer is proposed to solve the problem of consistency of the launch phased array in the field of single-mode excitation at sea. The method still utilizes the three voltage method circuit structure, but modifies the measurement parameters. First of all, the principle of transducer impedance measurement based on system function is introduced. Then the results of transducer impedance measurement when different values of series resistance are chosen and their comparison with those of high-precision impedance analyzer are reported. Finally, error analysis And fitting the equivalent circuit parameters of the measurement curve. Through the analysis of its performance, we can see that under the condition of ensuring the sampling accuracy, the resistance value of the resistance of the transducer is selected to be smaller than the impedance of the transducer, and the accuracy of the impedance analyzer can reach the accuracy of the high-precision impedance analyzer. Finally, the least-squares fitting of the equivalent circuit parameters of the impedance curve measured experimentally shows that the fitting electrical parameters are accurate and can be applied to the design of the transducer matching network.