基于曲线拟合的水声换能器转移阻抗测量

Measurement of transfer impedance for hydrophones based on curve-fitting method

针对传统谱分析法在测量水声换能器转移阻抗时存在频谱泄漏、栅栏效应、频率分辨力有限及限制条件过多等问题,提出基于Levenberg-Marquardt算法的曲线拟合法以改进传统方法。与传统方法比对实验表明:曲线拟合法的测量精度高,限制条件少,在欠采样的情况下仍然可以得到稳定、准确的估值。

Focusing on measurement of transfer impedance for hydrophones, the traditional methods have lots of limitations, including the spectrum leakage, picket fence effect, limited frequency resolution and excessive limited condition, the curve fitting method （CFM） was presented based on Levenberg-Marquardt （L-M） algorithm, which have been used to alleviate those problem. The results of comparison experimentations with traditional show that the CFM brings the same or higher measurement precision with no excessive limited condition and meanwhile the estimated value can still be achieved stably and accurately.