基于压电筒状叠堆的无线金属腐蚀探针设计及性能研究

Design and performance study of wireless metal corrosion probes using piezoelectric tube stack

基于压电筒状叠堆和压电阻抗技术提出了一种由压电筒状叠堆和金属杆组成的新型金属腐蚀探针。建立了多层结构探针纵向振动的传递矩阵模型,导出了电学阻抗方程,求得了第一阶谐振频率和反谐振频率,并与已有文献的特例结果进行了对比,验证了理论求解的正确性。此外,采用理论分析、人造定量腐蚀试验、温度敏感试验、加速腐蚀试验和无线阻抗测试试验系统地研究了探针的性能。研究结果表明:探针的第一阶谐振频率和反谐振频率随着杆长减小而增大,随着腐蚀天数的增加而增大,随着温度的增大而减小;无线阻抗系统测量的阻抗谱与传统阻抗分析仪的测量结果一致性较好。研究成果为开发无线定量测量的新型金属腐蚀探针提供重要参考。

A type of metal corrosion probes was proposed using piezoelectric tube stack and electro mechanical impedance technique.The probe consists of a piezoelectric tube stack and a metal bar.The transfer matrix model of the multilayer structured probe in longitudinal vibration mode was established,and the electrical impedance was derived to solve the first resonance and anti-resonance frequencies.The theoretical results were validated by comparing them with those of the special cases in the published literature.In addition,the probe performance was studied systematically through theoretical analysis,artificial uniform corrosion experiments,temperature-sensitive experiments,accelerated corrosion tests,and wireless impedance measurement experiments.Results show that the first resonance and anti-resonance frequencies of the probe are increased with the decrease of the bar length,the increase of the corrosion days,and decreased with the increase of temperature.The measured impedance spectra of the wireless impedance measurement system are consistent with the test results of the traditional impedance analyzer.The present study provides an important reference for developing the novel metal corrosion probes of wireless quantitative measurement.