微波零平衡相位法检测多层复合材料的粘结缺陷

Adhesion Defect Detection of Compound Multi-layer Material with Microwave Phase Zero-Balance Method

提出了一种采用微波零平衡相位法检测多层复合材料 (特别是吸音材料 )粘结缺陷的新方法。该方法的特点是 :使用数字移相器和数字衰减器作为比较基准 ;使用零平衡相位方法检测相位变化 ;使用全局曲线拟合进行数据处理。本文提供的样例试验条件为 :微波源工作频率 1.15GHz ,输出功率 10 0mW ,复合材料厚度 50mm ,粘结层缺陷空气层厚度 3mm ,检测到平均相位变化为 2 .2° ,经过曲线拟合数据处理后 ,平均相位变化可精确到 2 .17°。实验结果表明 :该系统结构简单、使用方便。

A new method for detecting adhesion defect of compound multi layer material esp ecially for sound absorbed material with microwave phase zero balance method i s proposed in this paper. This method uses a digital phase shifter and a digital attenuator as standards to compare with the target, uses zero balance method t o check phase variations. Test condition: MW source 1.15GHz, 100mW, rubber test material thickness 50mm, air gap thickness 3mm. Test result: average phase varia tion 2.2° (2.17° after mesh curve data processing). The experiment shows that the system is simple, easy to use, fast and with higher sensitivity.