作者：艾春安, 蔡笑风, 李剑, 刘凯旋
作者单位：火箭军工程大学, 陕西 西安 710025
关键词：干耦合;超声波激励;窗函数;品质因数
摘要：
为保证干耦合超声波探头的正常工作，采用理论分析与实验相结合的方法对其激励信号进行选择。干耦合超声波探头与试件直接接触，入射能量低，不同粘接状况下接收信号能量（E）差异较大，品质因数（Q）能够表征接收信号的带宽及强度分布，两者可作为激励信号的选择依据。根据各信号表达式分别采用方波、锯齿波及高斯窗、海明窗和汉宁窗调制的正弦脉冲信号进行试验。试验结果表明：在重复频率和电压幅值不变的条件下，对于玻璃纤维/丁腈橡胶复合材料粘接板，最优激励波形为5周期汉宁窗调制正弦波脉冲信号，激励频率约为100 kHz，为干耦合超声波探头的检测应用提供基础。
Research on dry coupled ultrasonic excitation signal
AI Chun'an, CAI Xiaofeng, LI Jian, LIU Kaixuan
Rocket Force University of Engineering, Xi'an 710025, China
Abstract: To ensure the operation of dry coupled ultrasonic probe, theoretical analysis and experiment are jointly applied to select its excitation signal. The projectile energy of the dry coupled ultrasonic probe is low because it has direct contact with the specimen. The energy (E) of the receipt signal differs greatly under different bonding conditions. Quality factor(Q) can represent the bandwidth and intensity distribution of receipt signal and they can be used as the basis for selecting excitation signal. According to the expression formula of each signal, sinusoidal impulse signal modulated by square wave, sawtooth wave, Gauss window, Hamming window and Hanning window were used for test. Test results show that the optimal excitation waveform for the glass fiber/nitrile rubber bonded composite plate is the sine pulse signal with an excitation frequency of about 100 kHz modulated by 5-cycle Hanning window under constant repetition frequency and voltage amplitude. It provides a basis for the detection of dry coupled ultrasonic probe.
Keywords: dry coupled;ultrasonic wave excitation;window function;quality factor
2016, 42(12): 12-17,28 收稿日期: 2016-03-23;收到修改稿日期: 2016-04-28
基金项目: 国家自然科学基金项目（51275517）
作者简介: 艾春安(1964-),男,湖南邵阳市人,教授,博士生导师,研究方向为固体火箭发动机无损检测。
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