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Investigation of surface acoustic waves in laser shock peened metals

Chinese Optics Letters 2008年第11期6卷 837-840页

作者：袁玲严刚沈中华徐杭威倪晓武陆建 Department of Applied Physics Nanjing University of Science and TechonologyNanjing 210094 College of Mathematics and Physics Nanjing University of Posts and TelecommunicationsNanjing 210046

Laser shock peening is a well-known method for extending the fatigue life of metal components by introducing near-surface compressive residual stress. The surface acoustic waves （SAWs） are dispersive when the near-surface properties of materials are changed. So the near-surface properties （such as the thickness of hardened layers, elastic properties, residual stresses, etc.） can be analyzed by the phase velocity dispersion. To study the propagation of SAWs in metal samples after peening, a more reasonable experimental method of broadband excitation and reception is introduced. The ultrasonic signals are excited by laser and received by polyvinylindene fluoride （PVDF） transducer. The SAW signals in aluminum alloy materials with different impact times by laser shock peening are detected. Signal spectrum and phase velocity dispersion curves of SAWs are analyzed. Moreover, reasons for dispersion are discussed.

关键词： Acoustic surface wave devices Acoustic surface wave filters Acoustic wave velocity Acoustic waves Acoustics acoustoelectric effects Alumina Cutting Elastic waves Lasers Phase velocity Pulsed laser applications Residual stresses Strength of materials Surfaces Trace analysis

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Multi-channel surface acoustic wave device and its application on all-fiber acousto-optic modulation

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Chinese Optics Letters 2010年第1期8卷 107-110页

作者：赵路明赵启大 Institute of Physics Nankai University Institute of Modern Optics Nankai University

The interaction of multi-channel surface acoustic waves （SAWs） and a guided optical wave in fiber is studied, and the corresponding coupled wave equations are derived. A novel two-channel SAW all-fiber acousto-optic... 详细信息

关键词： Acoustic waves Acoustics acoustoelectric effects Wave equations

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Test method of frequency response based on diamond surface acoustic wave devices

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Optoelectronics Letters 2011年第4期7卷 291-293页

作者：陈希明杨保和吴小国吴佚卓 Tianjin Key Laboratory of Film Electronic and Communication Device Tianjin University of Technology

In order to reduce the noises affixed to the signals when testing high frequency devices,a single-port test mode(S11) is used to test frequency response of high frequency(GHz) and dual-port surface acoustic wave devices(SAWDs) in this *** feasibility of the test is proved by simulating the Fabry-perot *** frequency response of the high-frequency dual-port resonant-type diamond SAWD is measured by S11 and the dual-port test mode(S21),*** results show that the quality factor of the device is 51.29 and the 3 dB bandwidth is 27.8 MHz by S11-mode measurement,which is better than the S21 mode,and is consistent with the frequency response curve by simulation.

关键词： Acoustic surface wave devices Acoustic waves Acoustics acoustoelectric effects Signal processing Surface testing Testing

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