6163银河.net163.am/学工新闻 2014-10-22 00:00:00 来源:周新兰 点击: 收藏本文
物电学院第十期学术沙龙
主办:现代光学技术应用研究所
时间:2014年10月24日下午2:30
地点:理六栋2楼多功能厅
报告人: 黄佐华教授
题目:Quantitative Measurement of Phase Variation Amplitude of Ultrasonic Diffraction Grating Based on Diffraction Spectral Analysis
摘要:A new method based on diffraction spectral analysis is proposed for the quantitative measurement of the phase variation amplitude of ultrasonic diffraction grating. For a traveling wave, the phase variation amplitude of the grating depends on the intensity of the zeroth- and first-order diffraction waves. By contrast, for a standing wave, this amplitude depends on the intensity of the zeroth-, first-, and second-order diffraction waves. The proposed method is verified experimentally. The measured phase variation amplitude ranges from 0 to 2π, with relative error of approximately 5%. A nearly linear relation exists between the phase variation amplitude and driving voltage. Our proposed method can also be applied to ordinary sinusoidal phase grating.