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位相光栅彩色滤波器
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作者 王书颖 林定移 《首都师范大学学报(自然科学版)》 1993年第2期51-55,共5页
准直白光入射到一定膜厚的知形位相光栅,由于光栅的消光机制,透过光栅的各级衍射光都具有一定的颜色,即矩形位相光栅可以作为彩色滤波器。水文介绍了产生颜色的机理和制作各色滤波器的方法。
关键词 滤波器 矩形位相光栅 色度坐标 位相调制度
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Laser Doppler Vibrometer Without Directional Ambiguity Using Rectangular Phase Grating
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作者 邓罗根 刘巽亮 李绍英 《Journal of Beijing Institute of Technology》 EI CAS 1993年第1期49-61,共13页
The two-phase detection method for directional discrimination in laser Doppler measurements is discussed.The diffraction efficiency of a sin- gle period rectangular phase grating is analysed and a kind of back-scatter... The two-phase detection method for directional discrimination in laser Doppler measurements is discussed.The diffraction efficiency of a sin- gle period rectangular phase grating is analysed and a kind of back-scattered laser Doppler vibrometer without directional ambiguity using the single peri- od rectangular phase grating as the beam-combiner described.The principles of this kind of vibrometer are explained in detail,and some experimental re- sults are given.In this kind of vibrometer,the rectangular phase grating, without the zero diffracted order and even orders,is used to eliminate use- less stray light and to combine the useful signal light.Differential electronics is employed to reject signal noise.Therefore,the signal-to-noise ratio of Doppler signals and the measurement accuracy of the instrument are im- proved and the range of application is expanded. 展开更多
关键词 laser vibrometers ANEMOMETERS laser Doppler technique/rectangular phase grating two-phase detection directional discrimination
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