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本文报告了两种声表面波(SAW)器件组成的频谱分析系统及其实验结果.使用SAW Chirp滤波器与SAW卷积器组成两种类似的实验系统,进行了连续波信号、调制脉冲信号、以及上述两种信号同时输入的谱分析,还进行了信号加窄带干扰的谱分析.两种系统获得一致的结果.实验表明,这些系统具有8MHz带宽,可分析10μs时宽的信号,其等效滤波器数目等于80.文内给出一些实验照片. 由SAW器件组成的谱分析系统是一种模拟信号处理系统.它具有结构简单、实时、时带积大、体积小、重量轻及功耗低等优点,是七十年代发展起来的,颇受人们的重视.我们在国内首次实现了由SAW Chirp滤波器或/和卷积器组成的两类系统. 相似文献
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This paper is on the experimental study of the real-time air-gap coupled SAW convolver.Itwork at the center frequency of 60 MHz and its interaction length is 8 μs.It is degenerate.The mainperformance of our device features an external convolution efficiency of-57 dBm,a dynamic rangelarger than 70 dB and a convolution output power larger than-15 dBm(load 50 ohm). A new technique for the formation of the air-gap for this device has been developed in our la-boratory. In order to demonstrate the performance and functions of our SAW convolvers,three signalprocessing experiments have been carried out.These experimental results are satisfactory and showthat the SAW convolver can process both the analog and digital signals. 相似文献
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中国科学院声学研究所汪承灏教授最近获得第五届饶流泰物理奖,1997年8月24日在京举行了授奖。为纪念我国物理学界老前辈胡刚复、饶阔泰、叶企孙、吴有训四位先生在开创我国物理事业和建立中国物理学会所作出的卓越贡献,为鼓励在发展中国物理事业,在科学技术上作出突出贡献的中国物理学工作者,中国物理学会设立了”胡刚复、饶统泰、叶企孙、吴有训物理奖”。其中的饶网泰物理奖是授予在光学、声学、原子和分子物理方面作出突出贡献者.该奖项每两年评选一次,每次一般评选一人一项。这次汪承团教授是以”对压电晶体中弹性波场和力学振动… 相似文献
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This paper presents the experimental investigation on the effect of DC bias voltage on the con-volution efficiencies of air-gap coupled acoustoelectric convolvers made of various surface-treatedsilicon strips.For the silicon strips which are thermally oxidized to form 1000 A thick SiO_2,films andthen annealed in nitrogen atmosphere,there appear some new phenomena.We have derived theirtheoretical explanations,but these are only briefly mentioned in this paper. 相似文献
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