AOTF-NIR宽带功率超声换能器阻抗匹配网络的设计与优化

发布时间：2018-01-25 09:27

  本文关键词： 功率超声换能器 阻抗频率特性 宽带阻抗匹配网络 全局优化　出处：《电子学报》2017年05期 　论文类型：期刊论文

【摘要】：随着近红外声光可调滤波器(Near Infrared Acousto-Optic Tunable Filter,AOTF-NIR)光谱成像技术在深空探测的广泛应用,超声换能器作为AOTF-NIR核心部件,对其工作带宽、光谱衍射效率及功率效率提出了更高的要求.超声换能器在不同频率下具有不同的输入阻抗,当驱动信号源输出阻抗与换能器输入阻抗失配时将会产生能量损耗,导致无法把功率最大限度的传递给换能器,从而使AOTF-NIR光谱衍射效率降低,影响光谱灵敏度.该文通过射频电路先进设计系统(Advanced Design System,ADS)仿真及实验测试,运用滤波器网络理论,采用LC无耗储能元件设计了一种带通型宽带匹配网络.最终在60-120MHz带宽范围内阻抗匹配网络的回波损耗S_(11)-29.8d B,阻抗匹配网络功率效率达到90%以上.通过不断地微调优化匹配阻抗值及LC参数值,以此来提高光谱衍射效率,使光谱衍射效率最高达90%以上,提高了在620-1150nm波段内的光谱灵敏度及光谱成像清晰度.
[Abstract]:With near infrared acoustooptic tunable filter near Infrared Acousto-Optic Tunable Filter. AOTF-NIR-based spectral imaging technology is widely used in deep space detection. As a core component of AOTF-NIR, ultrasonic transducer has a wide bandwidth. Higher spectral diffraction efficiency and higher power efficiency are required. Ultrasonic transducers have different input impedance at different frequencies. When the output impedance of the driving signal source is mismatched with the input impedance of the transducer, the energy loss will occur, and the maximum power can not be transferred to the transducer, thus reducing the diffraction efficiency of the AOTF-NIR spectrum. This paper applies filter network theory through simulation and experimental test of Advanced Design system ads, an advanced RF circuit design system. A bandpass broadband matching network is designed by using LC energy storage element. Finally, the echo loss of impedance matching network is 11- 29.8dB in the range of 60-120MHz bandwidth. The power efficiency of impedance matching network is more than 90%. The spectral diffraction efficiency can be improved by constantly fine-tuning the matching impedance and LC parameters, and the spectral diffraction efficiency is up to 90%. The spectral sensitivity and spectral imaging clarity are improved in the 620-1150nm band.
【作者单位】： 中北大学山西省光电信息与仪器工程技术研究中心;中北大学电子测试技术重点实验室;中北大学仪器科学与动态测试教育部重点实验室;
【基金】：国际科技合作项目(No.2013DFR10150,No.2012DFA10680) 山西省青年科技研究基金(No.2014021012)
【分类号】：TB552;TN713
【正文快照】： 3.中北大学仪器科学与动态测试教育部重点实验室,山西太原030051)1引言近红外声光可调滤波器AOTF-NIR作为一种新型分光系统,它具有可调滤波范围宽、分辨率高、衍射效率高等优点,广泛应用于机载或星载的成像光谱仪[1,2].本AOTF-NIR系统采用直接数字式频率合成器(Direct Digital，

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