基于电光调制的毫米波辐射计研究  

Millimeter-wave radiometer based on electro-optic modulation

作　　者：张跃东[1] 江月松[1] 何云涛[1] 邓士光[1] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191

出　　处：《光电子．激光》2011年第7期1018-1021,共4页Journal of Optoelectronics·Laser

基　　金：武器装备探索研究资助项目(7130730);国家"863"计划资助项目(2007AA12Z114)

摘　　要：研究了一种通过电光调制将毫米波信号加载到光载波上进行处理的毫米波辐射计。天线接收的毫米波信号由电光调制器(EOM)调制加载到光载波的边带上,并通过光纤传输该信号;利用光纤布拉格光栅(FBG)滤波器滤掉载波分量,滤波后保留的边带分量信号由光电探测器(PD)探测。为提高探测灵敏度,使用锁相放大器对PD输出的信号进行检测。分析了采用光学方法处理毫米波信号时的能量转换效率和噪声特性。使用50GHz毫米波信号源对毫米波信号进行了探测实验,测量了实验系统中的能量转换效率和噪声等效功率,并分析了改进探测灵敏度的方法。设计了毫米波辐射测量实验装置,并进行了探测实验。实验结果表明,本文方法可应用于毫米波辐射计。A millimeter-wave radiometer using electro-optic modulation and photodetection is presented.The millimeter-wave energy collected by the antenna is transferred to the sidebands of the optical carrier by an electro-optic modulator,and then transmitted through the optical fiber.Fiber Bragg grating filters are subsequently used to suppress the optical carrier and a photo-detector is used to detect the energy in the remaining sideband.The output signal of the photo-detector is detected by a lock-in amplifier to improve the sensitivity.The energy conversion efficiency and noise characteristics in the millimeter-wave signal processing are discussed.The millimeter-wave detection experiment based on this technique was implemented using a 50 GHz millimeter-wave source.The conversion efficiency and the noise equivalent power were measured.The methods for improving the sensitivity were proposed.A millimeter-wave radiometric detection system was designed.The detection experimental results show that this millimeter-wave signal processing method is effective for millimeter-wave radiometer.

关 键 词：毫米波辐射计 电光调制 光电探测 锁相放大器 灵敏度 微波光子学 

分 类 号：TP732[自动化与计算机技术—检测技术与自动化装置]