二维相敏检波器及其在调幅图像解调中应用  

Two-dimensional phase sensitive detector and its application to demodulating amplitude modulated image

作　　者：刘懿 郝思忠[2] 田玉琳[2] 刘国忠[3,4] Liu Yi;Hao Si-Zhong;Tian Yu-Lin;Liu Guo-Zhong(College of Materials Science and Engineering,Sichuan University,Chengdu 610207,China;No.33 Research Institute,China Electronics Technology Group Corporation,Taiyuan 030006,China;School of Instrumentation Science and Opto-electronics Engineering,Beijing Information Science and Technology University,Beijing 100192,China;Institute of Precision Measuring Technology and Instruments,Beijing Information Science and Technology University,Beijing 100192,China)

机构地区：[1]四川大学材料科学与工程学院,成都610207 [2]中国电子科技集团公司第三十三研究所,太原030006 [3]北京信息科技大学仪器科学与光电工程学院,北京100192 [4]北京信息科技大学精密测试技术与仪器研究所,北京100192

出　　处：《物理学报》2019年第22期310-321,共12页Acta Physica Sinica

基　　金：北京市自然科学基金(批准号:7172035)资助的课题~~

摘　　要：采用二维空间调制解调技术可以提高低照度及高噪声环境条件下光电探测目标对象的能力,本文提出了对二维空间调幅信号进行高精度检波的二维相敏检波器(two-dimensional phase-sensitive detector,2D PSD)方法.介绍了二维相敏检波器提取二维调幅图像中调制信号的工作原理,并对二维相敏检波器抑制噪声、从噪声淹没的调幅图像中提取信号的能力进行了模拟仿真;为消除屏蔽玻璃中金属丝网产生的网格调幅图像对屏蔽玻璃缺陷检测的影响,对比分析了频域直接滤波方法、整流加滤波方法和二维相敏检波器等方法对调幅图像进行检波、提取缺陷和抑制噪声的效果.介绍了通过外加载波和二维相敏检波方法检测普通玻璃缺陷的原理和实验结果.模拟仿真及实际检测结果表明二维相敏检波方法可用于空间二维调幅图像解调,大大提高输出图像的信噪比,具有提取淹没在噪声中的调幅图像中调制信号的能力,提高检测精度.Two-dimensional spatial modulation and demodulation technology can improve the weak signal detection capability of photoelectric detection system in a stronger noise background.In this paper,a two-dimensional phase-sensitive detector for the high-precision demodulation of 2 D spatial amplitude-modulated signal is proposed.In this paper,we introduce the principle of extracting modulating signals from 2 D amplitude modulated images by using 2 D phase-sensitive detector,and simulate its ability to suppressing noise and extracting signal from the amplitude-modulated images buried in noise.In order to eliminate the influence of grid image generated by metal wire mesh sandwiched between two layers of glass on the detection of shielding glass defects,the methods of filtering in the frequency domain,rectifying plus filtering and two-dimensional phase sensitive detector are used to demodulate the mesh amplitude-modulated image,and the effects of extracting defects and suppressing noise are compared with each other.The principle and experimental results of defect detection of ordinary glass by using external carrier are also provided.The simulation results and the detection results show that the two-dimensional phase-sensitive detector can be used to demodulate spatial two-dimensional amplitude-modulated image produced by optical modulators to extract two-dimensional measurement signals.The 2 D phase-sensitive detector can greatly improve the signal-to-noise ratio of the output image,increase detection accuracy and the ability to extract modulating signals from the amplitude-modulated image buried in noise.

关 键 词：二维相敏检波器 二维调幅图像 信噪比 玻璃缺陷检测 

分 类 号：TN9[电子电信—信息与通信工程]