采用四象限探测器检测干涉条纹正交信号的新方法  

New Method for Detecting Orthogonal Signals of Laser Interference Fringes Using Four-Quadrant Detector

作　　者：黄强辉[1] 曹益平[1] 

机构地区：[1]四川大学光电科学技术系,四川成都610064

出　　处：《中国激光》2009年第5期1166-1170,共5页Chinese Journal of Lasers

基　　金：国家863计划(2007AA01Z333);四川省科技攻关项目(2006Z01-028);四川省学术和技术带头人培养基金资助课题

摘　　要：将四象限探测器应用于激光干涉的测量领域,提出一种检测激光干涉条纹正交信号的新方法。利用叫象限探测器的探测区域象限化特征,以及干涉条纹在探测单元内的矢量叠加原理,实现了干涉条纹的正交信号检测。实验表明,通过改变四象限探测器的旋转角度,可以简便地检测到条纹的正交信号。当检测不同周期的干涉条纹时只需旋转四象限探测器至适当角度,就可检测到相应周期干涉条纹的正交信号,并且采用了差分技术处理信号,从而有效地抑制了外界环境产生的噪声。与传统检测方法相比具有易于操作、抗干扰能力强等优点。A new method for detecting orthogonal signals of laser interference fringes based on four-quadrant detector is presented. Using the quadrant characteristic of four-quadrant detector and the vector superposition principle of the cosinusoidal interference fringe distribution within the detected region, the orthogonal signals for fringes has been detected successfully. The experimental results show that the orthogonal signals of fringes can be detected expediently by rotating the four-quadrant detector around its center. When the other interference fringes with different period is detected, the orthogonal signals of fringes can also be obtained easily only by rotating the four-quadrant detector to another orientation. In order to adopted in signal processing. Compared to the traditional restrain noise effectively, a difference technique has been detection method, this method is easy to operate and has strong anti-jamming ability.

关 键 词：激光技术 正交信号 激光干涉 四象限探测器 差分技术 

分 类 号：TN247[电子电信—物理电子学]