探测微弱信号的双楔形干涉仪的结构分析

Structure Analyzing of Orthogonal Two-Wedge Interferometer to Detect Weak Laser Signal

  • 摘要: 针对楔形多光束干涉仪产生等间距细锐条纹的特性,结合双路探测系统相减可消去背景噪声的优点,提出一种新型的正交双楔形干涉仪结构。该结构中所有部件都相对固定,且两路楔形板厚度差为一定值,激光入射时,两路干涉仪产生相位差为p/2的等间距条纹,条纹信号叠加在背景噪声信号之上,通过差分放大,使背景非相干光信号相减为零,提高了系统在强噪声背景下弱信号探测能力。该结构可用于微弱激光信号的探测,并能通过条纹间距计算出入射激光的波长。根据该干涉仪的基本原理,通过计算机仿真设计了其结构参数。

     

    Abstract: A new strueture of two orthogonal wedge interferometers is proposed by combining the properties of wedge multi-beams interferometers and two-ways detecting systems. All of the components are fixed, and the thickness difference of two interferometers is designed in a fixed value, which could make their fringe patterns have a fixed phase shift of p/2 when laser beams incoming. Two signals were subtracted through a differentiating amplifier. The background noise, which is superimposed on the fringe signals, could be removed and result in higher contrast ratio fringe signals. The proposed structure could be used in detecting weak laser signal in high background noise, and the wavelength of incident laser beams could be calculated simultaneity. The optical parameters were analyzed by computer simulation.

     

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