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大气湍流运动频率一般在几赫兹到几百赫兹之间变化,激光在大气中传输时将受到此种运动的调制,调制的结果将对接收到的光斑能量分布形式与光斑形状产生影响,光斑能量与形状的变化将对象限探测器(QD)的输出产生影响。设计了一种湍流环境下的光斑检测后续处理电路,该电路使用两级增益系统,初级增益主要抑制噪声,二级增益使用可变增益放大,实现对象限探测器输出信号的有效放大与处理。搭建实验系统来完成湍流环境下的器件性能测试,当测试距离为830m时,完成不同信噪比、光斑大小、调制信号对探测器影响的测试;当测试距离为12.5km时,象限探测器没有细分能力,噪声占据整个光敏面,失去光斑检测的能力,使用数字滤波可以提高其细分能力。
Atmospheric turbulence frequency generally varies from a few hertz to several hundred hertz. When the laser is transmitted in the atmosphere, it will be modulated by such motion. The modulation result will affect the received light spot energy distribution and spot shape. The spot energy The change in shape affects the output of the Object Limit Detector (QD). A follow-up processing circuit for spot detection in turbulent environment is designed. The circuit uses two-stage gain system. The primary gain mainly suppresses noise and the second gain uses variable gain amplification to achieve the effective enlargement and processing of the output signal of the limit detector. The experimental system was built to complete the device performance test in turbulent environment. When the test distance was 830m, the test of different signal-to-noise ratio, spot size and modulation signal on the detector was completed. When the test distance was 12.5km, the quadrant detector did not Subdivision ability, noise occupy the entire photosensitive surface, loss of spot detection ability, the use of digital filtering can improve its segmentation ability.