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针对窄脉冲激光时域/频域特性,对窄脉冲激光电路设计进行了详细的分析,包括探测器光敏面面元尺寸分析,以及取样电阻、反馈电容对信号带宽和信号完整性的影响等。为了提高探测系统的信噪比、稳定性等要素,对两种典型的光电接口电路进行了理论分析和软件仿真,得到不同的探测器结电容、取样电阻、反馈电容等参数对窄脉冲激光探测电路光电接口带宽、输出信号幅值、脉宽等响应特性的影响。根据不同种类的探测器及脉冲激光探测信号的频率特性,选取不同的偏置与放大电路,可以使前置光电接口电路的性能达到最佳。
Aiming at the characteristics of narrow pulse laser in time domain and frequency domain, the design of narrow pulse laser circuit is analyzed in detail, including the dimension analysis of the photosensitive surface of detector, the influence of sampling resistor and feedback capacitor on signal bandwidth and signal integrity. In order to improve the signal-to-noise ratio and stability of the detection system, theoretical analysis and software simulation of two typical optoelectronic interface circuits are carried out, and different detector junction capacitance, sampling resistance, feedback capacitance and other parameters are obtained for narrow pulse laser detection Circuit optical interface bandwidth, the output signal amplitude, pulse width and other response characteristics. According to different types of detectors and pulsed laser detection signal frequency characteristics, select a different bias and amplifier circuit, you can make the performance of the front optoelectronic interface circuit to achieve the best.