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信号边界检出是激光扫描测量系统实现稳定和高精度测量的关键技术之一.本文对标准电平切割法和二次微分法等边界检出方法的特点进行了分析和比较。基于光电共轭原理,设计了一种可实现光电共轭信号边界检出的新型电路,并使用仿真软件 Multisim 对该电路进行了动态仿真,表明该电路采用测量信号的自共轭函数作为参考基准,通过确定两共轭交点可稳定实现信号的边界检出.实验验证了该甄别电路,具有灵敏度高、自适应特性好的优点。
Signal boundary detection is one of the key technologies in laser scanning measurement system to achieve stable and high precision measurement.The characteristics of boundary detection methods such as standard level cut method and quadratic differential method are analyzed and compared. Based on the principle of optoelectron conjugation, a novel circuit that can detect the boundary of photoconjugate signals is designed. The simulation of this circuit is carried out by using the simulation software Multisim, which shows that the circuit uses the self-conjugate function of the measured signal as a reference , The signal boundary detection can be stably realized by determining the two conjugate intersections.Experimental verification of the screening circuit has the advantages of high sensitivity and good self-adaptability.