激光测速系统中驱动电路的研究

激光测速技术的主要方法有脉冲法和相位法。由于激光相位法测速系统设计复杂,成本较高,因此只考虑脉冲法激光测速。针对脉冲法激光测速,提出了两种易于实现的脉冲驱动电路的设计方法,方法一基于555振荡电路和CPLD,主要利用了CPLD的逻辑延时;方法二完全基于CPLD的逻辑实现。逻辑分析和仿真结果证明,两种方法都可以驱动激光器工作,产生的驱动脉冲的频率和脉宽均可调节。

Study of Driver Circuit in Laser Velocimetry System

The pulsed - laser measurement technique and laser Doppler measurement technique are widely used I laser velocimetry. Due to the complex design and high cost of the laser phase measurement technique, this paper deals only with the pulsed - laser measurement technique. Based on the pulsed - laser measurement, two new methods for designing the driver circuit are presented, both of which are easy to realize. Method One is based on the 555 self-oscillating circuit and CPLD and utilizes the logic delay circuit, while Method Two is based entirely on the logical implementation of CPLD. Simulation and analysis results show that both methods can drive the laser circuit and that the frequency and width of the driving pulse can be adjusted.