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The Driver Circuit and Focusing Lens Designed for the Laser Range-Finder

机译：专为激光测距仪设计的驱动电路和聚焦透镜

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This paper has partitioned the laser range-finder into two parts: one is the laser diode (LD) driver circuit and the other is the focusing lens. The LD's surface temperature rise will affect the LD's light-power simultaneously when an LD works in a steady current. For this reason, we designed a driver circuit to control the LD's light power to be effective and so as to freely adjust the LD's brightness. There are three parts in driver circuit: the regulated power circuits, the regulated current circuit, and the limited current circuit. This investigation used a power meter to measure the LD's power which was relative to the surface temperature. Then the experimental results were compared with the PSpice simulation, and the differences between the result and the simulation were eventually analyzed. The limited current circuit is an important part in our systems because the LD is easily damaged when active current is unstable. Similarly, the surface temperature would be raised after the LD is working for a while which results in the circuit failure. If the LD has worked for a very long time, the heat generated in the circuit should be taken care of. Therefore, we added an automatic power control circuit (APC) into the LD driver circuit in order to reduce the impact of heat. The emitted distance of laser beam could be up to 10 meters with adjusted focusing lens. The laser spot was extended into an ellipse before focusing laser beams. Therefore, we had to put a focal lens to shape the the laser spot into a circular spot. During this experiment, the LD did not work directly without installing the heat sink. Otherwise, the high temperature would damage LD immediately.
机译：本文将激光测距仪分为两部分：一个是激光二极管（LD）驱动器电路，另一个是聚焦透镜。当LD工作在稳定电流下时，LD的表面温度升高将同时影响LD的光功率。因此，我们设计了一个驱动电路来控制LD的光功率有效，从而自由地调整LD的亮度。驱动器电路由三部分组成：稳压电源电路，稳压电流电路和限流电路。这项研究使用功率计来测量相对于表面温度的LD功率。然后将实验结果与PSpice仿真进行比较，并最终分析了仿真结果与仿真结果之间的差异。限制电流电路是我们系统中的重要组成部分，因为当有功电流不稳定时，LD很容易损坏。同样，LD工作一段时间后，表面温度会升高，这会导致电路故障。如果LD工作了很长时间，则应注意电路中产生的热量。因此，我们在LD驱动器电路中增加了一个自动功率控制电路（APC），以减少热量的影响。调焦透镜，激光束的发射距离可达10米。在聚焦激光束之前，将激光光斑扩展成椭圆形。因此，我们必须放置一个聚焦透镜以将激光光斑整形为圆形光斑。在此实验中，LD没有安装散热器就无法直接工作。否则，高温会立即损坏LD。

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