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采用同一电光器件对发射和接收光束同时开关的原理,提出了一种新颖的激光测距方法。光源发出的连续激光被待测目标反射后,往返两次通过光源端的电光晶体,在晶体上施加边沿急速变化的电压,利用其高速响应的开关特性,同时对往返光线产生影响,截取出一段包含激光往返待测距离所需时间信息的光强变化曲线。实验中利用雪崩管电路实现了纳秒级的高压上升沿,并利用单轴晶体的双折射和全内双反射性质,用特殊结构的单块LiNbO3晶体实现了该方法的测距装置。示波器分析的实验结果验证了该方法的可行性,从而为激光测距开拓了一种新的思路。
A novel laser ranging method is proposed based on the principle that the same electro-optical device switches the transmitting and receiving beams at the same time. After the continuous laser emitted by the light source is reflected by the target to be measured, it reciprocates the electro-optic crystal passing through the light source twice to impose a sharp voltage change on the crystal. By utilizing its high-speed switching characteristics and simultaneously affecting the reciprocating light, The curve of the light intensity of the time required for the laser to travel from the distance to be measured. In the experiment, the avalanche tube circuit is used to realize the nanosecond high voltage rising edge, and the birefringence and the all-internal birefringence property of the uniaxial crystal are utilized to realize the distance measuring device of a single LiNbO3 crystal with a special structure. The experimental results of the oscilloscope analysis verify the feasibility of the method, which opens up a new idea for laser ranging.