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脉冲激光测距仪的瞄准和接收光轴之间平行度,在室外对“T”形目标的实测方法,已有文章说明(见《光学技术》82-2)。本文介绍这两者平行度的一种在实验室内进行的光电测量方法。在脉冲激光测距仪中,以雪崩光电二极管作为光电转换元件的接收器。由于雪崩管的偏置电压与等效输入噪声电流曲线,在不同的温度条件下位置变化很大(也即雪崩拐点对应的偏置电压变化很大),所以都配有雪崩管偏压自动调节电路。当测距仪处于预测距状态时,外界的气温、光和电的噪声,综合起来以输入噪声的形式加在比较器的一个输入端上,接收器根据设计的信噪比要求,自动调节雪崩管偏
Pulsed laser range finder aiming and receiving parallelism between the optical axis, the outdoor “T” shape of the target measurement methods, the article has been described (see “Optics” 82-2). This article describes the parallelism of the two in the laboratory for a photoelectric measurement method. In the pulsed laser range finder, an avalanche photodiode is used as the receiver of the photoelectric conversion element. Because of the avalanche tube bias voltage and the equivalent input noise current curve, the position changes greatly under different temperature conditions (that is, the avalanche inflection point corresponding to the bias voltage varies greatly), so they are equipped with avalanche tube bias automatic adjustment Circuit. When the range finder is in the foreground, the ambient temperature, light and electricity noise are combined in the form of input noise at one input of the comparator, and the receiver automatically adjusts for the avalanche according to the designed signal-to-noise ratio Tube deviation