具有抗干扰功能的激光测距电路的设计与实现

Design and implementation of laser ranging circuit with anti-interference function

传统激光测距电路大部分为模拟电路,其结构单一,抗干扰性能弱,容易产生误检问题,极大降低了激光测距的准确度。为此,设计并实现具有抗干扰功能的激光测距电路,其对OPT301光电二极管的电流进行调制,实现激光信号的调控,抑制噪声干扰。设计内光路采集放大电路的放大倍数是1000,采用RC滤波网络对噪声宽度进行压缩,限制电路噪声,并且通过共源场效应管消除噪声,提高检测精度;设计外光路采集放大电路采集远距离激光信号,通过对两级放大电路进行放大处理,提高远距离激光信号的强度,抑制噪声干扰。给出了激光测距电路系统的实现过程。实验结果说明,该电路能够对不同距离进行准确检测,具备较强的抗干扰性能和检测精度。

Most traditional laser ranging circuits are analog circuits which have single structure, weak anti-inter- ference performance, are easy to generate false detection, greatly reduce the accuracy of laser ranging. Therefore, this paper put forward the design and implementation of laser ranging circuit with anti-interference function. It modulates the current of OPT301 photoelectric diode to realize the control of laser signal and suppress the noise interference. Design the inner light path collection amplifying circuit magnification is 1000 times. The RC filtering network was adopted to compress noise width and limit circuit noise. And noise was eliminated through common source field effect tube to improve the detection accuracy; the outer light path collection amplifier circuit was designed to collect long distance la- ser signal. Increase the intensity of the laser signal over a long distance and suppress noise interference through enlarging the two-stage amplifier circuit. Finally the implementation process of laser ranging circuit system is given. Experimental results indicate that the circuit can accurately detect in different distances, has strong anti-interference ability and precision.