本质安全型低照度视频采集激光辅助光源设计  

Design of intrinsically safe laser auxiliary light source for low-illumination video acquisition

作　　者：李文峰[1] 蔡蓬勃 LI Wenfeng;CAI Pengbo(College of Communication and Information Engineering, Xi'an University of Science and Technology, Xi'an 710054, China)

机构地区：[1]西安科技大学通信与信息工程学院,陕西西安710054

出　　处：《工矿自动化》2019年第1期13-17,共5页Journal Of Mine Automation

基　　金：国家重点研发计划资助项目(2017YFC0703204);西安市碑林区科技计划资助项目(GX1812)

摘　　要：针对现有低照度视频采集辅助光源存在功耗高、体积大、照射距离近、隐蔽性差等问题,提出了一种本质安全型低照度视频采集激光辅助光源设计方案。选用光源波长为940nm的半导体激光二极管,利用多模光纤、匀光片和透镜使半导体激光二极管输出光束形状规则、光照强度均匀;本质安全型驱动电路采用恒流驱动方式,具有过压、防反接和防静电保护;通过散热装置降低半导体激光二极管工作温度,使激光辅助光源能长时间稳定工作。测试结果表明,该激光辅助光源照射距离可达20m,功耗小于3 W,持续工作温度低于50℃。For problems of high power consumption,large volume,close irradiation distance and poor concealment of existing auxiliary light source for low-illumination video acquisition,a design scheme of intrinsically safe laser auxiliary light source for low-illumination video acquisition was proposed.The semiconductor laser diode with940nm wavelength of light source is selected,and multi-mode fiber,smoothing glasses and lens are used to realize regular shape and uniform illumination intensity of beam outputted by the semiconductor laser diode.The intrinsically safe driving circuit adopts constant current driving mode with overvoltage,anti-reverse connection and anti-static protection.Working temperature of semiconductor laser diode is reduced through heat dissipation device,so that the laser auxiliary light source can work stably for a long time.The test results show that the laser auxiliary light source with irradiation distance is20m,power consumption is less than3W and continuous working temperature below50℃.

关 键 词：视频监控系统 低照度视频采集 辅助光源 本质安全型 半导体激光二极管 

分 类 号：TD67[矿业工程—矿山机电]