基于VCSEL激光器的甲烷和二氧化碳检测系统设计

Design of methane and carbon dioxide detection system based on VCSEL laser

近年来,对温室气体的浓度监测常常选用无人机等设备,无人机可以携带气体检测仪在高空环境下对气体进行移动监测。本文针对无人机设备集成的需求,基于小体积、低功耗的新型VCSEL光源研制了“时分复用”型甲烷和二氧化碳双气体检测系统。系统选用STM32H750作为系统主控,为VCSEL设计了专用的驱动电路和温控电路,用模拟开关切换驱动信息,实现了对气体浓度的分时检测。此外,专为系统设计了上位机界面。将浓度数据通过串口上传至上位机后,可以将数据绘制成可视化图表。经过实验测试,系统稳定性高于95.3%,系统稳定性好,显示界面直观。系统指标满足设计需求。

In recent years,the concentration monitoring of greenhouse gases is often used by unmanned aerial vehicle,which can carry gas detectors to monitor the gases in a high-altitude environment.According to the requirements of UAV,this paper developed a"time division multiplexing"methane and carbon dioxide detection system based on a small-volume and low power consumption VCSEL light source.The system chooses STM32 H750 as the main control.A drive circuit and a temperature control circuit were designed for the VCSEL laser.Time-sharing detection of the gas concentration can be achieved by switching the drive information with an analog switch.In addition,the upper-computer interface is designed for the system.After the concentration is uploaded through the serial port,the data can be drawn into a visual chart.The system stability is higher than 95.3%.The system stability is good,the display interface is intuitive,and the system indicators meet the system design demands.