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新型光室结构的主流式NDIR呼吸CO2监测系统
引用本文:熊涛,高明,Des Gibson,David Hutson.新型光室结构的主流式NDIR呼吸CO2监测系统[J].红外与激光工程,2020,49(6):20190575-1-20190575-9.
作者姓名:熊涛  高明  Des Gibson  David Hutson
作者单位:1.西安工业大学 光电工程学院,陕西 西安 710021
基金项目:陕西省重点实验室项目;装备预研项目
摘    要:针对主流式非分散红外(NDIR)呼吸CO2监测系统灵敏度及信噪比低下的问题,提出利用复合抛物面聚光器(CPC)提升监测系统性能的方法。利用ZEMAX模拟光室并优化CPC和常用的圆管聚光器以及锥形聚光器,采用单光源双光路的主流式一体化方法进行监测系统的气室设计,以STM32F100为主控芯片实现硬件系统控制,对具有不同光室结构的监测系统进行CO2浓度标定和实时人体呼吸检测实验,获取其CO2浓度与系统输出信号的对应关系和CO2波形图。结果表明,CPC光室其模拟光学效率为4.3%,比常用的聚光器最高可提升89.77倍;装有CPC的监测系统其灵敏度与信噪比为8.940 7、24.65,比装有常用聚光器的系统的灵敏度最高可提升3.811倍、信噪比提升1.926倍;并且安装CPC的系统运行稳定,响应快,能够实时的反应出被测者的呼吸CO2波形图。

关 键 词:呼吸CO2监测    复合抛物面聚光器    非分散红外    光室
收稿时间:2020-03-05

Mainstream NDIR breathing CO2 monitoring system based on new light chamber structure
Affiliation:1.Institute of Optoelectronic Engineering, Xi'an Technological University, Xi'an 710021, China2.Institute of Thin Films, Sensors and Imaging, University of the West of Scotland, Paisley, PA12BE, United Kingdom
Abstract:Aiming at the problem of low sensitivity and low signal-to-noise ratio of mainstream non-dispersive infrared (NDIR) breathing CO2 monitoring systems, the method using a compound parabolic concentrator (CPC) to improve the performance of the monitoring system was proposed. ZEMAX was utilized to simulate optical chambers, optimize CPC and commonly used straight cylinder concentrator and cone concentrator. The mainstream integrated method of single source and double light path was used to design the chamber of the monitoring system. STM32F100 was selected as the main control chip to control the hardware system. CO2 concentration calibration and real-time human breathing detection experiments were performed on monitoring systems with different optical chamber structures, and the corresponding relationship between CO2 concentration and system output signals and CO2 waveform diagrams were obtained. The results show that the CPC optical chamber has a simulated optical efficiency of 4.3%, which can be up to 89.77 times higher than commonly used concentrators; the monitoring system equipped with CPC has a sensitivity and signal-to-noise ratio of 8.940 7 and 24.65, which can increase the sensitivity by up to 3.811 times and the signal-to-noise ratio by 1.926 times compared to systems equipped with common concentrators; And the system installed with CPC runs stably, responds quickly, and can display the capnogram of the subject in real time.
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