摘要
由于火灾阴燃过程会产生二氧化碳(CO_(2))气体,故采用基于非色散红外(non-dispersion infrared,NDIR)原理的火灾预警系统来监测CO_(2)浓度来预防火灾事故。该预警系统基于中红外吸收光谱技术,利用CO_(2)气体分子在4.26μm处的基频吸收带,结合红外宽带热光源和双通道热释电探测器,实现了中红外CO_(2)的高灵敏检测。利用配备的CO_(2)气体样品,研究了该系统对CO_(2)气体的传感特性。由于需要将火灾预警系统放在农业机械上工作,机械振动会影响系统光路结构,因此需要对装置进行减振处理。基于杜哈梅积分模型及其在求解振动系统响应问题上的应用,设计了一种减振装置,并对该装置进行了建模仿真,结果显示振动幅度减少了82%。将该减振装置进行室外振动测试,结果显示仪器振动幅度减小了86%~87%,采用减振装置时CO_(2)测量浓度的方差相较未采用减振装置时减小了50.01%,不确定度降低了29.52%。仿真分析及室外振动实验结果表明,该减振系统的减振效果良好,具有性价比高、减振结构简单等优势,具有工程应用价值。
Carbon dioxide(CO_(2)) is produced during the fire smoldering process;thus,a fire alarm system based on non-dispersive infrared(NDIR) is employed to monitor the CO_(2) concentration to prevent fire accidents.Using the fundamental absorption band of CO_(2) molecules at 4.26 μm and mid-infrared absorption spectroscopy,the early fire alarming system uses an infrared broadband heat source and dual-channel pyroelectric detector to achieve highly sensitive CO_(2) detection.Using prepared CO_(2) gas samples,the sensor characteristics of the CO_(2) sensor system are studied.Early fire alarm system must work with agricultural machinery;thus,the sensor must be damped.Based on the model and application of the Duhamel integral in solving vibration system response,a vibration damping module is designed,and the damping structure is modeled and simulated.The results demonstrate that the vibration amplitude is reduced by 82%.The outdoor vibration test of the damping module demonstrates that,when using the damping module,the vibration amplitude of the instrument is reduced by 86%-87%,and the measurement variance of CO_(2) concentration is reduced by 50.01% and the uncertainty is reduced by 29.52% compared to the case when the damping module is not used.Simulation analysis and outdoor vibration experiment results demonstrate that the damping module provides good vibration reduction effect with the advantages of high cost-performance,simple vibration reduction structure,etc.,and is of obvious value in engineering applications.
作者
王俊博
马卓
李亚飞
郑传涛
王一丁
Wang Junbo;Ma Zhuo;Li Yafei;Zheng Chuantao;Wang Yiding(State Key Laboratory of Integrated Optoelectronics,College of Electronic Science and Engineering,Jilin University,Changchun,Jilin 130012,China;Jilin Provincial Engineering Research Center of Infrared Gas Sensing Technique,Changchun,Jilin 130012,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2021年第23期371-378,共8页
Laser & Optoelectronics Progress
基金
国家重点研发计划(2016YFD0700101)
国家自然科学基金(61775079,61627823,61960206004)
吉林省科技发展计划(20180201046GX,20190101016JH,20200401059GX)。
关键词
光谱学
中红外吸收光谱
CO_(2)检测
减振设计
系统稳定性
spectroscopy
mid-infrared absorption spectroscopy
CO_(2)detection
vibration reduction design
system stability
