摘要
传统用于呼吸二氧化碳(Carbon Dioxide,CO_(2))监测的非分光红外(Non-Dispersive Infra-Red,NDIR)白炽灯和热电堆或热释电组合探测的方法需增加滤光片以降低由光谱较宽引起的交叉敏感度,同时需进行温度补偿和控制,具有测量范围小、系统复杂度高和误差来源较多的问题。鉴于此,文中设计了基于NDIR原理的双中红外发光二极管(Light Emitting Diode,LED)和光电二极管(Photo-Diode,PD)探测器组合的主流式CO_(2)分压监测系统。其采用模拟前端AFE4900同步完成LED驱动和PD接收,实时性高,无需传统探测器输出信号解调步骤;利用双LED和单PD组合代替滤波片,降低交叉敏感度;具有频谱集中的特点,无需温度控制以及额外补偿,可实现宽范围、准确测量。实验结果表明,新型的光电二极管探测技术的CO_(2)气体传感器系统的CO_(2)测量浓度为0~152 mmHg,误差为8.143 mmHg。
It is necessary to use filters to eliminate the cross-sensitivity due to the broad spectrum of incandescent lamps and to compensate and control the working temperature for the traditional high-sensitivity monitoring of Carbon Dioxide(CO_(2))in breathing which is measured by the combination of NonDispersive Infra-Red(NDIR)incandescent lamps and thermopile or pyroelectric.It has the disadvantages of small measurement range,system complexity and more sources of error.In order to solve this problem,in this paper,a mainstream Carbon Dioxide(CO_(2))monitoring system is designed on the basis of the principle of NDIR with the dual mid-infrared Light Emitting Diode(LED)and Photo-Diode(PD)light sources.In the design system,the LED drive and PD reception are synchronously completed with the analog front end AFE4900 which cancels the step of output signal demodulation in traditional detector and has the merits of fast response,high real-time performance and ability of decrease the cross-sensitivity.The system can function well without controlling temperature and extra compensation due to the concentrated frequency spectrum of LED,and has the characteristics of wide measurement range and accurate measurement.It is shown by the experimental results that the CO_(2)gas sensor system with the new photodiode detection technology can measure CO_(2)concentration in the range of 0~152 mmHg with an error of 8.143 mmHg.
作者
付艺铖
夏攀
王鹏
周瑞石
方震
FU Yicheng;XIA Pan;WANG Peng;ZHOU Ruishi;FANG Zhen(School of Microelectronics,University of Chinese Academy of Sciences,Beijing 100049,China;State Key Laboratory of Transducer Technology,Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100190,China)
出处
《电子设计工程》
2022年第8期36-41,51,共7页
Electronic Design Engineering
