穿戴式实时环境气体监测系统  

A Wearable System for the Real-Time Ambient Gases Monitoring

作　　者：高凡[1] 张希[1] 陈辰星[1] 邹莹畅[1] 安超[1] 郎朗[1] 王平[1] 

机构地区：[1]浙江大学生物医学工程与仪器科学学院生物传感器国家专业实验室生物医学工程教育部重点实验室,杭州310027

出　　处：《中国生物医学工程学报》2015年第6期654-661,共8页Chinese Journal of Biomedical Engineering

基　　金：浙江省重大科技专项(2013C03044-2)

摘　　要：为了更好地监测室内或室外常见的有害气体对人体或环境造成的危害及影响,研制一款基于金属氧化物半导体(MOS)型气体传感器阵列的穿戴式实时环境气体监测系统。设计MOS型气体传感器阵列和小型化硬件检测电路,以便长时间连续实时监测环境中某些有害气体的浓度。选取甲醛、苯和总挥发性有机化合物(TVOC)等典型的环境有害气体作为初步检测对象,通过检测标准浓度的气体确定系统检测范围(0.01~0.5 mg/m3),分析稳态峰值与对应浓度的相关性,绘制拟合曲线并作为标定方程,考虑斜率和拟合程度(R^2)同时较大为最优,选择检测使用的传感器。选取多场景进行环境监测实验,通风橱模拟小空间封闭环境,实验室模拟室内环境。系统可记录所在位置的甲醛、苯或TVOC的浓度值,实现多挥发源复杂环境中检测不同浓度的有害气体,并可进行声光报警。在校园室外场景中,随系统移动记录不同位置的TVOC浓度以绘制浓度空间图谱,可观测和分析大数据。传感器响应稳定时间为30 s,系统可任意设置大于30 s的数据发送间隔,把目标气体浓度通过蓝牙上传至手机,数据也可通过串口传输至上位机。该穿戴式系统有望应用于车内污染、室内装潢、室外环境等有害气体的实时和快速监测中。In order to monitor the indoor or outdoor hazard gases and evaluate the harmful impact of these gases to humans and environment,this study developed a wearable mobile system for the real-time ambient gases monitoring based on the metal oxide semiconductor（ MOS） sensors array. We designed and produced a miniaturized hardware circuit to detect the sensor signals. The system can detect the real-time concentration of these environmental toxicants continuously for a long time. This study selected formaldehyde,benzene,total volatile organic compound（ TVOC） as typical harmful gases for a preliminary test. The threshold range（ 0. 01- 0. 5 mg / m^3） was determined by detecting the standard gas. The correlation between the steady-state peak values and the corresponding concentration was analyzed,and the fitting curve was plotted as the calibration equation. We selected the detection sensors depending on the slope and fitting degree（ R^2） were both the best. Experiments of environmental monitoring were performed in multi-scene applications. The fuming cupboard simulated small closed space and the laboratory simulated indoor environment. The system can record the local concentration of formaldehyde,benzene or TVOC and achieve the goal of detecting the harmful gases in volatile environment with wave multi-sources and giving out sound and light alarm. The TVOC concentration can also be detected in different positions to draw the concentration space map for observing and analyzing big data while the system was moving in the outdoor campus. The sensor stable response time was 30 s and thesystem can set the data transmission interval at more than 30 s. The target gas concentration was transferred to one＇s smartphone via the Bluetooth or to one＇ s computer via the serial port. We believe that this design has potential of being used in real-time detection of the environmental target gases in cars,indoor,outdoor and other scenes.

关 键 词：穿戴式仪器 实时移动监测 MOS传感器阵列 环境气体检测 

分 类 号：R318[医药卫生—生物医学工程]