Design and Availability Research of a Flammable and Explosive Volatiles Monitoring and Early Warning System（FEVMEW） for the Bus Crowded Places
作者单位：Anhui Xin'he Defense Equipment Technology Joint Co.Ltd. Institute of Intelligent Machines (IIM)Hefei Institutes of Physical Science (HIPS)Chinese Academy of Sciences (CAS)
会议日期：2021年
学科分类：08[工学] 082303[工学-交通运输规划与管理] 082302[工学-交通信息工程及控制] 0823[工学-交通运输工程]
关 键 词：Flammable and Explosive Volatiles Monitoring and Early Warning Bus Crowded Places Gas Sensitive MEMS Chip Airflow Regulating
摘 要：In order to reduce the arson or accidental fire losses, we developed a gas sensitive detector used for the rapid detection and early warning of flammables in crowded places such as buses. A MEMS（Micro-Electro-Mechanical System） based thin film semiconductor was fabricated as the gas sensor. To obtain the target gas selective response, the surface of the sensitive film was modified with highly active metal catalytic nano-particles. Thus the anti-interference ability was improved and the false alarm rate was effectively reduced. Furthermore, the modular embedded system for information acquisition and transmission was developed. Supported by the Airflow Precision control system（APs）, the rapid warning of volatile gas of flammable substances was realized. Experiments showed that RAs has satisfied selectivity to volatiles of usual flammable liquid, such as the output voltage reaches 3 V（0-3.3 V）. With simulation about the actual installation state in bus, MWs sounds an alarm at 2 minutes after splashing 50 mL 92# petrol to the floor. For the last two years, FEVMEW has been integrated into more than 4000 buses in Hefei. This design has been proved feasible according to the actual operation.