Dong Ming, Zheng Chuantao, Miao Shuzhuo, Zhang Yu, Du Qiaoling, Wang Yiding, Tittel Frank K
State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China.
Electrical and Computer Engineering Department, Rice University, 6100 Main Street, Houston, TX 77005, USA.
Sensors (Basel). 2017 Sep 27;17(10):2221. doi: 10.3390/s17102221.
A multi-gas sensor system was developed that uses a single broadband light source and multiple carbon monoxide (CO), carbon dioxide (CO₂) and methane (CH₄) pyroelectric detectors by use of the time division multiplexing (TDM) technique. A stepper motor-based rotating system and a single-reflection spherical optical mirror were designed and adopted to realize and enhance multi-gas detection. Detailed measurements under static detection mode (without rotation) and dynamic mode (with rotation) were performed to study the performance of the sensor system for the three gas species. Effects of the motor rotating period on sensor performances were also investigated and a rotation speed of 0.4π rad/s was required to obtain a stable sensing performance, corresponding to a detection period of ~10 s to realize one round of detection. Based on an Allan deviation analysis, the 1 detection limits under static operation are 2.96, 4.54 and 2.84 parts per million in volume (ppmv) for CO, CO₂ and CH₄, respectively and the 1 detection limits under dynamic operations are 8.83, 8.69 and 10.29 ppmv for the three gas species, respectively. The reported sensor has potential applications in various fields requiring CO, CO₂ and CH₄ detection such as in coal mines.
开发了一种多气体传感器系统，该系统通过时分复用（TDM）技术，利用单个宽带光源以及多个一氧化碳（CO）、二氧化碳（CO₂）和甲烷（CH₄）热释电探测器。设计并采用了基于步进电机的旋转系统和单反射球面光学镜，以实现并增强多气体检测。在静态检测模式（不旋转）和动态模式（旋转）下进行了详细测量，以研究该传感器系统对这三种气体的性能。还研究了电机旋转周期对传感器性能的影响，为获得稳定的传感性能，需要0.4π弧度/秒的转速，这对应于约10秒的检测周期以实现一轮检测。基于阿伦偏差分析，静态操作下CO、CO₂和CH₄的检测限分别为2.96、4.54和2.84体积百万分比（ppmv），动态操作下这三种气体的检测限分别为8.83、8.69和10.29 ppmv。所报道的传感器在需要检测CO、CO₂和CH₄的各种领域（如煤矿）具有潜在应用。
