Electrical Engineering, College of Engineering, Qatar University, P.O. Box 2713, Doha, Qatar.
Department of Information Engineering, Brescia University, 25121 Brescia, Italy.
Sensors (Basel). 2020 Apr 20;20(8):2341. doi: 10.3390/s20082341.
Electrochemical gas sensors require regular maintenance to check and secure proper functioning. Standard procedures usually involve testing and recalibration of the sensors, for which working environments are needed. Periodic calibration is therefore necessary to ensure reliable and accurate measurements. This paper proposes a dedicated smart calibration rig with a set of novel features enabling simultaneous calibration of multiple sensors. The proposed calibration rig system comprises a gas mixing system, temperature control system, a test chamber, and a process-control PC that controls all calibration phases. The calibration process is automated by a LabVIEW-based platform that controls the calibration environment for the sensor nodes, logs sensor data, and best fit equation based on interpolation for every sensor on the node and uploads it to the sensor node for next deployments. The communication between the PC and the sensor nodes is performed using the same IEEE 802.15.4 (ZigBee) protocol that the nodes also use in field deployment for air quality measurement. The results presented demonstrate the effectiveness of the sensors calibration rig.
电化学气体传感器需要定期维护，以检查和确保其正常运行。标准程序通常包括传感器的测试和重新校准，这需要工作环境。因此，需要定期进行校准以确保可靠和准确的测量。本文提出了一种专用的智能校准装置，具有一系列新功能，可同时对多个传感器进行校准。所提出的校准装置系统包括气体混合系统、温度控制系统、测试室和控制所有校准阶段的过程控制 PC。校准过程由基于 LabVIEW 的平台自动化控制，该平台控制传感器节点的校准环境、记录传感器数据，并根据每个节点上的传感器的插值进行最佳拟合方程，然后将其上传到传感器节点以供下次部署使用。PC 和传感器节点之间的通信使用相同的 IEEE 802.15.4（ZigBee）协议，节点在空气质量测量的现场部署中也使用该协议。所呈现的结果证明了传感器校准装置的有效性。
