Conference Paper

Design a wireless sensor network for methane monitoring system

School of Mechanical Engineering, Xi¿an Jiaotong University, Japan
DOI: 10.1109/INDIN.2008.4618174 Conference: Industrial Informatics, 2008. INDIN 2008. 6th IEEE International Conference on
Source: IEEE Xplore

ABSTRACT Automatic calibration technologies were useful at reducing the impacts of methane sensorpsilas stability that led to shortcomings of traditional gas detector, such as frequent recalibration, high maintenance cost, and high false alarm rate. This paper described a mini intelligent methane sensor to be used as a sensing node to form a real-time methane monitoring network based on nRF240. Moreover, a novel auto-calibration method is proposed to achieve the maintenance-free operation using the sensor network and achieved the auto diagnosis, and automatic dynamic correction of sensor nonlinear characteristic. This paper introduced the principle of the method, the hardware and software of the composing module. The network connectivity can be used not only for methane data collection but also for the calibration and diagnosis of the sensors through data processing of the nearby sensing node, which provided the effective supporting for automatic calibration of the single intelligent methane detector. An intelligent methane sensor system equipped with the network connectivity can perform the calibration autonomously in the field, and there is no need to prepare standard gases for each system as in the conventional calibration.

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    ABSTRACT: This paper introduced a visual calibrating technology for the intelligent methane detection system. For the human factors, the calibration has prevented the methane detection system from being widely used. The technology and device for communication interface were designed based on PC and ATmega48V. The system display calibration curve of concentration in real-time, achieves the automatic and visualized calibration process of the intelligent methane alarm system, significantly reduce the heavy workload and maintenance cost in calibration process. The automatic calibration based on WSN is also introduced. The results show that the techniques to be the effective and efficient way to lighten workload on calibration and to improve the calibration accuracy. Keywords-Methane detection; MCU; EEPROM; Visualization calibration;WSN
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    ABSTRACT: Wireless sensor prototypes have varying hardware architectures and distinctive sensing principles. In this study, a prototype is developed for the purpose of monitoring leaks of methane (CH 4), which has explosive properties and is the main constituent of the natural gas, in the refineries or buildings and work places heating. The prototype can be mounted on the walls as well as it is portable. System is composed of the integration of methane gas sensor module NGM2611 to MicaZ mote. The sensor module is pre-calibrated and is a product of FIGARO firm. The MICAz is a 2.4 GHz, IEEE/ZigBee 802.15.4; board used for low-power, wireless and sensor networks. By means of the designed sensor prototypes, wireless sensor networks are established indoors; hence, methane gas leaks are detected and sent to the base stations. Data received by base station is monitored by the software on a computer connected to the base station. This study explains the system structure, parts of hardware and software design in detail. The aim of the system is to implement a wireless methane gas platform. This platform can be used to real time monitoring of the methane leaks which would be crucial for critical conditions and helpful to decrease risk of death due to those leaks.
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    ABSTRACT: Wireless Sensor Network (WSN) used under the coalmine tunnel is an emerging area of research that promises to provide reliable and flexible communication. This paper first discussed the best working frequency about the WSN in coalmine. Then, according to the actual circumstances of coal mine, the network structure should adopt cluster-tree topology. We also develop a multifunction communication wireless system using ZigBee and WiFi technology, which can achieve the functions of gas monitoring, wireless communication, personnel management and video surveillance, etc. Practical applications showed that the multifunction communication system can satisfy the need of dispatch communication and safety monitor in the coal mine tunnel.