基于无线传感网络的井下人员定位和瓦斯监测关键技术研究

发布时间：2018-03-13 03:13

本文选题：无线传感网络　切入点：受限空间电磁波　出处：《中北大学》2013年博士论文　论文类型：学位论文

【摘要】：煤矿安全生产和管理是项复杂的系统工程，其中有效的安全防御监测系统是其重要的组成部分，它在矿井安全生产方面起着决定性的作用。本文基于无线传感网络技术，研究和分析了用于煤矿安全井下人员定位和瓦斯监测关键技术，在此基础上建立了基于CC1110的井下SimpliciTI无线监测传感网络系统及红外吸收型瓦斯监测系统。具体有以下几个方面工作：首先以波导理论为基础详细分析了电磁波在矩形和拱形巷道中的传输特性，分析了巷道中各参数对电磁波传输的影响。系统分析了瓦斯浓度检测技术，矿井人员定位技术及无线通信中的帧同步技术，为煤矿安全防御无线监测系统及红外吸收型瓦斯监测系统的建立提供了技术支撑。针对当前煤矿监测系统存在检测范围小、扩展困难的情况，提出了一种基于无线传感网络的新型煤矿安全与预警系统设计方案。该方案采用了射频芯片CC1110作为无线传感器的核心，结合SimpliciTI网络协议与外围极少数元件搭建了射频片上系统（SoC）。实验结果显示，网络中的节点具有传输距离远、可移动、通信稳定等特点，基本实现了对矿区环境参数的自动监测和报警。基于气体红外光谱吸收原理，设计了一款电调制非分光技术的红外瓦斯检测系统。该系统采用单光路双波长技术，以红外LED光源IRL715防尘防水的吸收气室和热释电探测器件LIM-262组成光学探头，利用有源滤波和差分放大电路实现信号调制，采用二项式拟合瓦斯浓度－电压关系曲线，，实现了对瓦斯浓度的精确探测。
[Abstract]:Coal mine safety production and management is a complex system engineering, in which effective safety defense monitoring system is an important part of it, and it plays a decisive role in mine safety production. This paper studies and analyzes the key technologies used in coal mine safety underground personnel positioning and gas monitoring. On this basis, the underground SimpliciTI wireless monitoring sensor network system based on CC1110 and the infrared absorption gas monitoring system are established. Based on the waveguide theory, the transmission characteristics of electromagnetic waves in rectangular and arched roadways are analyzed in detail, and the influence of various parameters on the transmission of electromagnetic waves is analyzed. The gas concentration detection technology, mine personnel location technology and frame synchronization technology in wireless communication are systematically analyzed, which provides technical support for the establishment of wireless monitoring system for coal mine safety defense and infrared absorption gas monitoring system. In view of the situation that the detection range is small and the expansion is difficult in the current coal mine monitoring system, A new design scheme of coal mine safety and early warning system based on wireless sensor network is proposed, in which RF chip CC1110 is used as the core of wireless sensor. Combined with SimpliciTI network protocol and a few peripheral components, a RF on-chip system is built. The experimental results show that the nodes in the network have the characteristics of long transmission distance, removable, stable communication, etc. The automatic monitoring and alarm of environmental parameters in mining area are basically realized. Based on the principle of gas infrared absorption, an infrared gas detection system based on electrically modulated non-optical technology is designed. The optical probe is composed of an infrared LED light source IRL715 dust proof and waterproof absorption chamber and pyroelectric detector part LIM-262. The signal modulation is realized by using active filter and differential amplifier circuit. The binomial fitting curve of gas concentration voltage relationship is used to fit the relationship between gas concentration and voltage. The accurate detection of gas concentration is realized.
【学位授予单位】：中北大学
【学位级别】：博士
【学位授予年份】：2013
【分类号】：TD76;TD712

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