基于双敏感模式的全量程甲烷检测仪设计

发布时间：2018-06-23 08:51

本文选题：全量程 + 甲烷　；参考：《哈尔滨理工大学》2015年硕士论文

【摘要】：矿井瓦斯监测一直是我国煤矿安全工作的重点。催化燃烧式气体传感器具有灵敏度高、响应速度快、成本低廉等优点。但在检测高浓度甲烷时,催化反应产生的热量过大会导致传感器发生高浓度冲击问题,同时存在二值性问题。并且不合理设计使催化敏感元件在高浓度甲烷气体中燃烧,导致敏感元件损坏,甚至引起瓦斯爆炸。因此,矿用全量程甲烷检测技术研究对提高矿井瓦斯监测产品的稳定性以及安全生产具有重要意义。本设计对催化燃烧式气体传感器进行了理论分析和测量方法研究,对敏感元件的催化燃烧特性和热传导特性进行了热效应理论分析,研究并确定数据处理数学模型,提出了基于双敏感模式的全量程甲烷检测方法。本文根据甲烷检测仪的功能要求与设计的参数指标,对全量程甲烷检测仪的检测算法方法进行了详细的分析,并进行零点漂移和灵敏度衰减补偿,最终得到低浓度和高浓度甲烷气体的具体解决方案。配合使用的恒温供电方式使传感器更加稳定、可靠的工作。该检测仪在硬件电路设计有单片机最小系统电路、电源管理电路、信号放大电路、参比源电路、红外接收电路、以及数据输出显示电路。基于这些电路设计进行电路调试。检测仪的系统软件设计包括:主程序、浓度数据采集处理程序、遥控器解码程序、标定程序、按键服务程序等。本文对基于双敏感模式的甲烷检测仪进行了实验室实验调试,对传感器受环境温度的影响做了初步测试,进行了甲烷温度、灵敏度补偿前后对比测试。结果表明:检测仪检测精度高,抗干扰能力显著增强,设备使用易于检修维护,实现了采用单一催化燃烧式传感器进行全量程甲烷检测。
[Abstract]:Mine gas monitoring has been the focus of coal mine safety work in China. Catalytic combustion gas sensor has the advantages of high sensitivity, fast response and low cost. However, the excessive heat generated by the catalytic reaction leads to the high concentration impact of the sensor and the binarity problem in the detection of high concentration methane. And the improper design causes the catalytic sensitive element to burn in the high concentration methane gas, resulting in the damage of the sensing element and even the gas explosion. Therefore, it is of great significance to improve the stability and safety of mine gas monitoring products. In this paper, the theoretical analysis and measurement method of catalytic combustion gas sensor are carried out, and the thermal effects of catalytic combustion and heat conduction of the sensor are analyzed theoretically, and the mathematical model of data processing is studied and determined. A full range methane detection method based on double sensitive mode is proposed. In this paper, according to the function requirement of methane detector and the parameter index of design, the detection algorithm method of full range methane detector is analyzed in detail, and the zero drift and sensitivity attenuation compensation are carried out. Finally, the specific solution of low concentration and high concentration methane gas is obtained. The combined use of constant temperature power supply makes the sensor more stable and reliable. The hardware circuit of the instrument is designed as follows: single chip microcomputer minimum system circuit, power management circuit, signal amplifier circuit, reference source circuit, infrared receiving circuit, and data output display circuit. The circuit is debugged based on these circuit designs. The system software design includes: main program, concentration data acquisition and processing program, remote control decoding program, calibration program, key service program and so on. In this paper, the methane detector based on double sensitive mode has been tested in laboratory, and the sensor has been preliminarily tested under the influence of ambient temperature, and the methane temperature has been compared before and after sensitivity compensation. The results show that the detection accuracy of the detector is high, the anti-interference ability is obviously enhanced, and the equipment is easy to be repaired and maintained. A single catalytic combustion sensor is used to detect methane in full range.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD712.55;TP212.9

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