基于超声波相位差法的无线甲烷报警器设计
发布时间：2019-01-03 06:29
【摘要】：近几年来,民用天然气在国家的大力扶持下,以及自身绿色环保经济实惠的优势,在城市中基本取代了液化气等传统能源。天然气泄漏是燃气日常使用中最大的安全隐患。目前国内外的家用天然气报警检测仪普遍采用的是半导体和催化式传感器,这类传感器普遍存在稳定性差、功耗高、寿命短等问题,给家用燃气安全带来了二次隐患。为保障家用天然气的安全使用,研制出一套高性能的甲烷报警器对于人们的生命安全至关重要。利用超声波在不同介质气体中传输速度的差异性,提出了一种新型检测方法——超声波相位差气体浓度测量法。采用相位差法设计的甲烷报警器分为两部分:甲烷浓度检测模块以及无线通信模块。检测模块设计中传感器采用测量通道和参考通道的双通道设计,将超声波速度差转化为相位差,用测得的相位差变化来反映气体浓度的变化。同时采用数字温度传感器进行灵敏度补偿,拓展了传感器的工作温度范围和检测精度。检测数据通过WiFi无线通信模块连接无线路由并连入互联网,数据保存在云服务器上,通过电脑或者智能手机端APP实时查看数据。报警器设计将超声波相差法甲烷浓度测量与WiFi无线通信紧密结合,并结合手机智能设备端报警APP对报警信息及时监测。对超声波无线甲烷报警器进行实验测试,结果表明本报警器能够实时、准确的做出预警,满足民用燃气报警器标准要求,具有广阔的市场前景。
[Abstract]:In recent years, with the support of the country and the advantages of green environmental protection and economic benefits, civil natural gas has basically replaced traditional energy sources such as liquefied gas in cities. Natural gas leakage is the biggest safety hazard in daily use of gas. At present, semiconductor and catalytic sensors are widely used in domestic natural gas alarm detectors at home and abroad. These kinds of sensors have many problems such as poor stability, high power consumption, short life and so on, which bring secondary hidden trouble to the safety of domestic gas. In order to ensure the safe use of domestic natural gas, it is very important to develop a set of high performance methane alarm device for the safety of human life. Based on the difference of ultrasonic velocity in different medium gas, a new detection method-ultrasonic phase difference gas concentration measurement method is proposed. The methane alarm designed by phase difference method is divided into two parts: methane concentration detection module and wireless communication module. In the design of the detection module, the sensor adopts the two-channel design of the measuring channel and the reference channel. The ultrasonic velocity difference is transformed into the phase difference, and the change of the measured phase difference is used to reflect the change of the gas concentration. At the same time, the digital temperature sensor is used to compensate the sensitivity, which extends the working temperature range and the detection precision of the sensor. The detection data is connected to the Internet via the WiFi wireless communication module. The data is stored on the cloud server, and the data is viewed in real time through the APP of the computer or smart phone. The alarm design combines the measurement of methane concentration by ultrasonic phase difference method with WiFi wireless communication, and the alarm information is monitored in time with the alarm APP at the end of mobile phone smart device. The experimental test of ultrasonic wireless methane alarm shows that the alarm can make early warning in real time and accurately, meet the requirements of civil gas alarm, and have a broad market prospect.
【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】：2017
【分类号】：TP277
本文编号：2399010
[Abstract]:In recent years, with the support of the country and the advantages of green environmental protection and economic benefits, civil natural gas has basically replaced traditional energy sources such as liquefied gas in cities. Natural gas leakage is the biggest safety hazard in daily use of gas. At present, semiconductor and catalytic sensors are widely used in domestic natural gas alarm detectors at home and abroad. These kinds of sensors have many problems such as poor stability, high power consumption, short life and so on, which bring secondary hidden trouble to the safety of domestic gas. In order to ensure the safe use of domestic natural gas, it is very important to develop a set of high performance methane alarm device for the safety of human life. Based on the difference of ultrasonic velocity in different medium gas, a new detection method-ultrasonic phase difference gas concentration measurement method is proposed. The methane alarm designed by phase difference method is divided into two parts: methane concentration detection module and wireless communication module. In the design of the detection module, the sensor adopts the two-channel design of the measuring channel and the reference channel. The ultrasonic velocity difference is transformed into the phase difference, and the change of the measured phase difference is used to reflect the change of the gas concentration. At the same time, the digital temperature sensor is used to compensate the sensitivity, which extends the working temperature range and the detection precision of the sensor. The detection data is connected to the Internet via the WiFi wireless communication module. The data is stored on the cloud server, and the data is viewed in real time through the APP of the computer or smart phone. The alarm design combines the measurement of methane concentration by ultrasonic phase difference method with WiFi wireless communication, and the alarm information is monitored in time with the alarm APP at the end of mobile phone smart device. The experimental test of ultrasonic wireless methane alarm shows that the alarm can make early warning in real time and accurately, meet the requirements of civil gas alarm, and have a broad market prospect.
【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】：2017
【分类号】：TP277
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