【摘要】：近幾年來(lái),民用天然氣在國(guó)家的大力扶持下,以及自身綠色環(huán)保經(jīng)濟(jì)實(shí)惠的優(yōu)勢(shì),在城市中基本取代了液化氣等傳統(tǒng)能源。天然氣泄漏是燃?xì)馊粘Ｊ褂弥凶畲蟮陌踩[患。目前國(guó)內(nèi)外的家用天然氣報(bào)警檢測(cè)儀普遍采用的是半導(dǎo)體和催化式傳感器,這類傳感器普遍存在穩(wěn)定性差、功耗高、壽命短等問題,給家用燃?xì)獍踩珟?lái)了二次隱患。為保障家用天然氣的安全使用,研制出一套高性能的甲烷報(bào)警器對(duì)于人們的生命安全至關(guān)重要。利用超聲波在不同介質(zhì)氣體中傳輸速度的差異性,提出了一種新型檢測(cè)方法——超聲波相位差氣體濃度測(cè)量法。采用相位差法設(shè)計(jì)的甲烷報(bào)警器分為兩部分:甲烷濃度檢測(cè)模塊以及無(wú)線通信模塊。檢測(cè)模塊設(shè)計(jì)中傳感器采用測(cè)量通道和參考通道的雙通道設(shè)計(jì),將超聲波速度差轉(zhuǎn)化為相位差,用測(cè)得的相位差變化來(lái)反映氣體濃度的變化。同時(shí)采用數(shù)字溫度傳感器進(jìn)行靈敏度補(bǔ)償,拓展了傳感器的工作溫度范圍和檢測(cè)精度。檢測(cè)數(shù)據(jù)通過WiFi無(wú)線通信模塊連接無(wú)線路由并連入互聯(lián)網(wǎng),數(shù)據(jù)保存在云服務(wù)器上,通過電腦或者智能手機(jī)端APP實(shí)時(shí)查看數(shù)據(jù)。報(bào)警器設(shè)計(jì)將超聲波相差法甲烷濃度測(cè)量與WiFi無(wú)線通信緊密結(jié)合,并結(jié)合手機(jī)智能設(shè)備端報(bào)警APP對(duì)報(bào)警信息及時(shí)監(jiān)測(cè)。對(duì)超聲波無(wú)線甲烷報(bào)警器進(jìn)行實(shí)驗(yàn)測(cè)試,結(jié)果表明本報(bào)警器能夠?qū)崟r(shí)、準(zhǔn)確的做出預(yù)警,滿足民用燃?xì)鈭?bào)警器標(biāo)準(zhǔn)要求,具有廣闊的市場(chǎng)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.
【學(xué)位授予單位】：哈爾濱理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TP277

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本文編號(hào)：2399010