可燃性氣體檢測(cè)與報(bào)警系統(tǒng)的外文翻譯

1、 本科畢業(yè)論文 本科畢業(yè)論文(設(shè)計(jì) 設(shè)計(jì))外 文 文 獻(xiàn) 翻 譯譯文題目： 譯文題目： Design of detection of combustible gas and alarm system 學(xué)生姓名： 學(xué)生姓名： 專 業(yè)： 業(yè)： 數(shù)學(xué)與應(yīng)用數(shù)學(xué)和電氣工程及其自動(dòng)化 指導(dǎo)教師： 指導(dǎo)教

2、師： 2013 年 2 月第 2 頁(yè)The slave part mainly complete data collection and wireless transmission. The master part mainly complete receiving data, displaying and sending alarm message.The signa

3、l of gas concentration is collected by combustible gas sensor which generates a weak electrical signal. The signal can be amplified and stabilized by conditioning circuit. And then A/D circuit converts the analog signa

4、l to digital signal which microcontroller can process. In order to improve the measurement accuracy, and reduce the impact of temperature, design a temperature compensation circuit to collect tempreture data. AT89S52 p

5、rocess the collected data and send data to the master by wireless transceiver.The master receives the data and displays it by LED. And if the gas concentration being abnormal,the system will drive speaker for an alarm

6、signal and use TC35i module to send alarm information to user’s mobile. Hardware design Signal Signal acquisition acquisition and and conditioning conditioning circuit. circuit. Figure 2 shows data acquisition circuit.

7、TGS813 is a Gas sensing resistive sensor. The conductivity of TGS813 is influenced by the concentration of combustible gases in air, the greater the concentration, the higher conductivity. In system R0, R9, R10 and RS

8、(in TGS813) form a bridge circuit to convert resistance to voltage signal. Operational amplifier A connected as a voltage follower with resistors R7 and regulator D1 make up the voltage regulator circuit to supply powe

9、r for the bridge. In order to the voltage adapt to the A/D converter, the voltage is amplified by opamp B, and the magnification can be adjusted through resistor R11. Fig. 2 Gas concentration signal acquisition circuit