研究智能氣體檢測(cè)系統(tǒng)外文翻譯-其他專業(yè)(參考版)
2025-01-23 03:01本頁(yè)面
【正文】 the twoarm bridge is prised of measure and pensate ponents pairs. When it is exposed to bustible gases, measure ponents resistance RS increased and transmit output voltage parameter through measuring bridge, the voltage parameter is directly proportional to the gas concentration value. The pensate ponent works as temperature pensation and reference. Main features of MC112 include good repeatability, work stably, reliability, linear output voltage, and quick response. The mine safety rules stated that if methane gas concentration exceeds 1%, safety system should make an alert, if gas concentration exceeds 2%, all people must evacuate immediately. Since the detecting range of MC112 for low concentration methane is 0%2%. Fig. 4. Outside view Signal Amplifier Circuit It is necessary to amplify the weak electrical signal detected by MC112 (1% gas concentration fluctuation will result in 16mv voltage change). The system adopted AD623 developed by AD Company as the high performance instrumentation amplifier. It has many merits: (1) output with 312v single supply (2) easy to modify signal gain though an external resistor, it will be act as a unit gain without external resistor and signal gain can reach to 1000 with an external resistor。 User can customized threshold value by press ADJUST VALUE key and ten number keys, then press ENTER to confirm the change. System starts to detect gas concentration and display these parameters on upper left LED area, at meantime transmit realtime data by RS485 to host puter above ground. 3 Hardware System Design of Gas Detection System The Hardware architecture of system mainly including main control unit, sensors and signal amplifier circuit, A/D converter module, soundlight alarming circuit, keyboard and display module, serialmunication module. Main Control Unit Featured by high integration level, small size and low prices, Single chip microputer has been widely used in a broad range of industrial applications including process controlling, data collection, electromechanical integration, intelligent instrument, household appliances and work technology, and significantly improved the degree of technology and automation. Two factors are taken into account here in chip selecting, first one is antiinterference ability, increase the interferences in SCM application systems, so the SCM must have highresistance to outside interference。 using serial munication port to transmit data to the host puter above ground. The software debugging and hardware simulating of the system above are also implemented at the same time. Keywords: Data collection, Sensor, Serial munication, SCM. detecting system in this paper adopts singlechip microputer as control puter。 參考文獻(xiàn) (略 ) 外文原文 Research of Intelligent Gas Detecting System Abstract. According to statistic data of China in recent years,Gas leakage occurs, Pose a great threat to the personal safety. So the gas detection And monitoring system is required as a safety device applied in the family. In this paper, an intelligent gas detecting system
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