Study On Application Of E-Nose Technique In Electric Fire Monitoring System

This dissertation makes a study on the application of E-nose technique inelectric fire monitoring system. It provides some theoretics for the constructionof a real E-nose based electric fire monitoring system.The gases released by overheated electric wires are monitored by theE-nose based electric fire monitoring system. In this dissertation it reviewspioneer studies on E-nose technique and electric fire, and in order to chooseappropriate gas sensors for the sensor array, it also makes a detailedpresentation on the characteristics of different kinds of electric wires. TheE-nose DAQ system is also constructed. It has several different working modes,such as different sampling rates, different heating modes, etc.As for the experiments, this dissertation makes a study on the sensitivity ofdifferent gas sensors and compares their performances. By means of imitatingdifferent situations, this dissertation tries to find out the final effects on thecharacteristics of sensor responses caused by different heating situations,different detecting positions, different detecting distances and differenttemperature rising rates.Signal pretreating techniques is discussed in detail. These techniquesincludes signal presentation, noise reduction and zero point revision. A doablezero point revision arithemetic is realized in this dissertation. It can not onlyimprove the warning veracity but also bring forward the warning time of theelectric fire monitoring system. This dissertation also presents some commonfire detecting methods and analyses their applicable situations.At the end of this dissertation, it forecasts the application of the E-nosebased electric fire monitoring system and its research directions in the future.