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Study Of Fluorescence Quenching Based Oxygen Sensors And Odour/liquid Sensors Array Based On Model Identification

Posted on:2003-03-30Degree:DoctorType:Dissertation
Country:ChinaCandidate:J H YangFull Text:PDF
GTID:1118360095450744Subject:Detection Technology and Automation
Abstract/Summary:PDF Full Text Request
This research involves the investigation of some key techniques for novel odour/liquid sensors development. The effort presented in this dissertation consists of four parts. In part I the fluorescence photobleaching characteristics of oxygen sensitive membrane for fluorescence quenching based oxygen sensors are analyzed in details. Using laser source and home made heater control circuit, we study the photobleaching model and investigate the characters of wavelength- dependance, intensity-dependance and temperature-dependance of Ru(dip)32+ based oxygen sensitive membrane. It would provide some benefit suggestions to compensate or rectify the affected sensor output due to photobleaching by software or hardware. In Part II a novel designed electronic tongue is developed, which is a Multiopto-Sensoriccard* based optical ditch system for online liquid detection. Compared with traditional E-tongue, the sensing mechanism of our system is based on spectrum analysis technique. Three actual measuremental results presented in the thesis demonstrate the validity and advantage of this system. Part III is the static and dynamic response characteristic analysis of the electronic nose, which is based on integrated SnO2 gas sensitive sensors array and multi sensors information fuse technology, can be used to identify qualitative and quantitative gas/odor. In actual applications, the factors of concentration of sample, temperature and humidity of circumstance will have strict effects on the response characteristic of the electronic nose. In this section, we study the relations of the system response characteristic changing with the sensors work temperature and sample temperature, humidity and concentration of sample using the home-made experimental system. In the experiments, pure and dry air has been used as carrier air and ethanol in different concentration, wine and water have been used as sample. Experimental investigations show the non-linear specialty, from which the new ideal of 'super-dimension information' detection, is presented. Part IV give out a preliminary discussion to combine electronic nose and electronic tongue to identify four kinds of meat.
Keywords/Search Tags:Optical oxygen sensors, Fluorescence quenching, Membrane, Electronic nose, Electronic tongue, Spectrum Analysis
PDF Full Text Request
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