The Method Research On Orientation Detection Of Gas Signal Source

In the course of the high development of the society and economy in china with the demand of constructing the harmonious society by people, the public security in the social living and the serious energy lack in the expanding industry and economy are becoming the bottlenecks to that progressing course increasingly. For solving these, the new technologies are urgently investigated to enhance the monitoring and forewarning ability of the public security, and develop the new clean bioenergy instead of the increasingly reduced and non-reproducible fossil energy. In all these processes of observing, apperceiving, detecting and monitoring the application system in the area of the social living and industrial production for the new technologies, the methods and technologies of the gas information acquisition and the gas signal processing are playing the crucial roles. However, in the past, the researches are focused on the information acquisition of root property to the detected gas, e.g. the gas temperature and the gas concentration. With the demand of the technology development increased, it is satisfied by people not only to acquire the root property of the gas information, but also to acquire the space property of the gas information for feedback controlling the application system via mining the obtained information, e.g. the space information of the gas source orientation. Therefore, the detection methods of the gas space information in the various application backgrounds of engineering are becoming an important research direction of the gas detection and the intelligent signal processing currently.qThe application research on the detection technology of the gas signal source orientation, the research requirements and issues, viz. the researches of the theoretic methods to the detection of the gas signal source orientation in the narrow space and the plane space, are presented firstly by discussing the applications of the gas signal detection in the areas of the public security and the bioenergy. And the application purposes of the detection for the gas signal source orientation are illustrated secondly. For example, in the area of the public security, it is indicated that the fast fire source localization by using the detection technology of the gas signal source orientation is available to realize the optimizing control of people evacuation in fire, via. the application research of the fire detection in nonage, i.e. the fast fire source localization can sharply decrease the alarm time of the fire detection, viz. correspondingly prolong the time of people evacuating, to ensure the safety of people evacuation. And in the area of the bioenergy, it is indicated that the fast biogas source localization by using the detection technology of the gas signal source orientation is available to realize the optimizing control of the production system of the biogas collection for the large and continuous producing via. the application research of the biogas detection, collecting and generating electricity.The detection of the gas signal source orientation is a basic detecting task of the gas space information. Combining with the basic principles and specialities of the gas diffusion, the key technologies adapted with the demand of practical applications, involving of the methods, theories, algorithms, are lucubrated and discussed in the thesis. And the main researches of the thesis are presented in the followings.In the first part, i.e. the application research on the gas diffusion theories and models, the characters and specialities of the gas diffusion in the certain space are acquired via. analyzing the gas diffusion models and applications based on the practical engineering, involving the fluid, the turbulence, the turbulent diffusion, the turbulence diffusion with a continuous point-source, plume flow and jet flow. There are two characters researched in the part, the one is that the gas concertration is decreased with time moving when the gas diffusing in a certain direction in the narrow space, and the other is that the gas concertration grads is distributed around with a certain centre point and diffused to the all directions by the type of circle simulating as a planar wave in the plane space. And these studies provide the theoretic supports for establishing the detection methods of the gas signal source orientation in the following and the new investigation direction.In the second part, i.e. the research on the detection of the gas signal source orientation in the narrow space, the thesis presents the method of the detection of gas signal source orientation in the narrow space, via. applying the detection sensor array in the gas signal sampling, using a mathematic tool based on the rough set theory for the computation. And then an algorithm based on the rough measure for the detection method is given, in which for the goal of estimating the gas signal source orientation, the polarization characteristics of sampling signal space of gas concertration is obtained via. computing the rough measure. Lastly the applicability and robustness of the method are discussed via. the algorithm simulations.In the third part, i.e. the research on the detection of the gas signal source orientation in the plane space, the thesis studies the gas plane diffusion characters and gas concentration distribution, and presents the method of the detection of gas signal source orientation in the plane space, which is based on dual-line gas sensor array and not to change the current technology of gas sensor. And then an algorithm based on the time delay estimation of the signals from the dual-line array for the detection method is given, and the applicability and robustness of the method are discussed via. the algorithm simulations.The achievements of the research work in this thesis can be used to detect the gas signal source orientation for the localization and discovery of the gas source, where the detection method of the gas signal source orientation in the narrow space is applied in the scenes of lower requirement for the orientation detection, and the detection method of the gas signal source orientation in the plane space is applied in the scenes of higher requirement for the orientation detection.