| Nowadays,industrial intelligence is developing rapidly.However,the increasing energy consumption has led to serious problems of global climate change and environmental pollution.To provide sustainable development and smart city solutions,transformation and optimization of energy,industry and manufacturing are needed.In these areas,accurate sensing and quantification of key parameters are essential for monitoring,controlling and optimizing production.In energy,industry,manufacturing and even daily life,the emergence of all kinds of hazardous chemical gases to the environment and people gradually emerged,so that people need to pay more attention to air pollution detection,industrial emission source detection,hazardous chemical transportation monitoring,leakage monitoring and many other issues.Therefore,it is very important and necessary to carry out online detection of related gases.In recent years,significant progress has been made in the development and deployment of gas monitoring sensing solutions based on laser absorption spectroscopy（LAS）,which have advantages of simple structure,fast response speed,and high accuracy.With the development of science and technology,tunable semiconductor laser absorption spectra（TDLAS）have become an important tool for measuring trace gas concentration.The technique uses the absorption properties of the molecules to the laser to invert the concentration of the measured gas in real time.This technology has fast response time,high sensitivity and no sampling.The purpose of this thesis is to develop a multi-component gas laser remote sensor to achieve high-precision and efficient non-contact real-time telemetry for a variety of hazardous gas leakage in the field of energy,industrial production and transportation.The specific contents of this thesis include:（1）Clarify the background and significance of this research from the perspectives of global environmental governance,energy security and industrial safety,and analyze the importance of gas detection technology.Several commonly used gas detection methods and their advantages and disadvantages are briefly described.The current research progress of TDLAS technology at home and abroad is summarized.（2）Starting from the basic theoretical knowledge of spectroscopy.The infrared absorption spectrum theory,including the basic principles of gas molecular absorption,Lambert-Beer law and line broadening mechanism,is introduced in detail.Two methods for gas detection using TDLAS are summarized:Direct Absorption Spectroscopy and Wavelength Modulation Spectroscopy.（3）The design architecture of the remote sensing is introduced,and the optimal gas absorption spectrum is selected.From two aspects of optical system and hardware system,the selection of optical unit and electronic device,the important parameter characteristics and the realization of core hardware are introduced respectively.The whole working principle of the system and how to solve the problem of multi-system detection interference are described in detail.（4）Through experimental measurement and analysis,the results show that the concentration limits of CH4,NH3 and C2H2 detected by the system can reach 87 ppm·m,212 ppm·m and 12 ppm·m,respectively,with a measurement error of less than 10%.The telemetry distance of the sensor can reach 40 meters.（5）Summarize the research and application of multi-component gas remote sensing.Some new ideas are put forward for the later improvement and research. |
