Structure Design Of An Embedded Toxic Gas Detecting Instrumentation And Spectral Analysis Research

Due to environmental pollution monitoring, biochemical weapon using in contemporary high technological local war and biochemical attacking possibly motoring by terrorist organization, the higher request is put forward for quickly detecting the virulent gas such as nerve toxic gas sarin, soman and asphyxiating toxic gas phosgene. Developed countries in the world are researching and developing the new method, new technical, the new instrument for the toxic gas measuring, and strive to provide a modern means of detection and safeguard country and the army avoid the threat of biochemical attacks and monitor toxic gas divulging and environmental pollution. This article has understand thoroughly the development process and the domestic and foreign research present situation for the toxic gas detection, and put forward a sort of subminiature, quickly detect, cheap structure of an embedded toxic gas detection instrument based on spectral analysis technology, and has analyzed measuring spectrum.In allusion to the requirement of neuropathic single-component toxic gases identification and trace concentration measure, the instrument structure which was based on Lamb-Beer Law and multi-spot measuring plan was designed, and this article researched the instrument the measure principle, the structural design and the spectral analysis method. The instrumentation used the model after spectrophotometric method structure, and the instrumentation function module included Optical measurement module, Toxic gas current road specimen handling module, Gauge head precision machinery transmission localization module, Embedded hardware control module and Spectrum data analysis processing module. The article elaborated the principle of work and structural design of the instrument, and designed the entire instrument hardware platform based on ARM7 &μC/OS-II embedded system. This article put forward the principal component analysis combined (PCA) with BP Artificial Neural Networks (BPANN)recognition model and the calculative algorithm for trace concentration measure which were based on visible light absorption spectrum analysis, and separately carried on the type recognition test and the instrument demarcation and the trace concentration measure confirmation experiment using the PCA & BPANN combination model and the calculative algorithm for trace concentration measure.The article was divided into six chapters, the toxic gas measuring work instancy, and the development process, and domestic and foreign research present situation were introduced in chapter one. The instrument survey principle and multi-spot survey technology based on the array sensor embarked from the metallic porphyrin characteristic were introduced, and the manufacture flow of toxic gas array strip in the metallic porphyrin array sensor and the overall scheme of the instrument were elaborated in chapter two. The analysis to the instrumentation various essential function module principle of work and the performance requirement were carried on, and the corresponding design proposal were determined in chapter three. The instrument hardware platform based on Samsung Corporation's ARM7 S3C44B0X &μC/OS-II embedded system was designed, and the experimental installation to gain spectrum data was manufactured in chapter four. The toxic gas type recognition subsystem and the trace concentration survey subsystem which are based on the spectral analysis were researched in chapter five. The summary and the forecast to the full text were made in six chapter.