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Based on the porphyrin microarray sensor system is a kind of electronic nose it to the image information before and after the reaction of the sensitive array response signal, after the feature extraction, the fingerprint information as the identification of the target substance, and therefore also referred to as the visual electronic nose system . Small size electronic nose system, the ability of data processing, micro total analysis function, has considerable application prospects in industry, agriculture, national defense, medical and other industries, an endless stream of research in this area has developed rapidly in recent years. Existing systems exist to varying degrees narrow range of detection, detection accuracy is not high enough, comprehensive anti-interference ability of the system, lack of data processing capabilities and shortcomings, so the focus of the current study focused on improving system detection accuracy and detection range, as well as recognition accuracy on . In this paper, the core technology of the electronic nose systems, signal acquisition, processing, feature extraction, pattern recognition method, system hardware and software improvements, reasonable collection and extraction of information visualization sensitive material to obtain good recognition effect. Microfluidic image acquisition module as the core embedded systems use high-pixel CMOS image sensor is sensitive unit CMOS device with high resolution, small size, system integration and high significant advantages, in recent years, with its image analysis capabilities continue to improve, directly through the embedded system control, image acquisition, to ensure system accuracy at the same time, minimize the size of the image acquisition system, and enhance the level of integration. In addition, in accordance with the requirements of the system chemical and electronic characteristics of high-brightness white surface mount LED designed small size, high brightness, low temperature light source system, reduces the volume of the system once again in the hardware design, and electronic systems with the interaction of the chemical system to a minimum. In order to improve the accuracy of the system, the use of the image processing system, the image information of the light correction and standardization work, and greatly improving the quality of the image, and to ensure the accuracy of the information. The basis of a large number of experiments, screening out the optimal image feature extraction methods, improving the precision and accuracy of the image recognition. Entire system embedded platform, computer data processing, can be avoided by the embedded system caused by insufficient relative to the PC's processing speed is slow, low capacity data storage and other shortcomings, greatly improving system detection performance; another respect, with the depth of the subject, as well as improved means of a subsequent remote transmission function, the direct contact of the operator and the target gas can be avoided, especially in direct contact with the personnel in the detection of the harmful gases, and inconvenient operation occasions, greatly improve the system's utility properties.
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