复合恶臭嗅辨电子鼻关键技术研究

发布时间：2018-07-11 10:35

本文选题：复合恶臭监测 + 电子鼻　；参考：《河北工业大学》2015年硕士论文

【摘要】：随着工业的发展,私家车数量的不断上涨,出现了很多环境问题。工厂废气、建筑扬尘、汽车尾气等时刻污染着我们赖以生存的空气。随着人们环保意识的增强,环境问题受到了人们越来越多的关注,在大气污染源中,除了PM2.5以外,恶臭对人们生活的影响日益严重,因此恶臭也成了重点监测的对象。但是国内对恶臭的监测还很不完善还没有成熟恶臭监测系统,而国外的仪器价格相对昂贵,因此开发高性价比的专用复合恶臭监测系统迫在眉睫。通过对国内外现有的恶臭测量方法的研究,结合目前的电子鼻技术,本文对复合恶臭嗅辨电子鼻系统的关键技术进行了研究与改进。本文改进的关键技术主要包括以下几个方面:气路中汇流排的设计,传感器调理电路的设计,上位机定标系统的设计,信号处理及恶臭值计算新模型研究。改进后的复合恶臭嗅辨电子鼻主要由传感器阵列、传感器信号调理电路、基于c8051f020的采样系统及上位机系统组成。到目前为止,恶臭检测最主要的方法有三点比较式臭袋法、仪器测定法等。三点比较式臭袋法检测速度慢、耗费人力且检测结果易受人为因素的影响;仪器测定法价格昂贵且只能检测单一物质。相比以上两种方法,本文研究的复合恶臭检测系统具有响应快、稳定性高、高精度、适用范围广等特点。实验表明,本系统对NH_3、H_2S、挥发性有机物VOCs(volatile organic compounds)等恶臭气体有明显响应,测量范围为17ppb到100ppm,其稳定性、灵敏度、精度都可满足现实需求,因此该电子鼻检测系统具有广阔的应用前景。
[Abstract]:With the development of industry, the number of private cars has been rising, there are many environmental problems. Factory exhaust, building dust, automobile exhaust and so on are polluting the air we depend on. With the enhancement of people's awareness of environmental protection, people pay more and more attention to environmental problems. Besides PM2.5, the influence of odor on people's lives is becoming more and more serious, so stench is also the focus of monitoring. However, the domestic monitoring of odor is not perfect, and there is no mature odor monitoring system, and the price of foreign instruments is relatively expensive, so it is urgent to develop a special compound odor monitoring system with high performance and price ratio. In this paper, the key technology of the electronic nose recognition system of compound odor smell is studied and improved through the research on the existing methods of odor measurement at home and abroad, and combined with the current electronic nose technology. The key technologies of this paper include the following aspects: the design of the busbar in the gas path, the design of the sensor conditioning circuit, the design of the calibration system of the upper computer, the research of the signal processing and the new model of calculating the odor value. The improved electronic nose is mainly composed of sensor array, sensor signal conditioning circuit, sampling system based on c8051f020 and upper computer system. Up to now, the main methods of odor detection are three-point comparative stink bag method, instrument method and so on. The three-point comparison stinking bag method has the advantages of low detection speed, labor consuming and easy to be affected by human factors, and the instrument method is expensive and can only detect a single substance. Compared with the above two methods, the complex odor detection system studied in this paper has the characteristics of fast response, high stability, high accuracy and wide application range. The experiments show that the system has obvious response to odor gases such as NH _ 3H _ 2S, VOCs (volatile organic compounds) and so on. The range of measurement is from 17ppb to 100 ppm.The stability, sensitivity and accuracy of the system can meet the practical needs. Therefore, the electronic nose detection system has a broad application prospect.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X851

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