Application And Study Of GPRS Communication Technology In Electronic Nose System

In recent years, with the social development and the increasing consciousness to safety, people need better life and environment, so gas detecting has been a research hotspot. Traditional detecting system can only detect a place at one time and can't obtain the real-time data from the environment that is harmful to man. This paper focused on using mobile communication network (GPRS) as a transmitting channel, we can build a practical, absolute platform which can update easily and form a wireless network by several sensors, the detector can make the decision immediately. The work is the following:1. Introduce the status and the development of electronic nose home and abroad, also analyze the theory of data acquisition and conversion. Based on the fact, confirm the most suitable plan for the system and select SIMENS wireless module MC55 after comparing several kinds of modules, the process is also analyzed.2. A reasonable functional design is worked out with a serious research of functional requirement of the terminal, according to which the analysis and design of each functional modules of remote terminal unit hardware are made; also the implement and debugging of remote terminal unit's circuit board are carried out.3. This paper also includes a careful analysis about the functional characteristics of data acquisition system and a gross structure design of the system .It finished the design of the intimate wireless transmission module which integrates AT89C52,the software design of MCU AT89C52 is providedo Combined functional characteristics and gross structure of this system the software of center is designed with the network programming function of Microsoft Company's Visual C++ programming software .The main features of the thesis are as followed:1. In the research of detecting gas concentration, the voltage of load resistance but not the voltage of sensors is measured, the voltage signal in pace with concentration of the gas sample could be read out , the curves of one sample could be clearly observed after importing the data into Excel.2. The GPRS communication technology applies to the electronic nose system, the curves data will communicate through wireless network and be demodulated by software, the system can be used in some especial fields such as tele-medicine and long distance detection of toxic gas.3. Contrapose to the state that the data acquisition card is too dear in the market, designs the electrocircuit for data acquisition by myself which reduces the cost in the system.