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1、外文文献资料收集：苏州大学应用技术学院10电子班级（学号1016405035）陶悦Gas detection and gas sensor1. Gas detectionGas detection system is safe and necessary equipment fields of industrial and mining enterprises, the social public utilities, environmental protection etc. After decades of development, improve the main technique i
2、ndex can be measured gas species, measurement range, precision, stability, life and otheraspects, with the development of large scale integrated circuit technology, the instrument combination to miniaturization, multi parameter and intelligent direction. New methane gas detection system should have
3、the characteristicsof intelligent, can interfere in certain other gases can work, can be by electronic nose. The structure of the system, through the pattern recogn i t i onme t hod for identification of met bane gas. Methane gas to the miniaturization of electronic systems based detection system, s
4、hould be considered in designand sampling device reduces the volume of the system, a simplified gas and improve the circuit to meet the low power requirement; in addition the portabledetection system operator is normally site personnel, belonging to the non professional personnel, the operation of t
5、he system cannot the complex, so for the interactive function of the system should also be paid attention to in the design. The existence of the traditional gas selectivity is not high, poor anti-interference problem based on metal oxide gas sensor, detection system withsingle sensor in detecting if
6、 there is interference of other gases, is easy to appear the similar response and misjudgment. This paper discussed the high sensitivity methane detection system based on single chip microcomputer is ametai oxide micro gas sensor array as the sensitive element, a portable systemfor methane detection
7、 combined with pattern recognition technique. The signal processing circuit of the whole system is composed of four element sensorarray device, gas sampling device and high-speed MCU as the corecomponent, has the advantages of small size, high accuracy, strong anti-interference ability and excellent
8、 performance. This paper introduces working principle and design of the detection system, we focus on the design of low power circuit.Coal mine production safety monitoring system is in production and applicationat home and abroad, but it is not a really suitable for small and medium-sized coal mine
9、 product, China began to introduce the production of coal mine safety monitoring system from the early eighty s, after the process ofintroduction, digestion and absorption, direct imitation of matching, independent development, but so far most of the products are the face oflarge-scale mine design,
10、but its still has some problems to be solved, such as:high cost, the systems basic configuration is too large, high operating cost, sensor measurement stability, adjust the frequent, short service life, system installation, maintenance complex, inconvenient operation, the man-machinerely on theinter
11、face is poor, poor reliability of system equipment. We must professional maintenance team, the technical staff, have a higher qualityrequirements. The monitoring system technology theory is higher than thedomes tic level of development, but the application limitation in domes tic coal mine is still
12、a certain amount of, such as the mode of management of coal mine production in different ways, the h i gh price is not suita ble for the existingconditions of domestic coal mine, in addition to the sensor technology for reference, the other only has a certain reference value. To sum up, the developm
13、ent is suitable for the production of small coal mine safety monitoring system of the imminent task, according to Chirms coal mine production andmanagement mode, in accordance with the relevant technical standards of our country, reliability and practicability, the advanced product technology is the
14、key of the project location.The basic structure of the gas detection system consists of a fine catheter, micro pump and the air chamber inlet part, single-chip microcomputer as the core control, signal acquisition and processing circuit and the display, keyboard, PC interface circuit, and PC running
15、 in the application software forartificial neural network training, the detecting system of the gas detection worksteps is, single-chip microcomputer to control the gas pump to be detected is pumped into the chamber, collecting the response signal of gas sensor arrayand at the same time, conversion,
16、 storage in the data memory, then SCM fromthe saved data extracted eigenvalue, identified by the network for gas identification, and the results output to the LCD display screen. According to the characteristics of the portable system, det ection system design of the processing circuit has small volume, low power consumption.2. Gas sensor classification2. 1 Semiconductor gas sensorIt is the use of metal oxide semiconduc tor material, at a certain temperature, the manu
