外文翻译- 气体传感器精品.doc

英 文 翻 译 系 别 专 业 班 级 学生姓名 学 号 指导教师  Gas sensor Gas sensor is a gas volume fraction will be a corresponding electrical signal into the converter. The first sensor to detect the gas through the gas sample conditioning, usually including interference filter out impurities and gases, drying or cooling to deal with instrument display Gas sensor is a component of the gas concentration and other information can be converted into personnel, instrumentation, computers and other devices that use the information! Gas sensors are generally classified as a class of chemical sensors, although this classification does not necessarily science. Gas sensor, including: semiconductor gas sensors, electrochemical gas sensors, catalytic combustion gas sensor, thermal conductivity gas sensors, infrared gas sensors. The application of gas sensors mainly include: carbon monoxide gas detection, gas detection, gas detection, freon11, R12 greasewood alcohol detection in the detection, exhale, human oral bad breath test and so on.Its species and information related to the concentration of the gas is converted into electrical signals according to the strength of these electrical signals can gain associated with the presence of gas under test in the environment of information which can detect, monitor, alarm, can also through the interface circuit and the computer automatic detection, control and alarm system.Different in nature, because there are so many types of gas can not use a sensor to detect all kinds of gas so can realize gas electricity transformation has a variety of sensors according to form gas sensor materials can be divided into two categories, semiconductor and semiconductor.Actually use at present most is the semiconductor gas sensor, therefore this article mainly tells about the principle and application of semiconductor gas sensitive element. Semiconductor gas sensor is used for measuring gas in contact with the surface of the semiconductor, changes