传感器英文演讲PPT完美.ppt

2013 12 25 李龙威 Living in a rapidly developing society，we have the chance to enjoy many things people who has died can not. Some one may like smart cars Some one may be pure Military enthusiasts But every machine can not work without many special devices in it. These special devices are called “transducer” or“sensor”,which are widely used in everywhere. Sensors to machine is what sense organs to a people .Lots sensors make up the nervous system of the machine ,then the machine can be controlled by people to do what they want . Now ,let’s have a realization on the different senses of machine. Photosensitive sensor Acoustic sensors Gas sensor chemical sensor Pressure ,temperature ,fluid sensor Photosensitive sensor(光敏传感器) Photosensitive sensor is one of the most common sensor, its sort is various, mainly include: photocell(光电管), photomultiplier tubes（光电倍增管）, photosensitive resistance（光敏电阻）, light activated triode（光敏三极管）, solar cells （太阳能电池）and infrared sensors（红外线传感器）, ultraviolet [?ltr?‘va??l?t] sensors（紫外线传感器）, optical [’?pt?k(?)l] fiber type photoelectric sensor（光纤式光电传感器）, color sensor, CCD and CMOS image sensor, etc. Light sensor is the most current production, one of the most widely used sensors, it plays an important role in automatic control(自动控制) and non-electricity measurement [‘me??m(?)nt] technology（非电量电测技术）. The simplest photosensitive sensor is photosensitive resistance(光敏电阻), it will create electric current when photons（光子） hit joint（结合处）. Working principle Light sensors can converts light signals into electrical signals with photosensitive element sensor , its sensitive wavelengths is close to the visible light wavelength, including infrared [?nfr?red] wavelength（红外线波长） and ultraviolet [?ltr?va??l?t] wavelengths（紫外线波长）. Light sensor is not limited to light detection, it also can be used as a detection device of other sensors to test many non-electrical, as long as the non-electric can be converted into optical signal changes（光信号变化）. App