传感器(sensor)英文PPT演讲课件.ppt

Living in a rapidly developing society，we have the chance to enjoy many things people who has died can not. 翻译 定义： 能感受规定的被测量并按照一定的规律转换成可 用输出信号的器件或装置。 作用：探测、感受外界的信号、物理条件（如光、热、 湿度）或化学组成（如烟雾），并将探知的信息传递给 其他装置或器官。 Light sensor 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 wavelengthand ultraviolet wavelengths. 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. H?a?l?l? ?e?f?f?e?c?t? ?s?e?n?s?o?r? H?a?l?l? ?e?f?f?e?c?t? ?s?e?n?s?o?r? Acoustic sensors(声敏传感器) Working principle The sensor is sensitive to a built-in to sound capacitive [k?p?s?t?v] electret microphone（电容式驻极话筒）. Sound waves make the microphone electret film（驻极体膜） vibration [va?bre??(?)n], result in the change of capacitance [k?p?s?t(?)ns], and produce with the corresponding change of tiny voltage [v??lt?d?; v?lt?d?]. Then this voltage is converted into 0 to 5 voltage, and transmitted to the computer, after A/D conversion was accepted by the data collector. Aplication A. the sensor does not need to check it again, the software zero（调零）automatically. B. sampling frequency must reach10000 times per second or more, otherwise，it’s not true and accurate to reflect the image of acoustic vibration. C. y coordinate of the image represents the voltage value corresponding to acoustic vibration . D. when cost limited , manufacturers can use positive and negative si