【作者】 王振佳；

【导师】 王英；

【作者基本信息】 华中科技大学 ， 光学工程， 2006， 硕士

【摘要】 随着汽车工业的不断发展,科技水平的不断进步,人们对轿车的功能要求也越来越高。特别是希望汽车增加一些自动控制功能,让驾驶变得更加轻松,更加容易。自动感应式雨量传感器就是为了满足人们的这种需要而产生的一种帮助人们自动启动雨刷装置并调节其摆动速度的系统。他们可以让驾驶员在下雨天不必分心去考虑何时启动雨刷,采用何种速度等问题,就能获得清晰的视线并得到适当的雨刷拨水速度。本文分析了自动雨量传感器的作用及工作原理。在查阅了大量国内外相关资料后,设计了整个光学结构的关键部件的设计原理并给出了相关的设计思路。该自动雨量传感器的光学部分的结构共分三个部分:前端是由一个中心波长为906nm的红外LED光源和一个曲率半径为2.94mm的球面透镜构成的发射端;末端是由一个红外LED接收管和一个曲率半径为3.92mm的球面透镜构成的接收端;中间是探测光线经过的挡风玻璃部分。本文利用工程计算软件MATLAB计算了准直透镜和聚焦透镜的曲面方程,并画出模拟曲线。利用光学设计软ZEMAX,根据光线追迹的方法,仿真了光线在自动雨量传感器中准直,全反射和聚焦的整个传播过程。用模拟得到的数据证明了准直透镜和聚焦透镜的确起到了提高自动感应式雨量传感器灵敏度和反映速度的作用,使整个利用全反射原理进行探测的过程得以实现。更多还原

【Abstract】 With the rapid development of automotive industry and technology, more functions were demanded in automobiles for convenience. Some automatic control functions were required especially. Rain sensor was invited to satisfy this kind of needs of people. The Rain Sensor was a highly versatile device for automatic wiping when sensor area of the vehicle windscreen was wet due to moisture, raindrops or even mud. It became more easier for the drivers to get a clear field of vision without distraction.The operation principles and function of the rain sensor were studied. There were three components that make up the optical system of the rain sensor. The first component was a leading end which was made of an emitting LED with a central wavelength at 906nm and a collimating lens with a 3mm radius curvature; the second component was a LED adopter and a focus lens with a 4mm radius curvature; the third component was the windshield in which area the light from the LED pass ed through.The engineering compute software MATLAB was used to calculate the aspheric surfaces of the collimating lens and the focus lens. The optical design software ZEMAX was used to simulate the beam path of the light from LED which went through the whole optical structure of the rain sensor. The result from the simulation proved that the collimating lens and the focus lens were very effective in improving the sensitivity and reaction speed of the rain sensor.更多还原