摘要
雨量传感器的光学部分是采用红外波段全反射光学系统。传感器的6个红外线发光二极管以红外探测器为中心对称分布在同一圆周之上。红外发光二极管被分成两组各带3个发光二极管的传播分支。脉冲红外光线的入射角设计为无雨水时的全反射临界角,每个传播分支对探测器进行交替辐射,比较2个传播分支红外辐射的光通量。汽车风挡玻璃上的雨水,改变了脉冲红外光线出射光介质的折射率,全反射条件被破坏,2个传播分支红外辐射的光通量的对称平衡亦发生变化,检测电路将产生冲信号。径向对称光路上的雨水量与脉冲信号的幅值呈线性关系。红外发光二极管与红外探测器的工作时序由单片计算机控制,同时将数据通过lin总线与汽车车身ECU连接。
A infrared optical part of the reflective optical system was used in rain sensor on the mobile.The six infrared light-emitting diode of sensor was distributed symmetrically around centered infrared detectors on the same circle.Infrared light-emitting diodes were divided into two groups with the spread of the three branches of light-emitting diode.Pulsed infrared light incident angle was designed to no rain during the critical angle of total reflection,each branch of the detector alternately transmitted radiation,compare the two transmission branches of the flux of infrared radiation.The water on automotive windshield glass changes the refractive index of pulse infrared light ray,and total internal reflection condition is destroyed.The two transmission branches of the flux of infrared radiation also changes the symmetry balance of the detection circuit will produce a pulse signal.Radial symmetry in the light path and water volume pulse amplitude was linear.Infrared light-emitting diodes and infrared detectors work by a single computer-controlled timing,while the data bus and car body through the Lin ECU connection.
出处
《仪表技术与传感器》
CSCD
北大核心
2010年第9期96-98,共3页
Instrument Technique and Sensor
