A Transparent Optical Sensor for Moisture Detection Integrated in a PQ-PMMA Medium
A Transparent Optical Sensor for Moisture Detection Integrated in a PQ-PMMA Medium
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DOI：
10.1109/lpt.2013.2257715
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发表时间：
2013-05-15
影响因子：
2.6
通讯作者：
Kowarschik, Richard
中科院分区：
文献类型：
--
作者：
Matusevich, Vladislav;Wolf, Frank;Kowarschik, Richard
提出了一种用于检测车辆挡风玻璃表面上的水的透明光学传感器，即所谓的雨水传感器（RS）。RS基于光源、耦合全息衍射元件（HDE）、波导（WG）和检测器。新型RS的优点是其透明度，这使得它可以位于驾驶员的视野范围内。将光信号耦合进和耦合出WG的HDE被制造为集成到挡风玻璃中的有机玻璃聚甲基丙烯酸甲酯-菲醌光聚合物复合材料的层压材料。在检测区域中，光信号在全内反射角下从WG耦合到挡风玻璃表面上[对于玻璃和空气边界为42度（对于从玻璃到空气的过渡），对于玻璃和水为62度]。根据挡风玻璃表面上沉积的水分，光信号将被反射回WG，并将传播到检测器或将耦合出玻璃。
A transparent optical sensor for detecting water on a windscreen surface of vehicles, a so-called rain sensor (RS), is presented. The RS is based on a light source, coupling holographic diffraction elements (HDEs), a waveguide (WG), and a detector. The advantage of the novel RS is its transparency, which allows it to be located in the driver's view area. The HDEs that couple the light signal into and out of the WG are manufactured as a laminate of a Plexiglas polymethylmethacrylate-Phenanthrenequinone photopolymer composite integrated into a windscreen. In the detecting area the light signal is coupled out of the WG onto the windscreen surface under total internal reflection angles [between 42 degrees for glass and air border (for the transition from glass to air), and 62 degrees for glass and water]. Depending on the moisture deposited on the windscreen surface, the light signal will be reflected back into the WG and will either propagate to the detector or will be coupled out of the glass.