The rain sensor works on the principle of total internal reflection. … An infrared light beams at a 45-degree angle on a clear area of the windshield from the sensor inside the car. When it rains, the wet glass causes the light to scatter and lesser amount of light gets reflected back to the sensor.
Water Level Sensors. Level sensors are used to detect the level of substances that can flow. Such substances include liquids, slurries, granular material and powders. … Such meaurements can be used to determine the amount of materials within a closed container or the flow of water in open channels.
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