The light is completely reflected if the sensitive area of the windshield is dry. The IR receiver located at the other end of the lens measures the intensity of the light reflected from the windshield. The infrared (IR) transmitter unit radiates IR light, which is directed to the windshield through the lens. A reliable and sensitive system is achieved when the ratio between the windshield area and the sensitive area is considerable Functional Principle The detection of rain by the sensor depends on the contact of water drops with the sensitive area. The area where the light is reflected from the windshield to LRD is known as the ‘sensitive area’ of the sensor. As a result, LRD generates a lesser amount of current, which is estimated by the electronics. Some amount of light is coupled out if the windshield contains water. The outer surface of the windshield reflects the light produced from the LED at an angle of total reflection in the range of 42° to 63°. The optical system of the rain sensor comprises an electronic control unit (ECU), ambient light sensor, lenses, a light-receiving diode (LRD) and a light-emitting diode (LED). Rain sensors are also widely used in the agriculture and gardening sectors by providing multiple benefits not only to the users but also to the environment. These sensors automatically switch on the wiper in case of a water splash on the windshield. Rain sensors enhance safety and comfort while driving.
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