Active remote sensing involves transmitting a pulse of electromagnetic radiation, and measuring the radiation that bounces off the target (rain drops in this case). Weather radar is an example of an active sensor. Passive remote sensing simply measures incoming radiation, like a camera without the flash.
What is a humidity sensor on windshield?
A humidity sensor detects moisture in the air and regulates fresh air intake. As moisture in the air changes the humidity sensor adjusts the air so, your windshield does not fog up. this is typically a ‘Black Box’ on the passenger side of the rear view mirror (see photo).
How do windshield rain sensors work?
Most rain-sensing wipers use a sensor that’s mounted behind the windshield. It sends out a beam of infrared light that, when water droplets are on the windshield, is reflected back at different angles.
How does a wireless rain sensor work?
The Wireless Rain Sensor is a very sophisticated Sensor Transmitter and Receiver system designed to work with all 24 volt alternating current (VAC) control circuits and 24 VAC pump start relay circuits. The Receiver has three Light Emitting Diodes (LEDs). Each LED can indicate two conditions.