Preh Defogging Sensor (http://rbi.ims.ca/4927-545). Detecting window fogging in vehicles before the occurrence of visible condensation requires humidity and temperature sensors, as well as computer calculations. Mounted on the interior of the vehicle’s windshield, the humidity-sensitive element measures the relative humidity directly on the windshield. Using infrared technology, the sensor detects windshield fogging before it becomes visible to the human eye. A Negative Temperature Coefficient (NTC) thermistor reads the windshield temperature. With the data from the sensor the vehicle’s heating, ventilating and air conditioning system provides an optimal vehicle environment that takes into account humidity, as well as temperature.
This year, Design News is getting a head start on the Fourth of July celebration. In honor of our country and its legacy of engineering innovation -- in all of its forms -- we are taking you on an alphabetical tour through all 50 states to showcase interesting engineering breakthroughs and historically significant events.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.