Sensors are designed to respond to a particular change in condition. Pressure, temperature, barometric, rainfall and so on. Usually they take the form of a transducer to convert the signal into an...
Simply put, an oxygen sensor reacts to oxygen thus creating a voltage as high as 0.9v. The higher the voltage the richer the engine is running. Abnormally high voltage is caused by unburnt oxygen in...
There are a few different ones out there, but most of them work by the Doppler principle and on sound at ultrasonic frequencies.
Doppler effect is the appearent shift in the frequency of a signal...