A mail thread from my mail box, i was answering a question by an engineer about proximity switches. Question was – how bently nevada proximity sensor works
Mail from UM
Microwave and RF radiates energy. – You know when a magnet is moved near small nails it make them Move ! If you make an DC electromagnet, it make the nails move again.
But when you keep swapping the polarities, That is with an AC supply it generates a field or radiates an energy. Right from the Toy generator with magnets to the Sun it is the same. The highest form of sun is it radiates photons.
RF is nothing but a Magnet rotated at high speed which is called frequency. This energy can cause food to cook in your microwave oven or a proximity sensor to gauge the gap. It even helps people when the have a sun bath.
I have seen even an old Analog Joystick of a Machine has this induction method to position objects. Study Links below for helping you understand better.
Applications of electromagnetic induction – An eddy current is a swirling current set up in a conductor in response to a … and to provide the necessary energy required for the motor to do work.
Design of an Eddy-Current Proximity Sensor using a Two-Coil Planar … .However these proximity sensors are not conducive to scaling to conventional integrated circuit levels. This is because most conventional eddy current