Electromagnetic Sensors
The term “electromagnetic” refers to any form of energy that is propagated as a wave. Starting with the lowest energy and going to the highest, some examples are radio waves, infrared light, visible light from the red to the violet, ultraviolet light, and x-rays. Sound is essentially a propagating pressure wave, and therefore slightly different from electromagnetic radiation, but it is sensed in a very similar fashion.
The simplest electromagnetic sensors respond to a physical condition, like photoelectric cells that are used to turn lights on when the sun goes down. These work by measuring the intensity of light coming from the sun; for example, when a bright light drops below a certain predetermined brightness level, ...
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