November 2002
Beginner
208 pages
4h 36m
English
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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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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.