An EM sensor is an electromagnetic sensor (Hard Tag) used for inventory control in retail stores. They are the tags you find attached to expensive stuff that only come off at the register when you check out. They come in a variety of shapes and sizes.
Here is a link to wikipedia explaining everything you ever wanted to know on the subject.
http://en.wikipedia.org/wiki/Electronic_article_surveillance
1.transmission and reception 2.impedence matching 3.sensor to em waves 4.suppressing
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The transmitter sends out EM waves. EM waves are a carrier of energy and are produced by oscillating charges - usually caused by connecting metal to AC power supply. The waves travel through a medium and transfers its energy to the antenna which is basically a metal rod. The energy causes charges in the metal to oscillate at a certain frequency, controlled at the transmitting end. The charges oscillate to produce corresponding EM waves which can be detected/read as signals and turned into sound energy etc...
Smoke 'Em If You Got 'Em - album - was created in 1990.
Rock 'Em Sock 'Em Robots was created in 1967.
EM & EM= EM & EM WORLD Pink= pinkville JB= No one cares
If You Can't Lick 'Em...Lick 'Em was created in 1988-02.
wear 'em, collect 'em, trade 'em
If You Can't Join 'Em... Beat 'Em was created on 2005-04-11.