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how does the library bookk detector work in the library?

28-02-2005 11:00am

#1

synchro

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how does the library bookk detector work in the library?

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#2 28-02-2005 11:39pm

Capt'n Midnight

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Different types
one is just an inductor and capacitor in parallel, they resonate at a particular radio frequency generated in the posts at the barrier

in the future RFID will be used. this means the on board chip takes radio energy from the scanner and uses it to transmit a number or 1KB of data or whatever which the scanner can use - systems in use can work up to 30m away.

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#3 02-03-2005 1:12pm

amen

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where did u see rfid up to 30m ?

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#4 02-03-2005 5:48pm

bonkey

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google for 'rfid 30m distance'

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#5 02-03-2005 8:19pm

themole

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the one in the NUIG library is based on the stickers with the number, on the spine. that is why they rub the spine with the machine.

as to the actual physics involved its prob come kind of charged capacitor/inductor schenanigans.

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