[LINK] RFID criticism
glen.turner at aarnet.edu.au
Mon Nov 1 11:02:58 EST 2004
rchirgwin at ozemail.com.au wrote:
> Out in the noisy street, 20 metres is pure fantasy, "inevitable improvements in technology" notwithstanding.
How do you figure? The article says the range is 1m for some
tags and 3-4m for others.
I can easily overcome street noise using a directional antenna,
and all I need to do is to build an antenna with has greater
gain than the store's antenna (the gain of which is limited by
physical issues -- you're unlikely to see a waveguide at the end
of the cash register).
The greatest problem is a free-space view of the RFID item.
That depends upon the store layout, etc.
If RFID gets supermarket deployment then I reckon that I could
put a parabolic antenna/waveguide on the footpath outside the
Woolies in Rundle Mall and read each item as it passes through
the supermarket's scanner (5-10m away). Imagine that with
a camera pointing at the cash register, a sign saying "what
this person is buying", and a big screen with a description of
the item and the person's image.
It would make a great Fringe Festival event. It would be
worthwhile doing just to watch the state government and
Woolies fumble about for a law to use to shut the thing
down. Having sucessfully offended people with my last
Fringe work, I'd like to thank you for an even better idea
for a follow-up :-)
Glen Turner Tel: (08) 8303 3936 or +61 8 8303 3936
Australia's Academic & Research Network www.aarnet.edu.au
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