RE: Re: RFID Human Implants - Occupancy Detection

["Ward, David" <DAvid.Ward@xxxxxxxxxx>]

Ooops : Regarding my earlier comments about your esteemed leader Iain ;-)

It's also worth noting that the implants in cats and dogs can also become
'mobile' and may not necessarily still be positioned where they were
initially inserted.

The cheap readers I have use a short (ferrite cored I think) antenna coil
and these will pickup a signal from the embedded RFID from a distance of
only 10-20mm.  A larger coil would be needed to have any chance of using
these in this application...  unless the antenna was coated with catnip, in
which case the Cat would 'swipe' itself on the reader ;-D

I've also seen an active collar tag that used IR to transmit an ID, but
this
does presume that the animal wears a collar

Dave

/P.S.  'He' doesn't neurologically subscribe to this list does he?



-----Original Message-----
From: Iain Goodhew [mailto:iain.goodhew@xxxxxxx]
Sent: 28 January 2005 08:56
To: ukha_d@xxxxxxx
Subject: RE: [ukha_d] Re: RFID Human Implants - Occupancy Detection



The main problem here is the readable range of the implanted
microchip. The
pet rfID tags are about 2.1mm in diameter and 10mm long. This
means the coil
of wire in the tag used to both power the chip, and transfer
the data back
to the reader is tiny and works only over a limited range. The handheld
readers work by stroking the pet with the reader antenna, hence
the required
range is only a few millimeters. The chips are generally
implanted in cats
between the shoulder blades or sruff of the neck. The pet door
would need to
either have some sort of tunnel the pet travels through first (aka
flocontrol) with the reader antenna, or the range of the reader
needs to be
12-15cm, to allow the door to unlock before the cat enters. The
tunnel idea
is a problem when retrofitting to a standard house door as it
gets in the
way of the doors operation, hence is probably not a marketable product.

The read time is less of a concern as the whole bit stream is
about 128bits
and can be read in about 10ms IIRC.



Iain Goodhew (Working with the Captain Cyborg)

Cybernetics

University of Reading



_____

From: David Buckley [mailto:db@xxxxxxx]
Sent: 28 January 2005 06:32
To: ukha_d@xxxxxxx
Subject: [ukha_d] Re: RFID Human Implants - Occupancy Detection




--- In ukha_d@xxxxxxx, Richard Malcolm-Smith <rich@i...> wrote:
> Ward, David wrote:
>
> Is there a cat door that will operate based on rfid available yet?

Around feb 2002 the missus came up with the idea that a cat door could
incorporate a microchip reader, to read the chip that cats routinely
have implanted

"The usual mechanism is the implantation of an electronic identity
device into the pet.  Such devices are usually compatible with ISO
standards 11784 and 11785.  A hand-held scanner capable of reading the
implanted microchip is used to manually identify the pet as required.
These microchips when read return a pre-programmed string.  In the
most common embodiments, these strings are numeric sequences, usually
between ten and fifteen digits long.  For most practical purposes, the
microchip number of a pet can be considered unique, and most unlikely
to replicated in another pet living nearby.

The object of this invention is to bring together the pet door with
pet microchip technology to deliver a truly selective pet door.
Accordingly, this invention describes a selective pet door capable of
reading and reacting to implanted pet microchips."

And back to HA:

"With the addition of a serial or other data port, an external
intelligent apparatus (for example, a computer,  home automation or
security system) could be aware of whether the pet(s) are in or out."


Was never filed.....