LifeTrack technology RFID tags|
Simplify temperature monitoring
Which would you rather do?
Traditional temperature logging methods
are fragile and hard to implement. The RFID tag must send out a stream
of raw time and temperature tracking data, which must be interpreted by a
remote computer before any fitness for use decision can be made. This
adds a lot of hardware and software complexity to the system, and
communication delays or failure can degrade reliability.
By contrast, LifeTrack
technology requires relatively little code space, and can be implemented in
nearly any battery assisted EPCglobal Gen-2 compatible RFID tag. Field implementation is robust,
and requires little or no modification to existing equipment. The tags
can be programmed to:
product lifetime status using 16 bits of the tag's user memory
additional statistical data using 32 bits of the tag's user memory
Send a log of
key lifetime milestones using 128 bits of the tag's user memory
stability monitoring, airplane "black box" style, temperature recorder and
efficient transmission formats enable sophisticated time-temperature
stability status and history data to be transmitted in the very limited number of
user data bits allocated by the EPCglobal Gen-2 standard.
The graph below shows some
of the forensic logging data that can be output using only 128 bits
(16-bytes) of EPC-Gen2 data storage memory. In this example, a
refrigerated product with a nominal 2.5 year storage life was accidentally
left at room temperature for two days on days 273-275 after shipment.
This used up about 50% of the product's lifetime. After two days at
room temperature, the unexpired product was then placed back into
refrigerated storage for the remainder of the product's storage life.
In the graph below, larger bubbles represent storage at higher
RFID tag logger output (128-bit data memory)
The LifeTrack RFID tag logger output shows this problem at a glance.
The three large bubbles on days 273-275 (x-axis) and between 40% and 80%
expiration (y-axis) show the results graphically. Numeric data
output (not shown) allow the time, magnitude, and duration of the
temperature excursion to be precisely determined.
Yes, we can do bananas!
Carolyn Walton, vice president of IT for
Wal-Mart, in a recent
March 2006 conference urged RFID and sensor technology to: "Think about
bananas…I'll bet you didn't know what happens along that journey."
LifeTrack can do bananas, as
well as other environmentally sensitive materials with defined time-temperature degradation
or ripening curves. With our very efficient EPCglobal Gen-2 data
logging techniques, we can tell you exactly what happens along that journey.
So yes, we can do bananas,
we can do
with today's hardware:
LifeTrack stability monitoring
technology can be implemented on single chip, flash programmed,
ultra-low-power microprocessor - RF transceiver chips, such as the TI
Chipcon family, presently available in about the $2.00 price range.