I am a fan of science fiction and so I am used to science fiction stories that depict more and more intelligence in the equipment and machinery that we use (just check
Philip K. Dick's fiction, which is full of such intelligent - and sometimes dumb - machinery).
I was staying at a hotel in Brussels tonight and when I opened the door of the minibar, I saw a sign stating that "any minibar item that you take out will immediately be charged to your room, even if you do not use it". How so? It seemed to suggest that there was a kind of automated system that could detect that a beverage was taken out of the refrigerator and could charge it to your room. I checked carefully but did not see any such technology.
However, this is not exactly rocket science. I have been involved since a few years in
RFID technology.
RFID stands for Radio-Frequency Identification. It involves using radio waves to identify an object or person through a "tag" attached.
There are basically two main types of RFID equipment presently available.
Active RFID tags have a power source and can broadcast a signal in response to a polling request by an RFID reader. They typically have a range of about 100 meters, so they can be used on moving vehicles and do not need to be read by a handheld device. These are typically used for containers, big boxed, vehicles and other moving packaging options.
The Passive RFID concept is similar to the barcode concept, namely they are used to track single items os a collection of similar items. They do not have a power source, so they have to be explicitly read from short distance (a few meters).
There has been a lot of interest in RFID technology lately. There are many applications in the military world, and also in supply chain management systems. One of the most high-profile stories was Walmart moving to RFID technology and also asking all its suppliers move to the same technology as well. There were also privacy concerns about items bought being "trackable" for at least a period of time, enabling supermarkets to track their customers shopping patterns, then utilizing that data (even worse, selling the data to third parties).
So, in a sense, my initial idea that the refrigerator might have such a technology did not really arise from my many hours of science-fiction reading, but from a very plausible near-real time scenario where a lot of things, includsing people themselves being tracked via RFID tags. It is easy to imagine a dystopian world where everyone is tracked continuously via RFID chips embedded under their skin, using omnipresent RFID readers. Sound familiar, anyone?
(For some good insight into RFID technology, check the
RFID Journal, a free Internet journal that covers all RFID stories or
The Wireless Report, a blog that covers all wireless equipment, including RFID devices)
(Post scriptum: They do it indeed! I got the bill early next morning, and lo and behold, they showed the items I had used at night. Blimey! I had a quick look, and it is a quite simple idea, namely they got sensors at the fixed locations for minibar items and they can detect when something is taken out)