IR Chemical Communication Graffiti Tags Wanted By DARPA
The Chemical Communications (ChemComm) program objective is to encode and transmit information in a rapid and covert manner. DARPA is asking for proposals for a PDA-sized device that will quickly print out coded tags, with a specific message, for placement in strategic locations in different environments, to be read by unmanned aerial vehicles (UAVs) or planes. The tags will be used to mark locations of interest, identify friendly forces embedded or trapped in combatant zones, and in various surveillance and reconnaissance missions.
Specifically, DARPA wants these features:
- Permits the user to input an arbitrary 60-character alphanumeric message;
- Translates the message into an appropriate set of modulated chemistries;
- Embeds these chemistries into a disposable substrate (the transmitter); and
- Ejects the substrate for deployment.
DARPA suggests that oscillating chemical systems could form time-repetitive sequences of characters, or that a chemical shutter could generate a modulated optical signal from one static chemical function. However, any innovative approach that meets the goals of the proposal will be considered.
DARPA envisions the disposable transmitter having a "weight and form factor ranging from a sheet of paper to a piece of string, possibly with an adhesive backing for deployment on all surfaces."
The "substrate" or transmitter is thus a graffiti tag, but not like the ones that you see in alleys and on trains. DARPA prefers that the message be transmitted invisibly, using near infrared (NIR) or short-wave infrared (SWIR).
Science fiction writers could make several suggestions here. For one thing, you will want a strongly adhesive backing that would resist any efforts to remove it. In other words, a smart tag as described in All Tomorrow's Parties, a 1999 novel by William Gibson:
Someone had once come up with a smart tag, a sort of decal they'd somehow adhered to the [smart] wall, although [they] had not been able to figure out how they'd done it without being seen. Maybe they'd shot it from a distance.
(Read more about the smart tag)
Smart tags were created in response to smart material, a special finish that would "eat" graffiti, which would be the expected enemy response to DARPA ChemComm tags:
The gang kids would come and tag it; twenty minutes later these flat, dark, vaguely crab-like patches of dark blue would come gliding out around the corner… They seemed to be embedded, a few millimeters down into the surface, which was a sort of non-glossy gel-coat affair, but able to move around under there.
(Read more about smart material)
DARPA also does not specify what the transmitter, ideally a "sheet of paper," should look like. If it covers a surface that is visible to a UAV, a person might also be able to see it. The sheet should therefore look like it belonged there.
One approach would be to disguise it as anti-American graffiti or posters of local political figures. Graffiti in Baghdad was once punishable by death; now it is commonplace.
However, in villages, Iraqi army soldiers and Multinational Division–Baghdad patrols often paint over graffiti whenever they see it. You don't want your own troops painting over your expensive DARPA-produced ChemComm tags.
(Child paints over graffiti)
The other obvious thing to do is to make the tags invisible. They could be made of clear, non-reflective plastic, or the tags could actually be invisible. See Invisibility Cloaks Seen As Possible With Metamaterials and Invisibility Possible With Superlenses for details on progress in this area.
As with any DARPA proposal, the technologies are years away from being usable. However, if DARPA wants to get started right away with a quick, homebrew technology that already works, they should try making some LED Throwies.
An LED Throwie is basically a light-emitting diode taped to a small circular battery, in turn taped to a small circular magnet. Change the standard instructions by using an infrared LED, then add a little IC that accepts your 60 character code and transmits it in the DARPA-approved manner, and presto! your chemical communications gear is ready and you can start tagging.
(LED Throwie enthusiasts tagging a building)
I also wonder whether or not DARPA is thinking far enough out of the box on this one. For example, why not have this robot painter actually create a composition on the roof or the wall, using chemical paints that provide the necessary signalling features?
Read more about the DARPA Chemical Communications (ChemComm) program. Take a look at these instructions for making an LED Throwie, as well as a movie demonstrating LED Throwie tossing technique. See science-fictional technologies come to life in this DARPA project list.
Scroll down for more stories in the same category. (Story submitted 3/29/2007)
Follow this kind of news @Technovelgy.
| Email | RSS | Blog It | Stumble | del.icio.us | Digg | Reddit |
you like to contribute a story tip?
Get the URL of the story, and the related sf author, and add
Comment/Join discussion ( 2 )
Related News Stories -
UK Police AI To Stop Criminals Before They Strike
'... the computing mechanisms that studied and restructured the incoming material.' - Philip K. Dick, 1956.
Chinese Face Recognition Mistakes Bus Ad For Jaywalker
'... the imprint of her image on the telephoto cell.' - Schachner and Zagat, 1931.
China's Social Credit System - A Facebook-1984 Mashup
'Prestige, face, mana, repute, glory: the Sirenese word is strakh.' - Jack Vance, 1976.
Chinese Watrix Gait Recognition Watching You Always
'... those pesky gait-recognition cameras.' - Cory Doctorow, 2008.
Technovelgy (that's tech-novel-gee!)
is devoted to the creative science inventions and ideas of sf authors. Look for
the Invention Category that interests
you, the Glossary, the Invention
Timeline, or see what's New.
Spicy Tomatoes Created With Genetic Engineering
How about mashed potatoes and brown gravy?
Driverless Hotel Rooms Predicted In 1828
'Did you never see a moving house before?'
Yandex Self-Driving Taxi Is Very Smooth
'The big car was slowing down, its computer brain sensing an exit ahead.'
Shrimp Actually Made Of Algae Is A New Wave Food
Bring in that crop algae.
Cosplay Style Wings Could Work On Moon
'They're lovely! - titanalloy struts as light and strong as bird-bones...'
Tesla Model 3 Has Outside Speaker Grille
Robert Heinlein does it again.
Arizona Luddites Attack Self-Driving Vehicles
'Trucks don't drive by themselves...' Or do they?
Organaut! Russians 3D Print Living Tissue In Space
'For a while your colonists will have to come up [to orbit] to the Hospital...'
WINE Spacecraft To Extract Water From Asteroids
'Yes, strangely enough there was still sufficient water beneath the surface of Vesta.'
Japanese Swordsmiths Take On Asteroids
'... a tiny, rocket-powered projectile, drove towards the mysterious bulk.'
Saturn's Rings To Vanish, Let's Mine Them While We Can
'...the valuable shards of what had once been satellites.'
Humans Could Take Up A LOT Less Space
We'd have a lot more room for gardening...
Implosion Fabrication Shrinks 3D Objects To Nanoscale
'Carter had watched miniaturization a hundred times...'
GMO Houseplant Cleans Your Air
Removes compounds too small to be captured by a HEPA filter.
Nova Meat Can 3D Print Your Dinner
Printing out chicken nuggets.
MIT Scientists Create 'Peek-a-Boo Prober' From Jetsons
Well, George, it's the latest thing.
More SF in the News Stories
More Beyond Technovelgy science news stories