![]() ![]() ![]() Battery-assisted tags include a small battery that powers this chip. Both types of tags contain a small antenna which communicates with a remote reader by backscattering the RF signal, sending it a simple code or set of data that is stored in the tag’s small integrated chip. “When generic RFID chips can be deployed to sense the real world through tricks in the tag, true pervasive sensing can become reality.”Ĭurrently, RFID tags are available in a number of configurations, including battery-assisted and “passive” varieties. “RFID is the cheapest, lowest-power RF communication protocol out there,” Sarma says. The researchers presented their design at the IEEE International Conference on RFID, and their results appear online this week. Kantareddy developed the sensor with Rahul Bhattacharya, a research scientist in the group, and Sanjay Sarma, the Fred Fort Flowers and Daniel Fort Flowers Professor of Mechanical Engineering and vice president of open learning at MIT. You could deploy these cheaply, over a huge network.” “Imagine creating thousands of these inexpensive RFID tag sensors which you can just slap onto the walls of an infrastructure or the surrounding objects to detect common gases like carbon monoxide or ammonia, without needing an additional battery. “People are looking toward more applications like sensing to get more value out of the existing RFID infrastructure,” says Sai Nithin Reddy Kantareddy, a graduate student in MIT’s Department of Mechanical Engineering. In the future, the team plans to tailor the tag to sense chemicals and gases in the environment, such as carbon monoxide. They have developed a new ultra-high-frequency, or UHF, RFID tag-sensor configuration that senses spikes in glucose and wirelessly transmits this information. Now engineers in this group are flipping the technology toward a new function: sensing. The Auto-ID Lab at MIT has long been at the forefront of developing RFID technology. In addition to keeping tabs on products throughout a supply chain, RFID tags are used to trace everything from casino chips and cattle to amusement park visitors and marathon runners. When slapped on a milk carton or jacket collar, RFID tags act as smart signatures, transmitting information to a radio-frequency reader about the identity, state, or location of a given product. Often, these tags come in the form of paper-based labels outfitted with a simple antenna and memory chip. These days, many retailers and manufacturers are tracking their products using RFID, or radio-frequency identification tags. ![]()
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