MIT engineers develop RFID sensors

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RFID tags do not require batteries, but gather the small amounts of energy they need from the radio waves that connect them. RFID tags are now widely used in logistics management, entertainment site passenger flow management and sports management of various products. They are mainly used to track the identity, status and location of goods.

The Auto-ID Lab at the Massachusetts institute of technology has long been at the forefront of RFID technology. Now, MIT engineers have found a way to configure RFID tags as sensors. Automatic identification of the Massachusetts institute of technology (MIT) Auto-ID Lab announced a new kind of UHF RFID sensor configuration, the configuration will continue to develop, low cost, reliable equipment, used to detect harmful chemicals in the environment.

In a demonstration, the team created a commercial glucose sensing electrode filled with an electrolyte called glucose oxidase. The team explained that when the electrolyte interacts with glucose, the electrodes create an electric charge that acts as a local energy source or battery.

The researchers attached the electrodes to an RFID tag’s memory chip and circuitry. When they add glucose to each electrode, the resulting charge causes the chip to switch from a passive RF power mode to a locally charged auxiliary power mode. The more glucose they added, the longer the chip stayed in secondary power mode.

The team now plans to develop an RFID carbon monoxide sensor that combines the design with different types of electrodes to generate electric charge in the presence of gases.

“People are looking for more applications, like getting more value out of existing RFID infrastructure,” said Sai Nithin Reddy Kantareddy, a graduate student in the department of mechanical engineering at the Massachusetts institute of technology.

 

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