This average is then put in a regression model that estimates temperature.ĭr. Temperature is measured by recording the phase difference during 10 seconds. With this information, the system is able to effectively estimate temperature in the estimation stage. During this step, the reader continuously reads the tag-pair and records all responses This stage aims to figure out the effect temperature has on this system. The calibration step is a quick but essential step performed during installation that does not need to be repeated even when tag orientation or distance changes. RTSENSE consists of 2 stages, calibration and estimation. Lili Qiu essentially designed an analytical model that observes the change in electrical resistance in a passive tag caused by temperature change. The idea behind RTSENSE, the name of the RFID system that Pradhan and his team use to measure temperatures, is fairly simple to understand. These aspects of passive RFID tags make them perfect for sensory appliances. The radio frequency wave from the antenna energizes the tag, then it sends back information encoded in its memory back to the antenna. They operate purely by absorbing radio frequency energy transmitted from RFID antennas. The circuit chips have no energy of their own-they don’t have a battery and are also not connected to an outlet. Passive RFID tags are made up of two components: an antenna and an integrated circuit chip (the actual tag). Passive RFID tags have existed for almost twenty years now, mainly used for identification and tracking. Lili Qiu explores how passive RFID tags could solve this problem of battery-dependent sensory devices. In his research article, “ RTSense: RFID based Temperature Sensing,” which was recently presented in ACM SenSys 2020, Dr. Swadhin Pradhan currently works at Cisco Meraki and researches wireless systems, machine learning, and internet-of-things (IoT) systems. Swadhin Pradhan, with assistance from his advisor Professor Lili Qiu, has dedicated his work to. It is this type of research that UT Computer Science researcher and recent PhD graduate Dr. To tackle such a problem we need to figure out ways to transfer energy from a consistent power source, such as outlets, without the use of wires. One of the main reasons battery devices are popular among sensory appliances is convenience: no one wants a wire stretching from an outlet to a thermostat. A challenge today in the tech industry is figuring out ways to reduce the reliance on batteries for sensory appliances. These batteries must be constantly replaced and over time become time-consuming and costly. When it comes to such devices, the use of batteries is unnecessary and becomes a hindrance. We also use batteries for essential, non-portable electronic devices, such as thermostats and many other sensory appliances. However, our usage of batteries extends further from just portable electronic devices. Batteries are currently popular because they are able to make electric devices, such as flashlights and watches, portable. When was the last time you changed out a battery in your house? Studies show that battery-powered devices are used substantially in modern times, Americans use nearly 3 billion batteries every year.
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