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RFID tags in the environment perception chemicals and gases

by:JLTcard     2020-11-19
Automatic identification laboratory at the Massachusetts institute of technology ( Auto- 识别实验室) Has long been in RFID research frontier. Laboratory will sensor functions into RFID tags, developed a working in uhf ( UHF) Band RFID tags, can measure glucose levels, and to forward the information. In the future, the team plans to use the chemicals and gases from the RFID tags to perceive the environment, such as carbon monoxide. Involved in the research of mechanical engineering at the Massachusetts institute of technology graduate student Sai Nithin Reddy Kantareddy said that for a long time, researchers have been trying to extend the function of RFID, RFID tag will have a sensing capability in various places, of the huge cheap detection network, used to detect carbon monoxide or ammonia, without batteries. Kantareddy and research scientists, Rahul Bhattacharya and open learning at the Massachusetts institute of technology, vice President and Daniel Fort Flowers mechanical engineering professor Sanjay Sarma jointly developed the new RFID tags. Sarma said, RFID tag is the most cheap, low power consumption rf communication tools. Therefore, the RFID tag fusion sensing function, is a milestone in the research of Internet of things. Antenna centered design before be multipath interference, there are different types of RFID tags, including the onboard battery active RFID and passive RFID without battery. Both tag contains a small antenna, the user can through the information in the tiny chip reader to read the label. Active RFID tags without external power, and the launch of the microwave passive RFID tags through the reader to obtain energy. Researchers have been trying to in a passive RFID tags into the sensor function. Efforts in the direction of mainly includes the research and development to respond to specific factors of environment of the antenna, and then send the reader antenna of different frequency or different signal intensity data, show that detected a substance. Sarma, for example, before the team designed a RFID tag antenna, will be under different humidity in different wave transmission signal. They also design the RFID tag can pass close to vascular cognitive anemia. Kantareddy think, however, this particular reaction antenna has a weakness, is the multipath interference ( 多路径干扰) 。 The reader receives is not only a direct response signals from RFID tags, and direct response signal to the reader via environment reflection multipath signals. Multipath signals will interfere with the normal receiving of information, lead to false alarm or warning. New design based on chip Sarma team path, on a chip. They are on the market procurement in the semi-active ( With battery, but not active transmitting) And passive RFID chips two modes, then add the standard for the antenna. Then, they sell the chip attached design in the city of new chips, makes the chipset only under specific environment stimulate activating semi-active RFID mode, launch a specific set of signals. The signals and passive RFID mode is different, can appear reliably inform receiver environment of a particular matter. Kantareddy said that this scheme is based on more reliable RFID antenna sensor technology, users less susceptible to the interference of multipath effect. Next, the team will focus on studying the new data formats and enhance the power of transmitting, further improve the reliability of sending data, reduce the false alarm probability. Bhattacharyya stressed that the new scheme is solved based on the RFID antenna sensor technology is facing a big problem - — A lot of RFID tags at the same time launch interfere with each other. Before a large number of short distance of a passive tag made confused user, you can now put the reader in the distance, only when the environment really appeared certain substances, reader will alert. Plug and play type sensor in the demonstration experiment, the team presented a glucose sensor based on commercial building RFID glucose sensor. When glucose in contact with the tag, sensor electrolyte of chemical reaction, generate electricity, provides extra energy to RFID. Then, RFID tags from passive mode, transformation to the semi-active mode. Add the more glucose, the longer the duration of the active mode is. Kantareddy said the user a received signal model of semi-active, the label has been found that glucose is known. Users can also according to the duration of the semi-active model, further to determine glucose levels. Of course, at present the performance of the new RFID glucose detector is less mature market is glucose detector. Kantareddy said, at present the team's main goal is not to develop glucose detector, but shows that the new RFID detector can be better than traditional based on RFID antenna detector signal in a reliable way. In addition, the new RFID detector is more efficient, because on the one hand, in the absence of sensor to the target material, RFID tags work in passive mode, is not power; Environment of the target material itself, on the other hand, also can produce energy when contact detector, so process cost for sending the battery is not much. The launch of the signal at present, the new RFID tags can receive within 10 metres away, and existing technology can only guarantee - 1 2 meters outside the receiving. Next, the team plans to develop a kind of carbon monoxide detector. Kantareddy pointed out, based on the RFID antenna sensor design, for each specific target material, need to design the antenna. And the new design without antenna replacement, need to join the target material test chip. As a result, the new can deploy large area, low cost RFID sensor used for boiler, pipelines and other key for 'plug and play' type of monitoring system. return
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