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Super sensor to check the temperature even with the smartphone

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ROMA – We are still in laboratory tests but the developments seem very suggestive. At its core is low-cost thermal imaging sensor technology that works well in temperatures up to 100 degrees and that could be implemented even on a simple smartphone. The experimentation is thanks to the researchers of the National Research Council of Science & Technology of South Korea. The applications of the new study, published in ScienceDirect, could range from smartphones to self-driving vehicles.

Thermal imaging sensors, which detect and capture images of the heat signatures of human bodies and other objects, have recently been used in thermostats to control facial temperatures in an effort to prevent the spread of Covid-19. Under these circumstances, the smartphone industry is actively considering integrating such sensors as portable functionality to create the additional real-time temperature measurement function. A research team, led by Won Jun Choi at the Center for Opto-Electronic Materials and Devices at the Korea Institute of Science and Technology (KIST), announced the development of a thermal image sensor that overcomes existing problems of price, operation and temperature limits. The sensor developed in this work can operate in temperatures up to 100 degrees centigrade, without a cooler, and should be more affordable than standard sensors on the market, which in turn would pave the way for its application on smartphones and self-driving vehicles. autonomous.

To be integrated with the hardware of smartphones and autonomous vehicles, the sensors must work stably without difficulty at high temperatures of 85 degrees and 125 degrees, respectively. For conventional sensors to meet this criterion, an independent cooling device would be required. However, the high-end coolers, which promise the necessary quality, are priced at around 1500 euros. The joint research team of KIST and Sungkyunkwan University has developed a device that uses a 100-degree stable vanadium dioxide (VO2-B) film. This device detects and converts infrared light generated by heat into electrical signals; this eliminates the need for cooling devices, which account for more than 10% of the cost of thermal image sensors and consume large amounts of electricity. The device was able to achieve the same accuracy of infrared signals at 100 degrees as at room temperature.

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“Thanks to our work with convergence research in this study – explained Dr. Choi – we have developed a technology that could drastically reduce the production cost of thermal image sensors. Our device, compared to more conventional ones, has reactivity and faster operating speeds. We expect this to accelerate the use of thermal imaging sensors in the military supplies, smartphone and autonomous vehicle industries. “

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