Thermal imaging sensors that detect and record human body temperature have recently begun
In these circumstances, the smartphone industry is actively considering the possibility of enabling such sensors portablely to gain the additional function of real-time temperature measurement.
Research team led by Dr.Won Jung Choi from the Center for Optoelectronic Materials and Devices at the Korea Institute of Science and Technology (KIST) has developed a thermal imaging sensor that can operate at temperatures up to 100 ° C without a cooling device: it is planned that the price of the new sensor will be several times lower than analogs, therefore it can be massively used in smartphones and autonomous vehicles.
For integration with smartphone equipment andIn autonomous vehicles, sensors must operate reliably at high temperatures: 85°C and 125°C, respectively. In order for conventional thermal imaging sensors to meet this criterion, they require an independent cooling device. However, high-quality cooling devices are expensive and, moreover, do not make the sensor suitable for operation at temperatures up to 85°C. Therefore, the usual method is not suitable.
In a new work, the authors created a device onbased on a film of vanadium dioxide (VO2) -B, it is stable at 100 ° C. 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 imaging sensors.
The device was able to obtain the same levelinfrared signals at a temperature of 100°C, the same as at room temperature. Additionally, heat signatures were detected with three times greater sensitivity. The device operates with a response of 3 milliseconds: this is 3-4 times faster than usual. These fast response speeds allow the device to capture thermal images at 100 frames per second, significantly faster than the typical 30-40 frames per second.
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