Wang Fuwei, Sun Rong, Zhang Xuechen, Liu Yanzheng, Qi Mei, He Chen
School of Information Technology, Northwest University, Xi'an, 710127, Shaanxi, China.
PLA 63750 Military Hospital, Xi'an, 710005, Shaanxi, China.
Sci Rep. 2024 Dec 30;14(1):31753. doi: 10.1038/s41598-024-82874-x.
Passive temperature sensing systems based on the Internet of Things (IoT) present an efficient, reliable, and convenient solution for temperature monitoring with extensive application prospects and market value. This paper introduces a passive, battery-free, chipless, metasurface temperature sensing tag. The key insight is that the sensing tag uses vanadium dioxide ([Formula: see text]) to solve the problems of measuring distance, large size, and high cost related to active devices. The sensing tag fabricated with tungsten-doped [Formula: see text] powder demonstrated a significant variation in the reflection magnitude within the temperature range of 34-42 °C. It was achieved through coating, sintering, metasurface design, and ion beam etching. Experimental results showed that the square resistance of the prepared coating decreased from 1003 to 90 [Formula: see text] as the temperature increased from 34 to 42 °C. Additionally, the reflection magnitude of the tag significantly increased with the temperature decrease in the 3.5-5.27 GHz frequency band. These results indicate that the passive temperature sensing tags can achieve rapid and accurate temperature sensing within the 34-42 °C range.
基于物联网（IoT）的无源温度传感系统为温度监测提供了一种高效、可靠且便捷的解决方案，具有广阔的应用前景和市场价值。本文介绍了一种无源、无电池、无芯片的超表面温度传感标签。关键在于该传感标签使用二氧化钒（[化学式：见原文]）来解决与有源器件相关的测量距离、尺寸大以及成本高的问题。用钨掺杂的[化学式：见原文]粉末制造的传感标签在34 - 42°C温度范围内反射幅度有显著变化。这是通过涂层、烧结、超表面设计和离子束蚀刻实现的。实验结果表明，随着温度从34°C升高到42°C，制备的涂层的方阻从1003降至90[化学式：见原文]。此外，在3.5 - 5.27 GHz频段内，标签的反射幅度随温度降低而显著增加。这些结果表明，无源温度传感标签能够在34 - 42°C范围内实现快速准确的温度传感。
