This paper introduces a prototype of a low-energy high-temperature exposure sensor, which is a temperature-sensitive passive UHF RFID tag that bends forward when exposed to warm air. This “Bending Tag” design is based on a simple dipole antenna fabricated from an electro-textile material. The antenna has a 3D-printed substrate, which is constructed from a commercial Thermo Reactive Filament that gets soft when exposed to 50°C for 30 seconds, causing the tag to bend forward and curve. The sensor tag initially has a read range of more than 6 meters throughout the global UHF RFID frequency band. After bending, there is a significant decrease in the read range (to around 2–3 meters), which is caused by the changed backscattered power of the sensor tag. In an office environment, the backscattered power changes from −36 dBm to −43 dBm. The change in a sensor tag-reference tag system as dP% is approximately 70%. Based on these initial results, our bending tag can be further developed to work as a cost-effective low-energy sensor for monitoring high-temperature exposure.

中文翻译：

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弯曲的无源RFID标签作为高温暴露的传感器

本文介绍了一种低能耗高温暴露传感器的原型，该传感器是一种对温度敏感的无源UHF RFID标签，当暴露在温暖的空气中时，它会向前弯曲。这种“弯曲标签”设计基于由电纺织材料制成的简单偶极子天线。天线具有3D打印的基板，该基板由市售的热反应丝制成，当暴露于50°C 30秒后会变软，从而导致标签向前弯曲。传感器标签最初在全球UHF RFID频段的读取范围超过6米。弯曲后，由于传感器标签的反向散射功率发生了变化，导致读取范围显着减小（大约2至3米）。在办公环境中，反向散射功率从-36 dBm变为-43 dBm。传感器标签参考标签系统的dP％变化约为70％。基于这些初步结果，我们的弯曲标签可以得到进一步开发，以用作监控高温暴露的经济​​高效的低能耗传感器。