Wireless whispering-gallery-mode sensor for thermal sensing and aerial mapping

Xiangyi Xu; Weijian Chen; Guangming Zhao; Yihang Li; Chenyang Lu; Lan Yang

doi:10.1038/s41377-018-0063-4

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Wireless whispering-gallery-mode sensor for thermal sensing and aerial mapping

Letter

- Wireless whispering-gallery-mode sensor for thermal sensing and aerial mapping
- Wireless whispering-gallery-mode sensor for thermal sensing and aerial mapping
- 光：科学与应用 2018年7卷第5期页码：325-330
- Affiliations：
  
  1.Department of Electrical and Systems Engineering, Washington University, St. Louis, MO, 63130, USA
  2.Department of Computer Science and Engineering, Washington University, St. Louis, MO, 63130, USA
- Author bio：
  
  Lan Yang (yang@seas.wustl.edu)
- Funds：
- DOI：10.1038/s41377-018-0063-4
  中图分类号：
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Xiangyi Xu, Weijian Chen, Guangming Zhao, 等. Wireless whispering-gallery-mode sensor for thermal sensing and aerial mapping[J]. 光：科学与应用, 2018,7(5):325-330.

Xu, X.Y. et al. Wireless whispering-gallery-mode sensor for thermal sensing and aerial mapping. Light: Science & Applications, 7, 325-330 (2018).
Xiangyi Xu, Weijian Chen, Guangming Zhao, 等. Wireless whispering-gallery-mode sensor for thermal sensing and aerial mapping[J]. 光：科学与应用, 2018,7(5):325-330. DOI： 10.1038/s41377-018-0063-4.

Xu, X.Y. et al. Wireless whispering-gallery-mode sensor for thermal sensing and aerial mapping. Light: Science & Applications, 7, 325-330 (2018). DOI： 10.1038/s41377-018-0063-4.

摘要

Abstract

The Internet of Things (IoT),1,1,2,2, employs a large number of spatially distributed wireless sensors to monitor physical environments, e.g., temperature, humidity, and air pressure, and has many applications, including environmental monitoring,3,3, health care monitoring,4,4, smart cities,5,5, and precision agriculture. A wireless sensor can collect, analyze, and transmit measurements of its environment,1,1,2,2,. Currently, wireless sensors used in the IoT are predominately based on electronic devices that may suffer from electromagnetic interference in many circumstances. Being immune to the electromagnetic interference, optical sensors provide a significant advantage in harsh environments,6,6,. Furthermore, by introducing optical resonance to enhance light–matter interactions, optical sensors based on resonators exhibit small footprints, extreme sensitivity, and versatile functionalities,7,7,8,8, which can significantly enhance the capability and flexibility of wireless sensors. Here we provide the first demonstration of a wireless photonic sensor node based on a whispering-gallery-mode (WGM) optical resonator, in which light propagates along the circular rim of such a structure like a sphere, a disk, or a toroid by continuous total internal reflection. The sensor node is controlled via a customized iOS app. Its performance was studied in two practical scenarios: (1) real-time measurement of the air temperature over 12 h and (2) aerial mapping of the temperature distribution using a sensor node mounted on an unmanned drone. Our work demonstrates the capability of WGM optical sensors in practical applications and may pave the way for the large-scale deployment of WGM sensors in the IoT.

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references

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