期刊
ACS APPLIED MATERIALS & INTERFACES
卷 14, 期 12, 页码 14447-14454出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c23716
关键词
proximity-contact sensing; human-machine interaction; optical microfiber; wearable tactile sensor; humidity sensor
资金
- National Natural Science Foundation of China [61975173, 62075192]
- Major Scientific Research Project of Zhejiang Lab [2019MC0AD01]
- Key Research and Development Project of Zhejiang Province [2021C05003]
- Natural Science Foundation of Zhejiang Province [LQ21F050001, LQ22F050021]
- CIE-Tencent Robotics X RhinoBird Focused Research Program [2020-01-006]
A dual-modal sensor inspired by the somatosensory system of human skin is reported. It is capable of detecting finger approaching and touching by measuring relative humidity and force-triggered light intensity variations. The sensor achieves continuous detection of finger movements, including approaching, contacting, pressing, releasing, and leaving, with features like fast response, high sensitivity, and wide working range.
The monitoring of proximity-contact events is essential for human-machine interactions, intelligent robots, and healthcare monitoring. We report a dual-modal sensor made with two functionalized optical microfibers (MFs), which is inspired by the somatosensory system of human skin. The integrated sensor with a hierarchical structure gradationally detects finger approaching and touching by measuring the relative humidity (RH) and force-triggered light intensity variations. Specifically, the RH sensory part shows enhanced evanescent absorption, achieving a sensitive RH measurement with a fast response (110 ms), a high resolution (0.11%RH), and a wide working range (10-100%RH). Enabled by the transition from guided modes into radiation modes of the waveguiding MF, the force sensory part exhibits a high sensitivity (6.2%/kPa) and a fast response (up to 1.5 kHz). By using a real-time data processing unit, the proximity-contact sensor (PCS) achieves continuous detection of the full-contact events, including finger approaching, contacting, pressing, releasing, and leaving. As a proof of concept, the electromagnetic-interference-free PCS enables a smart switch system to recognize the proximity and contact of bare/gloved fingers. Moreover, skin humidity detection and respiration monitoring are realized. These initial results pave the way toward a category of optical collaborative devices ranging from human-machine interfaces to multifunctional on-skin healthcare sensors.
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