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Multifunctional Flexible Humidity Sensor Systems Towards noncontact Wearable Electronics

Nano-Micro Letters 2022年第9期14卷 187-220页

作者： Yuyao Lu Geng Yang Yajing Shen Huayong Yang Kaichen Xu State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China Department of Biomedical Engineering City University of Hong KongHong KongPeople’s Republic of China

In the past decade,the global industry and research attentions on intelligent skin-like electronics have boosted their applications in diverse fields including human healthcare,Internet of Things,human–machine interfaces,artificial intelligence and soft robotics.Among them,flexible humidity sensors play a vital role in noncontact measurements relying on the unique property of rapid response to humidity change.This work presents an overview of recent advances in flexible humidity sensors using various active functional materials for contactless monitoring.Four categories of humidity sensors are highlighted based on resistive,capacitive,impedance-type and voltage-type working mechanisms.Furthermore,typical strategies including chemical doping,structural design and Joule heating are introduced to enhance the performance of humidity sensors.Drawing on the noncontact perception capability,human/plant healthcare management,human-machine interactions as well as integrated humidity sensor-based feedback systems are presented.The burgeoning innovations in this research field will benefit human society,especially during the COVID-19 epidemic,where cross-infection should be averted and contactless sensation is highly desired.

关键词： Flexible electronics Flexible humidity sensors noncontact detection Healthcare monitoring Human-machine interactions COVID-19 epidemic

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High-speed all-optic optical coherence tomography and photoacoustic microscopy dual-modal system for microcirculation evaluation

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Journal of Innovative Optical Health Sciences 2022年第4期15卷 97-107页

作者： Yang Lin Menghan Yu Yi Wang Ziyue Meng Ang Li Zhonghai He Qiaoyun Wang Jian Liu Yao Yu Yuqian Zhao Xin Zhu Zhenhe Ma School of Control Engineering Northeastern University at Qinhuangdao Qinhuangdao 066004 P.R.China Biomedical Engineering Lab The University of Aizu Aizu-WakamatsuFukushima 965-8580Japan

We propose a high-speed all-optic dual-modal system that integrates spectral domain optical coherence tomography and photoacoustic microscopy(PAM).A 3*3 coupler-based interfer-ometer is used to remotely detect the surface vibration caused by photoacoustic(PA)waves.Three outputs of the interferometer are acquired simultaneously with a multi-channel data ac-quisition card.One channel data with the highest PA signal detection sensitivity is selected for sensitivity compensation.Experiment on the phantom demonstrates that the proposed method can sucessfully compensate for the loss of intensity caused by sensitivity variation.The imaging speed of the PAM is improved compared to our previous system.The total time to image a sample with 256×256 pixels is~20s.Using the proposed system,the microvasculature in the mouse auricle is visualized and the blood flow state is accessed.

关键词： Photoacoustic microscopy optical coherence tomography angiography dual-modal imaging sensitivity compensation noncontact detection

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