Wearable ultrasensitive and rapid human physiological monitoring based on microfiber Sagnac interferometer

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外文摘要：High-sensitive and fast-responding flexible strain sensors are essential for the smart wearable devices that precisely and dynamically perceive the weak deformations induced by human physiological signals.Here,a flexible strain sensor via polydimethylsiloxane(PDMS)-encapsulated microfiber Sagnac interferometer was designed and prepared for monitoring the human pulse signals and sound vibrations.The sensor achieved a record-breaking sensitivity(gauge factor,GF=9977)and an extremely low detection limit(0.00025％)due to the strong polarization-dependent coupling effect in the microfiber coupler and the polarization-mixing effect in the Sagnac loop.The relative intensity demodulation method also enabled a fast response time of 10 μs.The wearable pulse measurements were implemented by attaching this flexible strain sensor directly to human skin at various locations and the waveform details were accurately captured.Taking advantage of the ultra-high sensitivity and fast response performance of the prepared sensor,the real-time dynamic acquisition of the underwater weak signal,such as the hydro-acoustic waves with a wide range of 20 Hz-16.86 kHz,has been demonstrated.These initial results pave the way for a new and innovative category of underwater wearable devices with rapid detection of human physiological signals and weak environmental vibrations.

外文关键词：

flexible strain sensormicrofiber Sagnac interferometerunderwater detection

作者：

Xin WANG、Hongyou ZHOU、Meihua CHEN、Yongcheng HE、Zhishen ZHANG、Jiulin GAN、Zhongmin YANG

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作者单位：

State Key Laboratory Luminescent Materials and Devices,Institute of Optical Communication Materials,Special Glass Fiber and Device Engineering Technology Research and Development Center of Guangdong Province,Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques,South China University of Technology,Guangzhou 510640,China

Guangdong-Hong Kong-Macao Joint Laboratory for Intelligent Micro-Nano Optoelectronic Technology,Foshan University,Foshan 528000,China

基金：

国家自然科学基金Local Innovative and Research Teams Project of Guangdong Pearl River Talents ProgramKey Research and Development Program of GuangzhouGuangdong Basic and Applied Basic Research FoundationGuangdong Basic and Applied Basic Research Foundation中央高校基本科研业务费专项Research Fund of Guangdong-Hong Kong-Macao Joint Laboratory for Intelligent Micro-Nano Optoelectronic Technology

项目编号：

620750642017BT01X1372020070200032021B15150200952021A15151109192022ZYGXZR0032020B1212030010

出版年：

2024

DOI：

10.1007/s11432-023-3870-1

中国科学:信息科学(英文版)

中国科学院

中国科学:信息科学(英文版)

CSTPCDEI

影响因子：0.715

ISSN：1674-733X

年,卷(期)：2024.67(3)

参考文献量36