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An Ultra-Sensitive Multi-Functional Optical Micro/Nanofiber Based on Stretchable Encapsulation
Siheng Xiang1, Hui You1, Xinxiang Miao1
1Department of Engineering Optics, Research Center of Laser Fusion CAEP, Mianyang 621900, China.
Sensors (Basel, Switzerland)
|November 27, 2021
Summary
This study presents a new stretchable optical fiber sensor (SOFS) for wearable health monitoring. The ultra-sensitive SOFS accurately detects strain, temperature, and humidity for real-time physiological measurements.
Area of Science:
- Optoelectronics
- Biomedical Engineering
- Materials Science
Background:
- Stretchable optical fiber sensors (SOFSs) are emerging as key components in advanced sensing applications.
- Existing SOFSs show promise but require further development for multi-functional wearable health monitoring.
Purpose of the Study:
- To develop an ultra-sensitive, multi-functional SOFS integrated with a flexible polydimethylsiloxane (PDMS) membrane.
- To evaluate the sensor's performance for real-time monitoring of physiological parameters.
Main Methods:
- Fabrication of an optical micro/nanofiber embedded with a flexible PDMS membrane.
- Characterization of the sensor's response to strain, temperature, and humidity using evanescent field effects.
Main Results:
- Achieved ultra-high strain sensitivity with a peak gauge factor of 450.
- Demonstrated accurate temperature sensing (30–60 °C) with a 0.02 dBm/°C response.
- Showcased wide-range humidity detection with a peak sensitivity of 0.5 dB/% RH.
Conclusions:
- The developed SOFS exhibits robust sensing capabilities and flexibility, suitable for wearable applications.
- The sensor enables real-time monitoring of pulse, body temperature, and respiration.
- This SOFS holds significant potential for practical wearable healthcare sensor applications.
