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A Wearable Breath Sensor Based on Fiber-Tip Microcantilever.

Cong Zhao1,2, Dan Liu1,2, Zhihao Cai1,2

  • 1Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.

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|March 24, 2022
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Summary
This summary is machine-generated.

This study introduces an all-fiber-optic wearable breath sensor immune to electromagnetic interference. The novel sensor accurately monitors respiration rate, even in challenging environments like MRI scans.

Keywords:
Fabry–Pérot interferometerbreath sensorfiber sensormicro-cantilevertwo-photon polymerizationwearable device

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Area of Science:

  • Biomedical Engineering
  • Optical Sensing
  • Wearable Technology

Background:

  • Respiration rate is a critical vital sign requiring monitoring in diverse conditions.
  • Electromagnetic interference, such as from MRI systems, poses challenges for conventional sensors.
  • There is a need for electromagnetically-immune breath-sensing solutions.

Purpose of the Study:

  • To develop an all-fiber-optic wearable breath sensor.
  • To ensure electromagnetic immunity for respiration monitoring.
  • To demonstrate reliable breath pattern detection.

Main Methods:

  • Fabrication of a fiber-tip microcantilever using two-photon polymerization.
  • Integration of the microcantilever into a micro Fabry-Pérot (FP) interferometer.
  • Detection of reflected light power variations to determine breath rate.

Main Results:

  • Achieved high sensitivity of 0.8 nm/(m/s) for airflow detection.
  • Demonstrated excellent thermal stability with low cross-sensitivity (0.095 (m/s)/°C).
  • Successfully detected various breath patterns (normal, fast, random, deep) in a wearable mask.

Conclusions:

  • The proposed fiber-optic breath sensor is electromagnetically immune.
  • The sensor offers a reliable method for respiration rate monitoring in challenging environments.
  • This technology has potential applications in medical monitoring, including within MRI settings.