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Dispersion Turning Attenuation Microfiber for Flowrate Sensing.

Yaqi Tang1, Chao Wang1, Xuefeng Wang2

  • 1Julong College, Shenzhen Technology University, Shenzhen 518118, China.

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|August 26, 2023
PubMed
Summary
This summary is machine-generated.

We developed a novel optical fiber modal interferometer (MI) using high attenuation fiber (HAF) for airflow sensing. This integrated sensor acts as both interferometer and heat source, achieving high sensitivity for microfluidic applications.

Keywords:
anemometerdispersion turning pointhigh attenuation fiberoptical fiber sensor

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Area of Science:

  • Optics and Photonics
  • Fiber Optics
  • Sensor Technology

Background:

  • Traditional airflow sensors face limitations in microfluidic environments.
  • Integrating sensing and heating functions in a single device is challenging.

Purpose of the Study:

  • To demonstrate a novel optical fiber modal interferometer (MI) for airflow sensing.
  • To leverage a high attenuation fiber (HAF) for integrated heating and sensing capabilities.
  • To achieve high sensitivity airflow measurement in compact spaces.

Main Methods:

  • Fabrication of an MI using arc-discharge and flame tapering on a HAF.
  • Reduction of fiber diameter to approximately 2 μm to observe the dispersion turning point (DTP).
  • Utilizing a pump laser to induce temperature increase in the HAF via absorption.

Main Results:

  • The developed sensor exhibited high air-flow sensitivity of -2.69 nm/(m/s) at 1.0 m/s.
  • The DTP in the transmission spectrum showed high sensitivity to ambient temperature changes.
  • The integrated heat source and thermosensitive nature enabled effective airflow detection.

Conclusions:

  • The proposed HAF-based MI is a promising platform for compact and highly sensitive airflow sensing.
  • The sensor demonstrates potential for low flowrate measurements in microfluidic channels.
  • Further improvements in sensitivity are achievable through optimizing sensor design and pump power.