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Updated: Nov 18, 2025

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Vibration Sensor Based on Hollow Biconical Fiber.

Yingfang Zhang1, Ben Xu2, Dongning Wang2

  • 1Faculty of Information Technology, Macau University of Science and Technology, Avenida Wai Long, Taipa, Macau, China.

Sensors (Basel, Switzerland)
|February 6, 2021
PubMed
Summary

A novel hollow biconical fiber sensor accurately detects vibrations and sound intensity. This compact, lightweight sensor offers high sensitivity and reliable performance, showing great potential for engineering applications.

Keywords:
hollow biconical fiberinterferometeroptical fiber sensortemperaturevibration

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Area of Science:

  • Photonics
  • Fiber Optics
  • Sensor Technology

Background:

  • Vibration sensing is crucial in many engineering fields.
  • Existing sensors often face limitations in sensitivity, size, or environmental robustness.

Purpose of the Study:

  • To propose and demonstrate a novel hollow biconical fiber sensor for vibration detection.
  • To evaluate the sensor's sensitivity, accuracy, and reliability.

Main Methods:

  • Fabrication of a hollow biconical fiber by creating an air micro-cavity in single-mode fiber and subsequent tapering.
  • Experimental testing for bending sensitivity, acoustic vibration detection, and demodulation.
  • Validation using cantilever beam testing.

Main Results:

  • High bending sensitivity of 21.30 dB/m-1.
  • Accurate demodulation of vibration frequency and distinction of sound intensity with a maximum signal-to-noise ratio (SNR) of 59 dB.
  • Demonstrated reliability and temperature insensitivity.

Conclusions:

  • The hollow biconical fiber sensor offers a lightweight, compact, and highly sensitive solution for vibration sensing.
  • The sensor shows significant potential for practical applications in various engineering fields.