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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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High precision roughness sensor based on annular core optical fiber.

Zhiqiang Quan1, Libo Yuan1

  • 1Photonics Research Center, School of Electronic Engineering and Automation, Guilin University of Electronic Technology, Guilin 541004, China.

The Review of Scientific Instruments
|July 3, 2020
PubMed
Summary
This summary is machine-generated.

We developed a new fiber roughness sensor using annular core optical fiber (ACF) for precise, non-destructive surface measurements. This sensor achieves high spatial resolution and accuracy, making it ideal for nanoscale surface analysis.

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Area of Science:

  • Optical Engineering
  • Metrology
  • Materials Science

Background:

  • Surface roughness is a critical parameter in many industries.
  • Existing roughness measurement techniques have limitations in precision and spatial resolution.
  • Optical methods offer non-contact measurement capabilities.

Purpose of the Study:

  • To develop a high-precision fiber roughness sensor.
  • To leverage annular core optical fiber (ACF) technology for improved performance.
  • To enable non-destructive, nanoscale surface roughness measurements.

Main Methods:

  • Utilizing an annular core optical fiber (ACF) with a cone-frustum-shaped tip.
  • Generating a focused ring light for surface interrogation.
  • Integrating incident and collecting optical paths within the ACF.
  • Employing specular light collection for roughness detection.

Main Results:

  • Achieved high spatial resolution of 6 µm.
  • Demonstrated measurement accuracy with an error of approximately 5% for 10-nanoscale roughness.
  • Reduced diffuse light coupling into the sensor via the cone-frustum tip.
  • Integrated incident and collecting optical paths for efficient roughness detection.

Conclusions:

  • The developed ACF-based sensor offers high precision and spatial resolution for surface roughness measurement.
  • The sensor design minimizes diffuse light interference, enhancing measurement accuracy.
  • This technology is suitable for a wide range of high-precision, non-destructive surface roughness applications.