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Long-optical-path scanning mechanism for optical coherence tomography.

Tatsuo Shiina1, Yohei Moritani, Masafumi Ito

  • 1Faculty of Systems Engineering, Wakayama University, 930 Sakaedani, Wakayama-shi, Wakayama 640-8510, Japan. shiina@sys.wakayama-u.ac.jp

Applied Optics
|July 19, 2003
PubMed
Summary

A novel scanning mechanism uses rotating corner reflectors to precisely alter long optical paths. This innovation enhances optical coherence tomography systems with high accuracy for material analysis.

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Area of Science:

  • Optics and Photonics
  • Mechanical Engineering
  • Metrology

Background:

  • Accurate manipulation of long optical paths is crucial for advanced measurement techniques.
  • Existing methods may lack the required linearity or speed for dynamic applications.

Purpose of the Study:

  • To propose and validate a new scanning mechanism for dynamically changing long optical paths.
  • To demonstrate its utility within an optical coherence tomography system.

Main Methods:

  • A disk with equally arranged corner reflectors and an outer mirror form the core mechanism.
  • Rotation of the disk induces a near-linear change in the optical path length.
  • An optical coherence tomography system was employed for system validation.
  • Analysis and experimental evaluation assessed operating characteristics and accuracy.

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Main Results:

  • The mechanism achieves a near-linear optical path change exceeding 40 mm.
  • Deviation in optical path change was less than 1.52% at +/-10 degrees reflector rotation.
  • A high-speed lock-in amplifier facilitated fundamental measurements on glass samples.

Conclusions:

  • The proposed scanning mechanism offers a viable solution for dynamic optical path length adjustments.
  • The system demonstrates high accuracy and linearity, suitable for applications like optical coherence tomography.
  • Experimental validation confirms the mechanism's effectiveness for precise measurements.