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Related Experiment Videos

Optical approach to angular displacement measurement based on attenuated total reflection.

Fan Chen1, Zhuangqi Cao, Qishun Shen

  • 1Guided-Wave Photoelectronics Laboratory, Department of Physics, Shanghai Jiao Tong University, Dongchuan Road 800, Shanghai 200240, China. chenfan@sjtu.edu.cn

Applied Optics
|September 16, 2005
PubMed
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This study presents an optical method for angular displacement measurement using attenuated total reflection. Intensity measurement offers higher sensitivity to angular displacement than angular interrogation, especially at small incident angles.

Area of Science:

  • Optics
  • Photonics
  • Materials Science

Background:

  • Angular displacement measurement (ADM) is crucial in various scientific and industrial applications.
  • Existing ADM techniques face limitations in sensitivity and precision.
  • Optical methods offer potential for enhanced measurement capabilities.

Purpose of the Study:

  • To present a novel optical approach for ADM using the attenuated total reflection (ATR) technique.
  • To theoretically analyze the sensitivity of ADM based on ATR.
  • To compare different interrogation schemes for optical ADM.

Main Methods:

  • Utilizing the attenuated total reflection (ATR) technique with a planar optical waveguide.
  • Scanning incident angles to obtain an m line.

Related Experiment Videos

  • Analyzing two specific schemes for ADM: angular interrogation and intensity measurement.
  • Performing theoretical calculations to determine measurement sensitivity.

    • Main Results:

    • A sharp shift in the m line is observed with minute variations in waveguide layer thickness.
    • Intensity measurement demonstrates higher sensitivity for ADM compared to angular interrogation.
    • Smaller incident angles yield greater sensitivity to angular displacement in the intensity measurement scheme.

    Conclusions:

    • The proposed optical ADM method based on ATR is highly sensitive to angular displacement.
    • Intensity measurement is a more efficient interrogation scheme for this optical ADM.
    • Optimizing incident angles can further enhance the sensitivity of optical ADM systems.