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Simultaneous displacement and angular drift measurement based on defocus grating.

Haotong Ma1, Fengjie Xi, Xiaolin Wang

  • 1College of Photon-Electron Science and Engineering, National University of Defense Technology, Changsha, Hunan 410073, China.

Applied Optics
|August 11, 2010
PubMed
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This study introduces a new method for simultaneously measuring displacement and angular drift using a defocus grating. This technique simplifies measurement by using a single system, achieving high accuracy.

Area of Science:

  • Optics and Photonics
  • Metrology
  • Precision Engineering

Background:

  • Simultaneous measurement of displacement and angular drift is crucial in various scientific and engineering fields.
  • Existing methods often require complex setups with multiple detection systems.
  • There is a need for a more streamlined and efficient technique for dual-axis metrology.

Purpose of the Study:

  • To propose and demonstrate a novel technique for simultaneous measurement of displacement and angular drift.
  • To investigate the relationship between incident beam drift and the movement of diffraction spots.
  • To offer a simplified alternative to existing multi-system approaches.

Main Methods:

  • Utilizing a defocus grating to generate +/-1 diffraction orders.

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  • Monitoring the positional shifts of these diffraction spots to infer beam movement.
  • Analyzing the correlation between incident beam deviations and observed spot displacements.

    • Main Results:

    • Demonstrated a technique for simultaneous displacement and angular drift measurement.
    • Achieved root-mean-square errors below 0.5 microm for displacement.
    • Achieved root-mean-square errors below 0.84 microrad for angular drift.

    Conclusions:

    • The defocus grating method provides an effective single-system solution for simultaneous displacement and angular drift measurement.
    • This technique offers improved simplicity and efficiency compared to traditional methods.
    • The demonstrated accuracy supports its potential application in precision metrology.