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Design Example: Measuring Distance Between Two Points with Obstructions01:10

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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
10:39

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Published on: October 11, 2016

Area measurement at long-distance using a circular Dammann grating.

Fung Jacky Wen1, Zhongyu Chen, Po Sheun Chung

  • 1Department of Electronic Engineering, City University of Hong Kong, 83, Tat Chee Avenue, Kowloon Tong, Hong Kong, China.

Applied Optics
|February 2, 2010
PubMed
Summary

This study introduces a novel noncontact method for measuring object area at long distances using a circular Dammann grating (CDG). The technique accurately determines area by measuring the CDG

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Area of Science:

  • Optics and Photonics
  • Metrology
  • Noncontact Measurement Techniques

Background:

  • Traditional area measurement methods can be complex, requiring extensive image data or pattern recognition.
  • Accurate long-distance measurement of object dimensions presents significant challenges in various industrial and scientific applications.

Purpose of the Study:

  • To develop a novel, noncontact method for accurate long-distance area measurement.
  • To utilize the optical properties of a circular Dammann grating (CDG) for simplified area determination.

Main Methods:

  • Employed a circular Dammann grating (CDG) to generate a circular spectrum.
  • Measured the diameter of the circular spectrum using simple lens formulas.
  • Investigated the linear relationship between spectrum diameter and distance via fractional Fourier transform.

Main Results:

  • Achieved noncontact area measurement at a distance of 11.25 m with accuracy better than 3%.
  • Demonstrated a linear relationship between the spectrum diameter and the distance of the CDG.
  • The method requires minimal image data and no pattern recognition.

Conclusions:

  • The developed CDG-based method offers a simple, accurate, and cost-effective solution for long-distance noncontact area measurement.
  • This technique presents advantages over conventional methods, including a compact design and high precision.
  • Experimental results validate the effectiveness and practicality of the proposed measurement system.