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Glassware Calibration01:11

Glassware Calibration

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Accurate calibration of glassware, such as volumetric flasks, pipettes, and burettes, is essential to ensure accurate measurements in the analytical laboratory. Calibration helps maintain consistency across measurements and prevents errors arising from inaccurate volumes.
Volumetric flasks: Volumetric flasks are designed to prepare aqueous solutions of precise volumes accurately with a calibration line on the neck. To calibrate a volumetric flask, it is important to fill it with distilled...
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Phase Target-Based Calibration of Projector Radial Chromatic Aberration for Color Fringe 3D Measurement Systems.

Yuzhuo Zhang1, Yaqin Sun1, Nan Gao1

  • 1Intelligent Photoelectric Multi-Dimensional Sensing Laboratory, Hebei University of Technology, Tianjin 300400, China.

Sensors (Basel, Switzerland)
|September 23, 2022
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Summary

This study introduces a novel method to measure and correct projector radial chromatic aberration in 3D measurement systems. The technique significantly reduces chromatic aberration, enhancing projection quality and 3D measurement accuracy.

Keywords:
3D measurementchromatic aberration correctionchromatic aberration of projector

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Area of Science:

  • Optics and Photonics
  • 3D Metrology
  • Image Processing

Background:

  • Chromatic aberration in projectors impacts 3D measurement accuracy.
  • Existing methods for projector chromatic aberration are complex and require further investigation.
  • Camera calibration is widely studied, but projector aberration remains a challenge.

Purpose of the Study:

  • To propose a novel, simplified method for measuring and correcting projector radial chromatic aberration.
  • To improve the accuracy and quality of color fringe projection 3D profile measurement.
  • To address the limitations of traditional projector chromatic aberration calibration methods.

Main Methods:

  • A phase target using a liquid crystal display with holographic film was developed.
  • Sinusoidal fringe patterns (red, green, blue) were projected and their phases analyzed.
  • A phase coordinate system, using the green channel as reference, was established for calibration.
  • Red and blue channel chromatic aberrations were calculated and pre-compensated.

Main Results:

  • The method effectively measures and calibrates projector radial chromatic aberration, independent of camera image quality.
  • Maximum red-green channel chromatic aberration reduced from 1.9591/pixel to 0.5759/pixel.
  • Maximum blue-green channel chromatic aberration reduced from 1.8906/pixel to 0.5938/pixel.

Conclusions:

  • The proposed method offers a practical solution for projector chromatic aberration correction.
  • Significant improvements in chromatic aberration reduction enhance 3D measurement system performance.
  • This technique is vital for advancing color fringe projection 3D profile measurement technology.