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Related Experiment Video

Updated: May 7, 2026

Experimental Procedure for Warm Spinning of Cast Aluminum Components
07:36

Experimental Procedure for Warm Spinning of Cast Aluminum Components

Published on: February 1, 2017

Note: Vignetting calibration and temperature correction for casting billets.

Zhi Xie1, Yuzhong Zhang, Zhenwei Hu

  • 1State Key Laboratory of Synthetical Automation for Process Industries, Northeastern University, Shenyang 110819, China.

The Review of Scientific Instruments
|October 5, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces a novel calibration method for vignetting correction in CCD pyrometers. The improved system accurately measures casting billet temperatures despite surface scale and emissivity variations.

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Area of Science:

  • * Materials Science and Engineering
  • * Optical Metrology
  • * Industrial Process Control

Background:

  • * Charge-Coupled Device (CCD) pyrometers are susceptible to vignetting, causing temperature measurement distortions.
  • * Surface contaminants like iron oxide scale and dust, along with varying emissivity, further compromise accurate temperature readings in industrial settings.
  • * Existing temperature measurement methods for casting billets lack robustness against these challenges.

Purpose of the Study:

  • * To develop and validate a robust hybrid temperature measurement system for casting billets.
  • * To address and mitigate temperature measurement errors caused by vignetting, surface scale, dust, and emissivity variations.
  • * To enhance the accuracy and reliability of non-contact temperature monitoring in continuous casting processes.

Main Methods:

  • * A vignetting coefficient calibration method was developed to correct CCD pyrometer data.
  • * A hybrid system combining a high-resolution array CCD camera and a single-spot colorimetric thermometer was implemented.
  • * The system was applied and tested in real-world continuous casting production lines.

Main Results:

  • * The proposed vignetting calibration method achieved an estimation error of 0.052.
  • * The hybrid system demonstrated a maximum temperature measurement fluctuation of only 5 °C.
  • * Successful application and verification were confirmed in multiple continuous casting production lines.

Conclusions:

  • * The developed vignetting calibration method effectively corrects distortions in CCD-based pyrometry.
  • * The hybrid temperature measurement system reliably eliminates influences of surface scale, dust, and emissivity.
  • * The system offers a significant advancement for accurate real-time temperature monitoring in steel continuous casting.