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A Direct Current Measurement Method Based on Terbium Gallium Garnet Crystal and a Double Correlation Detection

Yan Shen1, Tong Chen2, Wen-Bin Yu2

  • 1Department of Electrical Engineering, Harbin Institute of Technology, Harbin 150001, China. yanshen@hit.edu.cn.

Sensors (Basel, Switzerland)
|July 10, 2019
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Summary

This study enhances direct current (DC) measurement using an optical current transformer (OCT) with sinusoidal modulation and a double correlation algorithm. The method improves signal-to-noise ratio and achieves a low 0.3% measurement error.

Keywords:
DC measurementOCTTGG crystaldouble correlation detectionsignal processing

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Area of Science:

  • Physics
  • Electrical Engineering
  • Optical Sensing

Background:

  • Direct current (DC) measurement using optical current transformers (OCTs) often suffers from low signal-to-noise ratio (SNR) and signal-to-noise band overlap.
  • Existing methods struggle to accurately extract DC signals in the presence of noise.

Purpose of the Study:

  • To develop an improved method for DC measurement using OCTs.
  • To enhance the signal-to-noise ratio and reduce measurement errors in OCT systems.

Main Methods:

  • Utilized sinusoidal wave modulation to address low SNR issues.
  • Implemented a double correlation detection algorithm for DC signal extraction and white noise removal.
  • Employed a terbium gallium garnet crystal in the sensing unit to boost output SNR and measurement sensitivity.

Main Results:

  • The double correlation detection algorithm effectively improved the signal-to-noise ratio.
  • Comparison with single correlation detection showed reduced measurement errors.
  • Experimental validation demonstrated a measurement error of approximately 0.3%.

Conclusions:

  • The proposed method, combining sinusoidal modulation, double correlation detection, and a terbium gallium garnet crystal, is a feasible and effective approach for accurate DC measurement with OCTs.
  • This technique significantly enhances SNR and minimizes measurement errors, offering a practical solution for demanding applications.