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Article

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

1
Department of Electrical Engineering, Harbin Institute of Technology, Harbin 150001, China
2
State Grid Liaoning Electric Power Research Institute, Shenyang 110006, China
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(13), 2997; https://doi.org/10.3390/s19132997
Received: 31 May 2019 / Revised: 27 June 2019 / Accepted: 5 July 2019 / Published: 7 July 2019
When applying an optical current transformer (OCT) to direct current measurement, output signals exhibit a low signal-to-noise ratio and signal-to-noise band overlap. Sinusoidal wave modulation is used to solve this problem. A double correlation detection algorithm is used to extract the direct current (DC) signal, remove white noise and improve the signal-to-noise ratio. Our sensing unit uses a terbium gallium garnet crystal in order to increase the output signal-to-noise ratio and measurement sensitivity. Measurement errors of single correlation and double correlation detection algorithms are compared, and experimental results showed that this measurement method can control measurement error to about 0.3%, thus verifying its feasibility. View Full-Text
Keywords: DC measurement; OCT; TGG crystal; signal processing; double correlation detection DC measurement; OCT; TGG crystal; signal processing; double correlation detection
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MDPI and ACS Style

Shen, Y.; Chen, T.; Yu, W.-b.; Ge, J.-m.; Han, Y.; Duan, F.-w. A Direct Current Measurement Method Based on Terbium Gallium Garnet Crystal and a Double Correlation Detection Algorithm. Sensors 2019, 19, 2997. https://doi.org/10.3390/s19132997

AMA Style

Shen Y, Chen T, Yu W-b, Ge J-m, Han Y, Duan F-w. A Direct Current Measurement Method Based on Terbium Gallium Garnet Crystal and a Double Correlation Detection Algorithm. Sensors. 2019; 19(13):2997. https://doi.org/10.3390/s19132997

Chicago/Turabian Style

Shen, Yan, Tong Chen, Wen-bin Yu, Jin-ming Ge, Yue Han, and Fang-wei Duan. 2019. "A Direct Current Measurement Method Based on Terbium Gallium Garnet Crystal and a Double Correlation Detection Algorithm" Sensors 19, no. 13: 2997. https://doi.org/10.3390/s19132997

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