研究目的
To study the temperature dependence of the Faraday rotation angle error and Verdet constant of garnet-type optical current sensors, including those with Ta/Nd2Fe14B/Ta groove films, to understand and reduce measurement errors under varying temperature and current conditions.
研究成果
The garnet-groove film OCS demonstrates significantly lower measurement errors (below 0.3%) in Faraday rotation angle across a wide range of temperatures and currents compared to the garnet-type OCS (up to 1.5% error). The Verdet constant variation is smaller for the garnet-groove film, contributing to reduced errors. This indicates that Ta/Nd2Fe14B/Ta films effectively mitigate temperature-induced errors, enhancing the reliability of optical current sensors for practical applications. Future work could explore broader temperature ranges and alternative materials for further optimization.
研究不足
The study is limited to a specific temperature range (25°C to 80°C) and current range (0 to 1000 A), which may not cover all operational conditions. The use of specific garnet types and film preparations might not generalize to other materials. The resolution and accuracy of equipment (e.g., polarimeters, current generator) impose constraints on measurement precision. Thermal expansion effects are considered negligible but could have minor impacts at extreme temperatures.
1：Experimental Design and Method Selection:
The study uses the Faraday effect and Malus's Law to measure Faraday rotation angles and errors. A polarization-stepping technique is employed to evaluate the Verdet constant. The experimental setup includes optical components and high-current generation to simulate real-world conditions.
2：Sample Selection and Data Sources:
Samples include a garnet (GLB 1550 from Granopt Co., Ltd) and garnet-groove films prepared by magnetron sputtering with Ta/Nd2Fe14B/Ta layers. Data is collected at different temperatures (25°C to 80°C) and currents (0 to 1000 A).
3：List of Experimental Equipment and Materials:
Equipment includes a 1550 nm optical fiber laser, Thorlabs PAX 5710 IR3 polarimeters, a high current generator (SLQ-82), a Gauss meter (HT20), a heating system for temperature control, polarizers, analyzers, and the garnet samples. Materials include Ta, Nd2Fe14B, and garnet substrates.
4：Experimental Procedures and Operational Workflow:
The laser beam passes through a polarizer, the sample, an analyzer, and into the polarimeter. The angle between polarizer and analyzer is set to 45° for Faraday rotation measurements and to 0, π/4, π/2 for Verdet constant measurements. Current and temperature are varied systematically, and optical power is recorded at high sampling rates.
5：Data Analysis Methods:
Data is analyzed using equations for Faraday rotation angle, measurement error, and Verdet constant. Statistical methods are implied for error calculation, with software tools not specified but likely involving basic data processing for averages and ratios.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
