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增益比技术是一种提取涡流有用检测信号的特殊技术，该技术通过改变涡流信号垂直分量（Y）与水平分量（X）间的比值，提高涡流检测信号的信噪比，增强涡流仪器的检测性能。
The gain ratio technique is a special technique for extracting useful detection signals of eddy currents. This technique improves the signal-to-noise ratio of the eddy current detection signals and enhances the detection of eddy current devices by changing the ratio between the vertical component (Y) and the horizontal component (X) performance.