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感应电涡流在非接触位移、振动测量中，采用Ｌ值测试法和调频线路具有仪器灵敏度高且灵敏度不随温度变化、原始间隙直接显示、对于不同被测材料不需重新定标等优点。并对电涡流的基本原理和常用的三种测试法作了简单地述评。
Induction eddy current in non-contact displacement, vibration measurement, the use of L value test method and the FM line with high sensitivity and sensitivity does not change with temperature, the original gap directly displayed for different materials without the need to re-calibration and other advantages. The basic principles of eddy current and the three commonly used test method made a brief comment.