电涡流检测论文

所谓涡流就是应用“电磁学”基本理论作为导体检测的基础。涡流的产生源于电磁感应的现象。当将交流电施加到导体，磁场将在导体内和环绕导体的空间内产生磁场。涡流就是感应产生的电流，它在一个环路中流动。之所以叫做“涡流”，是因为它与液体或气体环绕障碍物在环路中流动的形式是一样的。如果将一个导体放入该变化的磁场中，涡流将在那个导体中产生，而涡流也会产生自己的磁场，该磁场随着交流电流上升而扩张，。因此当测量金属材料的一些性质发生变化时，将影响到涡流的强度和分布，从而我们就可以通过一起来检测涡流的变化情况，进而可以间接的知道金属性能（材质，电导率，硬度）是否发生了变化。也就是磁通量的变化。

In this paper, a static displacement for the measurement of vibration displacement measurement, rotating machinery monitoring shaft vibration measurement of the electric eddy current testing of high-precision displacement measurement method. Introduce a single-chip implementation of the method of eddy current ranging system, the system by the AT89C51 microcontroller, eddy current displacement sensor acquisition circuit, ADC0804A / D conversion circuit, liquid crystal display circuit 1602. Displacement signal from the eddy current sensor acquisition, by UA741 amplified by ADC0804 ADC is converted to digital, from single-chip microcomputer for the collection, in order to realize micro-displacement between two points of control. Displacement through the liquid crystal display. This system has easy-to-use, high accuracy location and display the results of the advantages of intuitive. Keywords: eddy current sensor; AT89C51 single-chip microcomputer; displacement measurement; 1602 LCD

Abstract A kind of applies to quiet displacement measurement , the high-accuracy electricity eddy detecting technology that the vibration shaking the displacement measurement , monitoring a rotation shaft in revolution machinery measures measures displacement method that the main body of a book has been submitted. System having introduced the electricity eddy distance measurement realizing that method with monolithic machine, system collects a circuit from the AT89C51 monolithic machine , electricity eddy sensor displacement , ADC0804A/D change-over circuit , 1602 liquid crystal display circuits are composed of. The displacement signal collects , enlarges after UA741 the queen from electricity eddy sensor, the modulus converter changes into figure amount from ADC0804 , carry out acquisition from monolithic machine , realize the tiny displacement under the control of among 2 o'clock thereby. Demonstrate displacement by LCD display. This system has merit such as easy operation , distance measurement accurate degree height and the perception demonstrating result. Keywords: Electricity eddy sensor; AT89C51 monolithic machine; Displacement is measured; 1602 liquid crystal

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