在复层厚度无损测量技术中,电磁方法由于其适用范围广(能用于磁性和非磁性金属上的各种金属镀层、非金属复层,以及各种非金属材料上的金属镀层等),仪器结构简单,成本低,使用维护方便等,所以获得广泛的应用。本文将概述用电磁感应和涡流无损方法测量复层厚度的原理,并以本所近年研制的几种测厚仪为例,着重介绍各种电磁测厚仪的电路、性能以及仪器调试过程中的一些技术问题。 In the non-destructive measurement of multilayer thickness, due to its wide range of application, the electromagnetic method can be used for various metal coatings on magnetic and non-magnetic metals, non-metal coatings, and metal coatings on various non-metal materials, etc.) Instrument structure is simple, low cost, easy to use maintenance, so access to a wide range of applications. This article will outline the principles of electromagnetic measurement and eddy current non-destructive method to measure the thickness of the cladding layer. Taking several kinds of thickness gauges developed in recent years as an example, this paper focuses on the circuit, performance and debugging of the instrument Some technical problems