一、前言镀层的厚度直接与其物质特性和机械性能有关,例如外观和刚性。因此,在许多工业应用中,测量镀层的厚度是十分重要的。今天,从市场上可以买到许多种测量镀层厚度的仪器,这些仪器依靠电离辐射的传播、电容器的电容变化、磁路的磁阻变化,或者涡流的衰减等。而超声干涉测量法的优点是测量时间快, I. PREFACE The thickness of the coating is directly related to its physical and mechanical properties, such as appearance and rigidity. Therefore, in many industrial applications, measuring the thickness of the coating is very important. Today, there are many instruments available on the market for measuring coating thickness. These instruments rely on the propagation of ionizing radiation, changes in capacitor capacitance, changes in the reluctance of the magnetic circuit, or eddy current decay. The advantage of ultrasonic interferometry is the measurement time,