前言超声检测技术,在工业中得到日益广泛的应用。在实际被检的工件或试件中,无论是金属材料还是非金属材料,都存在材质本身的衰减问题,因此如何测定材质衰减系数,有时就成为非常必要的了。材质衰减系数,不仅在厚工件或材质衰减大的材料超声探伤中起着不可忽视的作用,而且,还可作为评价材料之用,并且开始深入到断裂力学 Foreword Ultrasonic testing technology, in the industry has been increasingly widely used. In the actual inspection of the workpiece or specimen, whether it is metal or non-metallic materials, there is the problem of attenuation of the material itself, so how to measure the material attenuation coefficient, and sometimes become very necessary. The material attenuation coefficient plays an important role not only in the ultrasonic flaw detection of thick workpieces or materials with large attenuation, but also can be used as a material for evaluation and begin to go deep into the field of fracture mechanics