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根据焦散线的形成原理，以及含Ⅰ型裂纹试件受力前后光程差与声程差表达式的相似性，提出了声焦散线的概念，得到了声焦散线沿横向最大尺寸与应力强度因子的关系，为通过声焦散线法确定应力强度因子打下了基础．
According to the formation principle of caustics, and the similarities between the optical path difference and the path length difference before and after the specimen containing type Ⅰ, the concept of acoustic caustics is proposed. The maximum caustic caustics length along transverse direction The relationship with stress intensity factor provides the basis for the determination of stress intensity factor by acousto-optic method.