Statistical properties of ultrasound speckles reflected from an interface

• 来源期刊: 声学学报（英文版）
• 学科: 物理学
• 年，卷（期）: 2003,（2）
• 页码范围: 103-112
• 页数: 10页
• 分类号: O42
• 语种: 英文

摘要

The first- and second-order statistical properties of ultrasound speckles reflectedfrom an interface are studied theoretically and experimentally. A theoretical model for predict-ing statistical properties of ultrasound speckles is constructed based on the Fresnel-Huygensprinciple and three basic assumptions. Distributions of amplitude and phase of ultrasoundspeckles in a scattering space are studied. And the study shows that they are in the form ofRayleigh and uniform distribution respectively. Using the proposed model, the average trans-verse size of the speckles within a scattering domain which are received by a focus probe isinvestigated. The average transverse size is found to be dependent on the characteristics ofthe measuring system only, and does not vary with the position in the domain. To verify theapplicability of the theoretical model, a special experimental set-up was designed and the cor-responding experiments were conducted for measuring the sound pressure of the ultrasoundspeckles reflected from an interface between water and Aluminium alloy. The numerical resultsare compared with the experimental ones. The comparison demonstrates that the theoreti-cal model and the three related assumptions are suitable for analysing statistical properties ofultrasound speckles reflected from an interface.