为检测碳化硅颗粒增强铝基复合材料的均匀性,利用与厚度无关声反射板(TIRP,Thickness Independent Reflector Plate)法对材料声速进行成像,排除了材料厚度的影响,提高了检测精度.介绍了TIRP法的基本原理和试验系统的结构,提出了一种基于双次扫描方式的TIRP实时成像方法,进一步提高了精度.利用底面反射回波法、单次扫描TIRP法和双次扫描TIRP法进行了试验,并对成像结果进行了比较,能够看出基于双次扫描的TIRP法可获得更准确清晰的声速图像.最后对误差来源进行了分析,指出了改进的方向. In order to detect the uniformity of silicon carbide particle reinforced aluminum matrix composites, TIRP (Thickness Independent Reflector Plate) method was used to image the velocity of sound, which eliminated the effect of material thickness and improved the detection accuracy. TIRP method and the structure of the experimental system, a real-time TIRP imaging method based on double scanning method is proposed to improve the accuracy further.Using bottom reflection echo method, single-scan TIRP method and double-scanning TIRP method After comparing the imaging results, we can see that the TIRP method based on double scanning can obtain a more accurate and clear sound velocity image.Finally, the source of error is analyzed and the direction of improvement is pointed out.