Acoustic image technology of the inside inspection of concrete structure devoid of substance and pouring concrete into formwork

由于老化老化导致的港口码头坍塌或顶面塌方事故已被大量报道。为此，开发了对码头内部进行诊断的参数声纳系统。为了提高参数声纳和功率放大器、发射接收控制系统的二次波产生效率，采用压电复合材料制造方法设计了新型换能器。针对海底剖面仪参数化声纳SES2000，设计并制作了能对其进行近距离聚焦的菲涅耳透镜。我们为SES2000配备了镜头，用一个码头和一个水箱对其进行了评估，并对其进行了检查，获得了良好的测量结果。开发了用声摄像机精确测量码头表面形状的新技术。

A lot of accident examples that the collapse of the harbor quay or top surfacecave-in brought about have been reported by aged deterioration.Therefore, the parametric sonar system which diagnosed the quay inside has been developed. We designed the new transducer by the piezocomposite manufacturing method to improve the secondary wave generation efficiency of the parametric sonar and power amp, the transmission and reception control system. For parametric sonar SES2000 of sub-bottom profiler, the Fresnel lens which could focus it in a short distance was designed and produced. We equipped SES2000 with the lens and evaluated it with a quay and a water tank and examined it and got a good measurement result. New technique to measure a shape of the quay surface with an acoustic video camera precisely was developed also.