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Research and development of ultrasonic time-of-flight CT system for inspection of buildings with cultural values

具有文化价值的建筑物检查用超声波飞行时间CT系统的研发

基本信息

批准号：
13558009
负责人：
ADACHI Kazunari
金额：
$ 9.28万
依托单位：
Yamagata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13558009/
关键词：
Ultrasonic time-of-flight CT Inspection of buildings with cultural values Trial-made prototype Sanbutsu-do Hall of Rinnoh-ji Temple Three-Story Pagoda of Rinnoh-ji Temple Tokikunis'residence Main Building of Yonezawwwa Technical College Root

项目摘要

Since the main purpose f the research of this category is to develop and manufacture a prototype of the apparatus, the number of the research papers published in the period is not large. However, the multi-probe ultrasonic time-of-flight computed tomography system, which can be used for practical structural inspection of buildings with cultural values, has been produced on the basis of the knowledge that the investigators involved acquired in laboratory works on small high-power broadband transducers and many field works. The system has eighteen ultrasonic probes which can emit high-intensity ultrasonic pulse signals into the object to be inspected and collect the TOF data for many sound propagation paths in short time. In the early-stage type of ultrasonic TOF CT system the investigators had developed only a pair of ultrasonic probes had been manually handed to collect the TOF data and thus it had taken longtime to accomplish the measurement.Some devices to fix the probes securely on … More the surface of the object to be inspected have also been developed for the system. When the cross section of the object is circular. we can use the combination of the wire cables and the probe-holders specially designed for this purpose. For a rectangular cross section that. of the guide rails and the holders can be used. Each probe holder has screw bolts and springs to adjust the force imposed on the probe to press it against the surface of the object. The investigator also made container of all the items of the TOF CT system to impove its portability for field works. In addition the investigator have developed a power supply unit for providing electric power to all probes.On the other hand the investigator have conducted many field works to test and demonstrate the performance of the system being developed. The cross sections of some pillars of the Three-Story Pagoda and Sanbutsu-do Hall of Rinnohji Temple in Nikko were visualized in September 2002 and the structural members of Tokikunis' residence in Wajima City in Ishikawa Prefecture were inspected July 2003. Also the condition of a pillar of the grand staircase in the Main Building of Yonezawa Technical College was investigated. In those cases, the system successfully provided some importantt information for restoration works, such as root replacement of pillars of the buildings designated as National Important Cultural Assets. Less

由于这类研究的主要目的是开发和制造仪器的原型，因此这一时期发表的研究论文数量并不多。然而，多探头超声飞行时间计算机断层扫描系统，它可以用于实际的结构检查的建筑物的文化价值，已经产生的知识的基础上，参与调查人员在实验室工作中获得的小型高功率宽带传感器和许多实地工作。该系统由18个超声探头组成，可以向被测物体发射高强度的超声脉冲信号，在短时间内采集多条声传播路径的飞行时间数据。在早期的超声TOF CT系统中，研究者们只开发了一对超声探头，手动采集TOF数据，因此需要很长时间才能完成测量。 ...更多信息也为该系统开发了待检查物体的表面。当物体的横截面是圆形时。我们可以使用专门为此目的设计的线缆和探针保持器的组合。对于矩形横截面。可以使用导轨和保持器的组合。每个探头保持器具有螺栓和弹簧，以调节施加在探头上的力，从而将探头压靠在物体的表面上。研究者还将TOF CT系统的所有物品制成集装箱，以提高其现场工作的便携性。此外，研究人员还开发了一个为所有探头提供电力的电源装置，另一方面，研究人员进行了许多实地工作，以测试和演示正在开发的系统的性能。2002年9月对尼科麟之路寺的三层塔和三佛堂的部分支柱进行了可视化，并于2003年7月对石川县轮岛市时国家住宅的结构构件进行了检查。此外，米泽技术大学主楼的大楼梯的支柱的条件进行了调查。在这些案例中，该系统成功地为修复工程提供了一些重要信息，例如被指定为国家重要文化遗产的建筑物的支柱的根部更换。少