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Non-destructive detection of insect attack in historically important wooden constructions.

对历史上重要的木结构建筑中的昆虫攻击进行无损检测。

基本信息

批准号：
11680162
负责人：
FUJII Yoshihisa
金额：
$ 1.41万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11680162/
关键词：
AE historical wooden constructions termite attack non-destructive evaluation insect attack

项目摘要

A case study on the non-destructive detection of termite attack using AE monitoring was carried out, by using a traditional Japanese farmer's house in Wakayama Prefecture and common family wooden houses. A portable AE sensor made of PVDF film was developed, which is specially designed for the wooden construction members of the houses. The performance of the sensor and the data transferring system using internet was investigated. The system consists of AE sensor, detector for amplification, filtering and discrimination, counter to count AE events (which was already developed in the research project in 1999), interface between the detector and on-site CPU (called event adapter), and the date transferring and control program for data management between on-site CPU and central control CPU (or Client CPU) using LAN or Internet, or telephones. The feasibility of the continuous AE monitoring system for the historically important wooden constructions, like shrines and temples, was investigated. The client can derive the data by accessing to the server by internet through PC or handy phones.Nine historically important wooden constructions were investigated. In the survey, the termite attack and other biological deterioration was inspected by visual inspections. At the same time, non-destructive detection of termite attack using AE monitoring was also carried out. The active termite attack was detected by AE monitoring. However some practical and technical problems were also found, whne the AE monitoring was applied.In the laboratory tests, the relationships between the relative humidity and the termite infestation was investigated.The above results were totally examined and the final reports was published.

以和歌山县的传统农家住宅和普通家庭木屋为研究对象，对利用声发射监测进行白蚁侵害的无损检测进行了案例研究。研制了一种适用于房屋木质结构构件的PVDF薄膜便携式声发射传感器。研究了传感器的性能和基于Internet的数据传输系统。该系统由声发射传感器、放大、滤波和甄别探测器、声发射事件计数器（1999年课题组已研制完成）、探测器与现场CPU的接口（称为事件适配器）、现场CPU与中央控制CPU（或客户端CPU）之间通过局域网、Internet或电话进行数据传输和数据管理的控制程序组成。研究了对具有重要历史意义的木结构建筑物（如神社和寺庙）进行连续声发射监测的可行性。客户端可以通过PC或手持电话通过互联网访问服务器获取数据。在调查中，白蚁攻击和其他生物恶化是通过目视检查。同时，还利用声发射监测对白蚁侵害进行了无损检测。通过声发射监测发现了白蚁的主动攻击。在室内试验中，对室内相对湿度与白蚁危害的关系进行了研究，对上述结果进行了全面的检验，并发表了最终报告。