Development of AE monitoring system for detection of termite attack in wooden house at early stage

研制了一种新的声发射监测系统，用于早期检测木结构房屋的白蚁危害。该系统包括一个便携式AE检测仪。一个敏感的AE传感器，接口单元连接检测器和互联网和软件系统控制和数据记录和分析。1999年研制的声发射探测器具有放大、滤波、甄别、计数等功能。以下设备涉及：探测器与现场CPU之间的接口（称为事件适配器）、现场CPU与中央控制CPU（或客户端CEU）之间的数据传输和控制设备以及通过局域网或Internet或电话进行数据管理的程序。研究了传感器的性能和基于Internet的数据传输系统。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。在研制过程中，利用常规声发射监测仪对木结构房屋进行了白蚁侵害监测，验证了声发射连续监测系统的可行性。收集了装置设计的基本信息。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，研究了相对湿度与白蚁危害的关系。此外，还对水泥稳定污泥（Polynite）颗粒层物理屏障进行了声发射监测，确认了颗粒间摩擦产生的声发射。对上述结果进行了全面检查，并发表了最终报告。

A new AE monitoring system for the detection of termite attack in wooden house at an early stage was developed. The system consists of a portable AE detector with.an sensitive AE sensor, interface unit connecting the detector and the Internet and the software to System control and data logging and analysis. The AE detector (which was developed in the research project in 1999 has the functions; amplification, filtering and discrimination, counter to count AE events. The following devices involve; the interface between the detector and on-site CPU (called event adapter), the date transferring and control devices and the program for data management between on-site CPU and central control CPU (or Client CEU) using LAN or Internet, or telephones. The performance of the sensor and the data transferring system using internet was investigated. The client can derive the data by accessing to the server by internet through PC or handy phones. The feasibility of the continuous AE monitoring system for the wooden houses was confirmed.In the developing process, termite attack in wooden houses were detected, by using conventional AE rionitoring apparatuses. The basic information for the design of the apparatus was collected. 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. In the laboratory tests, the relationships between the relative humidity and the termite infestation was investigated. AE monitoring in the physical barrier using particulates layer of crushed cement-stabilized sludge (Polynite) was also carried out, and it was confirmed, AE s were generated by the friction between the particulates.The above results were totally examined and the final reports was published.