Development of "Dynamic Crack Microscope"

开发“动态裂纹显微镜”

基本信息

批准号：
01850025
负责人：
KISHI Teruo
金额：
$ 8.7万
依托单位：
Research Center for Advanced Science and Technology, University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B).
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01850025/
关键词：
Acoustic Emission AE source characterization Low noise & high sensitivity sensor Digital signal processor Parallel processing Pipe line processing High resolution location DSPパイプライン処理高速・大容量AE収録高感度・低雑音インテグレ-ティッドAE変換子 1〜3結合複合圧電体縦波専用

项目摘要

A high sensitivity and low noise integrated acoustic emission sensor has been successfully developed to detect microcrack. This sensor is designed by both the piezoelectric element vibration mode and the electric circuit of first stage amplifier which minimizes by eliminating the signal loss and noise. This sensor is sold from the cooperative company of this project.AE data acquisition and analysis system have been also successfully developed. The high speed data acquisition system consists of the analog to digital converter (8bit/20MHz/6ch), the multi processing digital signal processors of each AE channel, the pipe line signal processing using digital signal processor for AE source location and the host personal computer (80386SX/80387SX) to display and analyze data. The system capability is as follows : the data acquisition speed with 6ch is 70 events/sec, the maximum number of storage events are 7000, the resolution of source location is a few hundred micron meter, the calculation time of source characterization is less than one second each event. This system will be on sale from the cooperative company as "Dynamic Crack Microscope".Preliminary AE tests were carried out for ceramic materials and this Dynamic Crack Microscope has demonstrated great potential for the investigation of fracture mode of each micro crack and fracture mechanism in the fiber reinforced composite materials.

已经成功开发出高灵敏度和低噪声整合声发射传感器来检测微裂纹。该传感器是由压电元件振动模式和第一阶段放大器的电路设计的，通过消除信号损耗和噪声来最小化。该传感器是从该项目的合作社出售的。AAE数据采集和分析系统也已成功开发。高速数据采集系统由数字转换器（8bit/20mHz/6CH），每个AE通道的多处理数字信号处理器，使用数字信号处理器的管线信号处理和主机个人计算机（80386SX/80387SX）使用数字信号处理器的多个处理数字信号处理器组成。系统功能如下：6CH的数据采集速度为70个事件/秒，存储事件的最大数量为7000，源位置的分辨率为几百微米米，源表征的计算时间小于每个事件。该系统将从合作社公司出售，因为“动态裂纹显微镜”。用于陶瓷材料的初步AE测试，这种动态裂纹显微镜表明，在纤维增强复合材料中每种微裂纹和裂缝机制的裂缝模式的研究表现出巨大的潜力。