Development of static and dynamic data-acquisition system for wireless sensors

• Main Authors: Chia-Wei Chang, 張家瑋
• Other Authors: 林宜清
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/59061137805663683876

碩士 === 國立中興大學 === 土木工程學系所 === 104 === The purpose of this research is to develop an efficient and high integration wireless distributed data-acquisition system by understanding the differences and the advantages between wireless distributed data-acquisition systems and traditional centralized data- acquisition systems. The developed wireless data-acquisition device can calibrate the data captured by sensors and then improve the measurement accuracy by the individual sensor parameter obtained by the calibration test. The wireless and modular data-acquisition node developed by ourselves can cost down in installation and maintenance of the outdoor monitoring systems. We can accurately measure the vibration frequency in objects by using the dynamic data-acquisition system of wireless strain gauge developed in this research, which can measure directly the strain as well as the vibration characteristic in a structure on the same time. The wireless node module is easy to install and does not need to wire, it can easily be installed on a moving or rotating object, this may improve the efficiency in structure health monitoring and in building construction monitoring. Through the experimental data and the theoretical calculation in this research, we can understand that the signal captured by a long wire may be unstable or even wrong due to wire impedance and electromagnetic interference. When we do not grasp the correct characteristic of the instruments, it might misjudge seriously. Finally, we hope to construct a comprehensive data integrated monitoring system that can be adjusted in different requirements on site, and that can integrate sensors of different signal output, different data formats, different manufacturers, and different type, through the wireless distributed data-acquisition system developed by ourselves in hardware, firmware, communication and software, we can promote the efficiency in engineering monitoring, and cost down the monitoring system through the increase in the system compatibility.