摘要
为适应FAST项目索网结构索单元应力测量的需求,设计并制作了一种以频率法测索力理论为基础的无线式索力传感器节点。首先阐明了FAST工程中使用无线式索力传感器的必要性和优势;其次给出了频率法测索力的理论依据;重点介绍了基于MMA7260加速度计芯片的无线式索力传感器节点的硬件及软件设计;最后对传感器进行了对照实验。实验结果表明:该无线式传感器能准确拾取钢索振动信号,索内应力与一阶振动频率的一致性较好,为FAST日后施工过程的索力测量积累了经验。
To meet the requirements for measuring the cable tensions of the FAST cable net, we develop a model of wireless cable tension sensor node based on the frequency method. We first discuss the necessity and advantages of applying wireless cable tension sensor for the FAST. We subsequently describe the theoretical bases of cable tension measurement with the frequency method. As the key part of the paper we list certain details of the hardware and software development of the wireless sensor node, which is based on the accelerometer chip MMA7260. Finally, we present results of comparative tests conducted for the FAST wireless cable tension sensor. The test results show that the vibration signals in a cable wire can be effectively detected by the wireless cable sensor, and the cable tension measured is consistent with the base frequency of the vibration. Our work provides an alternative approach for cable tension measurement in the succeeding construction of the FAST.
出处
《天文研究与技术》
CSCD
2011年第1期21-28,共8页
Astronomical Research & Technology
基金
国家自然科学基金(10778625)资助
