关键词: 安全监测, 振弦式传感器, 前端采集器, 手持机, 无线传输

Abstract: In order to solve the real-time and non-contact problems in collecting dam safety monitoring information during the construction of water conservancy project, a micro-power measurement system of vibrating wire sensor based on wireless network is developed. The system consists of two parts: the front collector and the handset. By applying the same pressure on test table, we compare the frequencies measured by this system and BGK-408 Reader. Results show that the absolute error of measured mean frequencies between the two measurement systems is less than 0.25 Hz,which proves that the collection accuracy of this developed system meets design requirements and practical engineering needs. The system has functions of remote collection (more than 80m), transmission, storage and analysis of monitoring data for dam safety. It can instantly track the dynamic changes of monitoring data for dam safety, and well meets the real-time demands for the monitoring data, which cannot be satisfied by traditional wire measurement systems and other wireless measurement system during construction. The system is of high measurement accuracy, low power consumption, stable performance, convenient application, flexible installation, low labor intensity for its users, low construction and maintenance cost and strong in-spot adaptive ability.

Key words: safety monitoring, vibrating wire sensor, front collector, handset, wireless transmission