基于LabVIEW和光纤传感器的液漏监测系统设计

Design of liquid leakage monitoring system based on LabVIEW and optical fiber sensor

摘要:

针对传统液漏传感器检测精度低、空间分辨率小以及不能实时监测多点位液漏等问题，利用LabVIEW设计了一个基于光纤传感器的液漏监测系统。整个系统包括传感器和上位机两个部分。其中，光纤带式传感器负责采集漏水点的信号，其传感功能的实现基于侧向耦合效应。LabVIEW上位机负责实时监测多点位液漏状态，实现了采集数据的处理、存储和显示功能。上位机和传感器之间采用USB接口通信。实验结果表明，该系统能够对8 m区域范围内，160个点位的漏水状态实时精确定位及报警，漏检率≤10 %，位置精度介于±25 mm，较传统液漏传感系统，其空间分辨率提升了10 %。对于当前设备存在的漏检和误报的问题，给出了误差分析及改进思路。通过LabVIEW实时显示多点位漏水状态，能够提高工作效率，适用于对漏水监测有较高要求的场合。

Abstract:

Aiming at the problems of low detection accuracy, low spatial resolution, and inability to monitor multi-point liquid leakage in real time of traditional liquid leakage sensors, we design a liquid leakage monitoring system based on optical fiber sensor by LabVIEW. The whole system consists of two parts: the sensor and the upper computer. Between them, the fiber optic belt sensor is responsible for collecting the signal of water leakage point, and its sensing function is realized based on the lateral coupling effect. LabVIEW is responsible for real-time monitoring of multi-point liquid leakage state, and realizes the processing, storage and display of collected data. USB interface is used to communicate between the computer and the sensor. The evaluations show that the system can accurately locate and alarm the leakage status of 160 points within 8 m area in real time. Its missing detection rate ≤10 %, position accuracy < ±25 mm. Compared with the traditional liquid leakage sensing system, its spatial resolution is improved by 10 %. The real-time display of multi-point leakage status by LabVIEW can improve the work efficiency and is suitable for occasions with higher requirements for leakage monitoring.