矿用光纤热线式风速传感器设计
Industry and Mine Automation(2021)
Abstract
实时、准确地获取风速数据,有助于精准控制矿井风流.现有的热线式、叶轮式、超声波涡街式、差压式等矿用风速传感器或易受干扰,或无法检测微风速,或量程小,且均通过电信号获取风速,存在安全隐患.基于掺杂光纤光热转换特性和光纤Bragg光栅(FBG)测温原理,设计了一种矿用光纤热线式风速传感器,通过掺杂光纤将光能转换为热能,通过解调热交换下FBG中心波长漂移量推算传感探头温度变化,进一步计算出风速.在FBG解调过程中采用光栅复用技术,实现了多台传感器共用同一光源和解调仪,降低了成本.实验室测试结果表明:FBG中心波长漂移量与风速呈非线性关系;在较低的风速范围内,泵浦光源功率越高,FBG中心波长漂移范围越大,风速检测灵敏度越高,风速为0~0.57 m/s时,传感器灵敏度为1 370 pm/(m·s-1),最高分辨率达0.7 mm/s;传感器响应时间随风速增大而减小,波长动态范围随之增大.现场测试结果表明:该传感器可实现煤矿井下微风速、低风速检测,稳定性较好,监测值能准确反映现场风速变化.
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Key words
mine ventilation,wind speed sensor,optical fiber sensing,hot-wire-based optical fiber,doped optical fiber,optical fiber bragg grating,grating multiplexing demodulation
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