一种基于高衰减光纤的光纤光栅热线式流量计  

A Hot-Wire Flowmeter Based on Fiber Bragg Grating with High Attenuation Fiber

作　　者：贾振安[1,2,3,4] 任杰 白燕 樊伟[1,2,3,4] JIA Zhen-an;REN Jie;BAI Yan;FAN Wei(School of Science,Xi′an Shiyou University,Xi′an 710065,China;Shaanxi Engineering Research Center of Oil and Gas Resource Optical Fiber Detection,Xi′an 710065,China;Shaanxi Key Laboratory of Measurement and Control Technology for Oil and Gas Wells,Xi′an 710065,China;Key Laboratory of CNPC-Research Laboratory for Optical Fiber Dynamic Detection of Oil Reservoirs,Xi′an 710065,China)

机构地区：[1]西安石油大学理学院,陕西西安710065 [2]陕西省油气资源光纤探测工程技术研究中心,陕西西安710065 [3]陕西省油气井测控技术重点实验室,陕西西安710065 [4]CNPC重点实验室——油藏光纤动态检测研究室,陕西西安710065

出　　处：《红外》2023年第4期42-48,共7页Infrared

基　　金：陕西省教育厅重点实验室科研计划项目(18JS093);CNPC测井重点实验室基金项目(20216328)。

摘　　要：为了发展全光学流量测量技术,提出了一种基于掺钴高衰减光纤的光纤光栅热线式流量计。通过解调光纤布拉格光栅(Fiber Bragg Grating,FBG)中心波长进行流量测量,具体包括传感器制作、温度传感特性测定和流量测量实验。结果表明,基于衰减系数为8.9 dB/cm、工作波长约为1480 nm的掺钴光纤的FBG具有10.3 pm/℃的温度灵敏度;流量计在400~3700 L/h液体流量范围内可高重复性地实现测量;流量--FBG中心波长遵循特定非线性函数计算模型;流量计的平均灵敏度约为0.15 pm/(L·h^(-1)),低流速下灵敏度最高可达到1 pm/(L·h^(-1))。所提出的流量计丰富了光纤光栅用于液体流量测量的研究。设计中采用了掺钴高衰减光纤自发热和单端毛细管封装,为流量传感器的全光学化、微型化和高灵敏度发展提供了新思路。In order to develop all-optical flowrate measurement technology,a hot-wire flowmeter based on cobalt-doped high-attenuation fiber Bragg grating is proposed,and the flowrate measurement is achieved by demodulating the central wavelength of the fiber Bragg grating.The research process includes sensor fabrication,temperature sensing characteristics measurement and flowrate measurement experiments.The results show that the fiber Bragg grating has a temperature sensitivity of 10.3 pm/°C based on the fiber with an attenuation coefficient of 8.9 dB/cm(1480 nm),and the flowmeter can realize highly repeatable measurements in the range of 400~3700 L/h.The flowrate and the central wavelength of the fiber Bragg grating follow a specific nonlinear function.The average sensitivity of the flowmeter is about 0.15 pm/(L·h^(-1)),and the sensitivity can be up to 1 pm/(L·h^(-1))at lower flow rates.The proposed flowmeter enriches the research of fiber Bragg grating for liquid flow measurement.In the design,cobalt-doped high attenuation fiber self-heating and single-end capillary packaging are used,which provides a new idea for the development of full optics,miniaturization and high sensitivity of flow sensor.

关 键 词：光纤布拉格光栅 流量计 高衰减光纤 灵敏度 

分 类 号：TN253[电子电信—物理电子学]