Target-type fiber-optic flowmeter based on a cascaded cantilever beam with constant strength  

作　　者：Shaoling He Yi Zhang Bo Li Haiting Sun 何少灵;章奕;李博;孙海亭(Hangzhou Applied Acoustics Research Institute,Hangzhou 310012,China)

机构地区：[1]Hangzhou Applied Acoustics Research Institute,Hangzhou 310012,China

出　　处：《Chinese Optics Letters》2024年第12期19-25,共7页中国光学快报(英文版)

摘　　要：We propose a novel target-type fiber Bragg grating(FBG)flowmeter based on a cascaded cantilever beam with a simple structure in this paper.Such a cascaded cantilever beam consists of two sections with constant strength but different dimensions,where two FBGs connected in series are glued on the surface of the two sections.Bending occurs when the target of the beam is rushed by a flow,which results in different strain-induced wavelength shifts for the two FBGs.Because the two FBGs have the same responses to ambient temperature and pressure changes,a differential wavelength shift that is insensitive to the ambient influences can be simply realized by monitoring the wavelength separation change of the FBGs.So that temperature-and pressure-independent flow rate sensing can be performed.Finally,we experimentally validate that ambient temperature and pressure fluctuations do not affect the proposed FBG flowmeter,where a sensing accuracy of 0.015 m^(3)/h and a measurement range from 0 to 1 m^(3)/h are achieved.Based on its simple structure and low cost,this flowmeter has broad application prospects in the industrial field.

关 键 词：cascaded cantilever beam with constant strength fiber Bragg grating FLOWMETER 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TH814[自动化与计算机技术—控制科学与工程]