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Sensitivity-Enhanced hot-wire anemometer by Using Cladding-Etched Fiber Bragg Grating

Photonic Sensors 2023年第3期13卷 1-7页

作者： Yuhan TANG Xuke CHEN Jiarui ZHANG Dajuan LV Liangming XIONG Xinyong DONG School of Physics and Optoelectronic Engineering Guangdong University of TechnologyGuangzhou 510006China Guangdong Provincial Key Laboratory of Information Photonics Technology Guangzhou 510006China Institute of Optoelectronic Technology China Jiliang UniversityHangzhou 310018China School of Information Engineering Guangdong University of TechnologyGuangzhou 510006China State Key Laboratory of Optical Fiber and Cable Manufacture Technology Wuhan 430073China Southern Marine Science and Engineering Guangdong Laboratory Zhuhai 519000China

A sensitivity-enhanced hot-wire anemometer based on a cladding-etched optical fiber Bragg grating(FBG)coated with a layer of silver film and optically heated by using a 1480nm laser diode is *** silver film absorbs the laser power to heat the FBG to a certain high temperature and the airflow cools down the FBG hot-wire with the cooling effect and hence the Bragg wavelength of the FBG is determined by the airflow *** measurement results show that the heating efficiency of the FBG hot wire is improved by 3.8times in magnitude by etching the fiber cladding from 125μm down to 73.4μm,and the achieved airflow velocity sensitivities,under a laser power of 200mW,are–3180pm/(m/s),–889pm/(m/s),–268pm/(m/s),and–8.7pm/(m/s)at different airflow velocities of 0.1m/s,0.5m/s,1.5m/s,and 17m/s,*** comparison,the sensitivities are only–2193 pm/(m/s),–567 pm/(m/s),–161 pm/(m/s),and–4.9pm/(m/s)for the reference anemometer without cladding etching even at a much higher heating laser power of *** results prove that the method by using a cladding-etched FBG to improve sensitivity of FBG-based hot-wire anemometers works and the sensitivity is improved significantly.

关键词： Fiber Bragg grating hot-wire anemometer optical fiber sensors

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Experimental and numerical investigation of controlled disturbances development from two sources in supersonic boundary layer

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Advances in Aerodynamics 2019年第1期1卷 288-300页

作者： G.L.Kolosov A.D.Kosinov A.N.Semenov A.A.Yatskikh Khristianovich Institute of Theoretical and Applied Mechanics SB RAS Novosibirsk 630090Russia

The paper presents the experimental results and the results of direct numerical simulation of the development and interaction of two wave trains from two point sources of controlled disturbances in a supersonic boundary layer on a flat plate with an incident flow Mach number of *** were located parallel to the leading edge of the *** the introduction of controlled disturbances into the boundary layer,the normal component of the mass flow rate was varied in the *** the experiment,periodic glow discharges at a frequency of 20 kHz were *** both cases,the disturbances sources worked *** flow rate pulsations were measured and recorded in sections,parallel to the leading edge of the model,near the maximum of disturbances along the boundary *** the experiment,a constanttemperature hot-wire anemometer was *** performing a discrete Fourier transform,the spatial distributions of disturbances,the beta-spectra were determined,and the wave characteristics of the development of disturbances downstream were *** addition,direct numerical simulation of the downstream development of disturbances from a single source was *** work presents a comparison of experimental and theoretical calculated *** paper discusses the effects inherent in the interaction of unstable traveling controlled disturbances from two sources operating synchronously.

关键词： :DNS Computational modeling Supersonic boundary layer Compressibility Discharge Flat plate hot-wire anemometer Instability Turbulence

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