基于倾斜光纤光栅的液位传感特性研究
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摘要
研究了一种基于倾斜光纤布拉格光栅(TFBG)的液位传感器,利用OptiGrating软件仿真分析了外界折射率和温度对TFBG透射谱的影响,仿真结果表明,当外界折射率为1.408～1.444时,TFBG透射谱包层模的透射谱幅值随外界折射率的增大逐渐减小,且不受温度的影响,但峰值波长随温度升高而增加。同时,搭建了液位和温度测量实验装置,对不同浓度的5种甘油溶液进行液位测量,并采用包层模归一化面积作为液位测量量度来提高灵敏度,证实随着液位的升高,归一化面积逐渐减小,且溶液折射率越接近包层折射率,液位测量灵敏度越高。同时,可利用TFBG布拉格谐振峰中心波长的漂移量与包层模归一化面积实现温度与液位的同时测量。
A liquid level sensor based on tilted fiber Bragg grating(TFBG)is designed.The influence of external refractive index and temperature on the transmission spectrum of TFBG are analyzed by optigrating software.The simulation results show that transmission spectrum amplitude of each mode decrease with the increase of the external refractive index as the external refractive index is1.408～1.444 and are not affected by the temperature,but the wavelength is red shifted with the temperature increasing.At the same time,the experimental device is set up to measure the liquid level and temperature for five different concentration of glycerine solution.The cladding mode normalization area is used as a liquid level measurement metrics to improve sensitivity.The experimental result confirms that the normalized area decreases with the increase of liquid level and the level measurement sensitivity is higher as the cladding refractive index is closer to the solution refractive index.Therefore,the temperature and liquid level can be simultaneous measured by the TFBG.
A liquid level sensor based on tilted fiber Bragg grating(TFBG)is designed.The influence of external refractive index and temperature on the transmission spectrum of TFBG are analyzed by optigrating software.The simulation results show that transmission spectrum amplitude of each mode decrease with the increase of the external refractive index as the external refractive index is1.408～1.444 and are not affected by the temperature,but the wavelength is red shifted with the temperature increasing.At the same time,the experimental device is set up to measure the liquid level and temperature for five different concentration of glycerine solution.The cladding mode normalization area is used as a liquid level measurement metrics to improve sensitivity.The experimental result confirms that the normalized area decreases with the increase of liquid level and the level measurement sensitivity is higher as the cladding refractive index is closer to the solution refractive index.Therefore,the temperature and liquid level can be simultaneous measured by the TFBG.
引文
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[2] BERTO F J.Hydrostatic tank gauges accurately measure mass,volume,and level[J].Oil & Gas Journal,1990,88(20):57-59.
[3] PRAVEEN K,RAJINIGANTH M P,ARUN A D,et al.A novel technique towards deployment of hydrostatic pressure based level sensor in nuclear fuel reprocessing facility[J].Review of Scientific Instruments,2016,87(2):025111.
[4] 白泽生,刘竹琴.基于双差压法测液位的研究与设计[J].仪表技术与传感器,2010(1):73-75.
[5] PACZESNY D,TARAPATA G,MARZECKI M,et al.The capacitive sensor for liquid level measurement made with ink-jet printing technology[J].Procedia Engineering,2015,120:731-735.
[6] GONG C S A,CHIU H K,HUANG L R,et al.Low-cost comb-electrode capacitive sensing device for liquid-level measurement[J].IEEE Sensors Journal,2016,16(9):2896-2897.
[7] 徐红,郭鹏,田振华,等.非浸入式超声导波液位测量方法研究[J].仪器仪表学报,2017,38(5):1150-1157.
[8] FISHER D K,SUI R.An inexpensive open-source ultrasonic sensing system for monitoring liquid levels[J].Agricultural Engineering International:CIGR Journal,2013,15(4):328-334.
[9] ALBERTO N J,PINTO J L,MARQUES C A,et al.Simultaneous strain and refractive index sensor based on a TFBG[C].Proceedings of SPIE-The International Society for Optical Engineering,Porto:2010,7653(6):765324.
[10] OSUCH T,JUREK T,MARKOWSKI Konrad.Simultaneous measurement of liquid level and temperature using tilted fiber bragg grating[J].IEEE Sensors Journal,2016,16(5):1205-1209.
[11] JIANG Q.A novel oil level monitoring sensor based on string tilted fiber Bragg grating[J].Optoelectronics Letters,2011,7(3):171-174.
[12] JIANG Q,HU D,YANG M.Simultaneous measurement of liquid level and surrounding refractive index using tilted fiber Bragg grating[J].Sensors & Actuators A Physical,2011,170(1):62-65.