用反射率和低相干技术测容器内液体的折射率
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摘要
为测量透明容器内液体的折射率,建立了基于容器内表面反射率测量的低相干技术实验系统。系统采用宽带低相干半导体激光光源和改进的迈克尔逊干涉仪,将装有待测液体的容器放入测量臂光路中,调节参考臂的光程,使由容器前壁内表面反射光的光程与来自参考臂反射光的光程相等,出现干涉现象。捕捉并记录下此干涉信号,并从中求出容器前壁内表面反射光的强度,再结合菲涅尔公式及反射率的定义,即可求出待测液体的折射率,其测量精度与阿贝折射仪相当。方法能够方便、快捷、准确地测出容器内液体的折射率,可用于食品、生物医学检验等领域内液体浓度或折射率的实时非接触监测。
In order to measure the refractive index of liquid in a transparent container, a low coherence interference measuring experimental system based on the measurement of the reflectivity of the container's internal surface is established. Broadband low coherence laser diode light source and improved Michelson interferometer are adopted in the system. The container with a liquid to be measured is put into the optical path in its measuring arm, and then optical path of the reference arm is adjusted. When the optical path of a reflected light from the inner surface of the container's front wall is equal to the optical path of a reflected light from reference arm, there will be interference phenomenon. These interference signals are captured and recorded, and the intensity of reflected light from the inner surface of the container's front wall could be obtained from these recorded interference signals. The refractive index of the liquid can be obtained by combining the Fresnel Formula and the definition of reflectivity, and its measurement accuracy is equivalent to the Abbe refractometer. This method is convenient, quick and accurate in measuring the refractive index of liquids in the container and can be used for real-time non-contact monitoring liquid concentrations or refractive index in testing food, biomedicine and other fields.
In order to measure the refractive index of liquid in a transparent container, a low coherence interference measuring experimental system based on the measurement of the reflectivity of the container's internal surface is established. Broadband low coherence laser diode light source and improved Michelson interferometer are adopted in the system. The container with a liquid to be measured is put into the optical path in its measuring arm, and then optical path of the reference arm is adjusted. When the optical path of a reflected light from the inner surface of the container's front wall is equal to the optical path of a reflected light from reference arm, there will be interference phenomenon. These interference signals are captured and recorded, and the intensity of reflected light from the inner surface of the container's front wall could be obtained from these recorded interference signals. The refractive index of the liquid can be obtained by combining the Fresnel Formula and the definition of reflectivity, and its measurement accuracy is equivalent to the Abbe refractometer. This method is convenient, quick and accurate in measuring the refractive index of liquids in the container and can be used for real-time non-contact monitoring liquid concentrations or refractive index in testing food, biomedicine and other fields.
引文
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[17] 姚军财. 基于小波变换和奇异值分解的图像水印算法研究[J]. 光学技术,2017,43(5):439—444.Yao Juncai. Image watermark algorithm base on the discrete wavelet transform and singular value decomposition[J].Optical Technique,2017,43(5):439—444.
[18] 郭继坤,马鹏飞, 赵肖东, 等. 基于新阈值函数的小波阈值去噪算法及仿真[J]. 工业仪表与自动化装置,2015,24(1):117—121.Guo Ji kun, Ma Pengfei, Zhao Xiaodong, et al. Wavelet threshold noising algorithm and simulation based on the new threshold function[J]. Industrial Instrumentation & Automation,2015,24(1):117—121.
[19] 李飞. 用MATLAB绘制粒度分布R-R-B线图[J]. 矿山工程,2015,3(3):166—171.Li Fei. Drawing grain size distribution R-R-B line diagram by MATLAB[J]. Mine Engineering,2015,3(3):166—171.
[20] 姜良广, 孙鹏. 水的折射率与波长间函数关系的模型[J]. 光谱实验室,2002,19(4):127—130.Jiang Liangguang, Sun Peng. Models of the wavelength dependence for the index of refraction of water[J]. Chinese Journal of Spectroscopy Laboratory,2002,19(4):127—130.
[2] 汪晓春, 杨博文, 何冬慧. 一种基于迈克尔逊干涉仪测量透明液体折射率的方法[J]. 光学仪器,2012,34(5):1—4.Wang Xiaochun, Yang Bowen, He Donghui. A method to measure refractive index of transparent liquid based on michelson interferometer[J]. Optical Instruments,2012,34(5):1—4.
[3] 魏重光, 唐海泉, 菅傲群, 等. 基于SPR的液体折射率检测研究[J]. 科学技术与工程,2016,16(21): 62—66.Wei Chongguang, Tang Haiquan, Jian Aoqun, et al. Detection research of liquid refractive index based on SPR[J]. Science Technology and Engineering,2016,16(21):62—66.
[4] 阙如月, 刘一, 孙慧慧, 等.基于光纤内双开口 F-P干涉腔的折射率传感器[J].激光技术,2014,38(6):780—784.Que Ruyue, Liu Yi, Sun Huihui, et al. Refractive index sensor based on F-P interferometer cavity in optical fiber with double-openings[J]. Laser Technology,2014,38(6):780—784.
[5] Li Qiang, Pu Xiaoyun. Measurement of the refractive index of microquantity liquid filled in a capillary and a capillary wall without destruction[J]. Applied Optics,2014,52(21):5318—5326.
[6] 李强, 孙丽存, 韩广辉, 等. 毛细管成像法精确测量微量液体的折射率[J]. 光学精密工程,2012,20(7):1440—1446.Li Qiang, Sun Licun, Han Guanghui, et al. Measurement of refractive index of micro-quantity liquid by glass capillary imaging[J]. Opt. Precision Eng. ,2012,20(7):1440—1446.
[7] Sergio C, Neil C B, Martha R A. Diffraction gratingbased sensing optofluidic device for measuring the refractive index of liquids[J]. Optics Express,2016,24(1):180—190.
[8] Luis M, Geoff B, Philip K, et al. Long period gratings coated with hafnium oxide by plasma-enhanced atomic layer deposition for refractive index measurements[J].Optics Express,2016,24(7):7654—7669.
[9] Zilio S C. Simultaneous thickness and group index measurement with a single arm low-coherence interferometer[J]. Optics Express,2014,22(22):27392—27397.
[10] Zhang Nan, Georges H, Wu Zhifang, et al. In-line optofluidic refractive index sensing in a side-channel photonic crystal fiber[J]. Optics Express,2016,24(24):27674—27682.
[11] Maciel M J, Costa C G, Silva M F, et al. A wafer-level miniaturized michelson interferometer on glass substrate for optical coherence tomography applications[J]. Sensors and Actuators A: Physical,2016,242(3):210—216.
[12] Gihyeon M, Woo J C, Ju W K, et al. Refractive index measurements of multiple layers using numerical refocusing in FF-OCT[J]. Optics Express,2013,21(24):29955—29967.
[13] Seokhan K, Jihoon N, Myoung J K, et al. Simultaneous measurement of refractive index and thickness by combining low-coherence interferometry and confocal optics[J]. Optics Express,2008,16(8):5516—5526.
[14] 范希智. 物理光学[M]. 北京:清华大学出版社,2016: 30—36.Fan Xizhi. Physical optics[M]. Beijing:Tsinghua University Press,2016:30—36.
[15] 梁铨廷. 物理光学[M]. 北京:电子工业出版社, 2012:91—92.Liang Quanting. Physical optics[M]. Beijing: Publishing House of Electronics Industry, 2012:91—92.
[16] 张浩, 郑刚, 李振洋, 等. 基于低相干光干涉的液体折射率测量[J]. 光学仪器,2017,39(3):1—5.Zhang Hao, Zheng Gang, Li Zhenyang, et al. Liquid refractive index measurement based on optical low coherence interferometry[J]. Optical Instruments,2017,39(3):1—5.
[17] 姚军财. 基于小波变换和奇异值分解的图像水印算法研究[J]. 光学技术,2017,43(5):439—444.Yao Juncai. Image watermark algorithm base on the discrete wavelet transform and singular value decomposition[J].Optical Technique,2017,43(5):439—444.
[18] 郭继坤,马鹏飞, 赵肖东, 等. 基于新阈值函数的小波阈值去噪算法及仿真[J]. 工业仪表与自动化装置,2015,24(1):117—121.Guo Ji kun, Ma Pengfei, Zhao Xiaodong, et al. Wavelet threshold noising algorithm and simulation based on the new threshold function[J]. Industrial Instrumentation & Automation,2015,24(1):117—121.
[19] 李飞. 用MATLAB绘制粒度分布R-R-B线图[J]. 矿山工程,2015,3(3):166—171.Li Fei. Drawing grain size distribution R-R-B line diagram by MATLAB[J]. Mine Engineering,2015,3(3):166—171.
[20] 姜良广, 孙鹏. 水的折射率与波长间函数关系的模型[J]. 光谱实验室,2002,19(4):127—130.Jiang Liangguang, Sun Peng. Models of the wavelength dependence for the index of refraction of water[J]. Chinese Journal of Spectroscopy Laboratory,2002,19(4):127—130.