基于数字全息的液相扩散系数测量  

Measurement of Liquid Diffusion Coefficient Based on Digital Holography

作　　者：邓定南 黄炳富 贺智忠 吕才良 罗威 DENG Ding-nan;HUANG Bing-fu;HE Zhi-zhong;LV Cai-liang;LUO Wei(School of Physics and Electronic Engineering,Jiaying University,Meizhou 514015,China)

机构地区：[1]嘉应学院物理与电子工程学院,广东梅州514015

出　　处：《嘉应学院学报》2022年第6期16-21,共6页Journal of Jiaying University

基　　金：广东省基础与应用基础研究基金(2020A1515110283);广东省高校省级重点平台及科研项目(2020KQNCX078);深圳大学光电子器件与系统教育部/广东省重点实验室开放基金资助项目(GD202105);嘉应学院高等教育教学改革重点项目(JYJG2022118);广东省教育科学规划课题(高等教育专项)(2022GXJK336);广东大学生科技创新培育专项资金资助项目(pdjh2021b0467);大学生创新创业训练计划项目(202110582001)。

摘　　要：提出一种数字全息定量测量液相扩散系数的方法.采用Mach-Zehnder干涉系统实时采集不同时刻溶液混合扩散时的数字全息图,通过数值重建算法得到相应的展开相位分布.将T_(1)和T_(2)时刻全息图恢复的展开相位分布相减得到展开相位差分布,从展开相位差分布中可得到浓度变化极值距离△Z_(m),将T_(1)、T_(2)、△Z_(m)代入求解方程即可得到扩散系数值.为验证所提方法有效性,分别测量了0.1mol/L蔗糖溶液、0.33mol/L氯化钾溶液与蒸馏水混合时的扩散系数值,平均测量值与参考值的相对误差绝对值分别为2.69%和3.096%.实验结果表明,利用数字全息技术可以准确和有效测量液相扩散系数.A method based on digital holography for quantitatively measuring the liquid diffusion coefficient is proposed.The digital holograms at different times were real-time recorded by Mach-Zehnder interferometric system when the solution was mixed and diffused,and the corresponding unwrapped phase distribution was obtained through the numerical reconstruction algorithm.The unwrapped phase difference distribution can be obtained by subtracting the unwrapped phase distributions recovered from the holograms at T_(1) and T_(2).From the unwrapped phase difference distribution,the concentration changes extremum distance △Z_(m) can be obtained.Then the diffusion coefficient value can be calculated by substituting T_(1),T_(2),and △Z_(m) into the solving equation.In order to verify the effectiveness of proposed method,the diffusion coefficient values of 0.1 mol/L sucrose solution,0.33 mol/L potassium chloride solution mixed with distilled water were measured respectively.The absolute values of the relative error between the average measurement value and the reference value were 2.69%and 3.096%,respectively.The experimental results show that digital holography can accurately and effectively measure the liquid diffusion coefficient.

关 键 词：液相扩散系数 数字全息 相位测量 

分 类 号：TN247[电子电信—物理电子学]