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利用数字全息干涉技术测量了电极过程中电极/溶液界面处溶液的浓度变化分布。以铁电极在0.5mol/dm3硫酸溶液中恒电位电流振荡的活化过程为例,测量了反应初始时刻1.6s内铁电极界面处的溶液浓度变化情况。由于在全息干涉测量中引入载波条纹,所以能够方便地应用傅里叶分析方法分析计算干涉条纹的动态变化。通过对全息干涉图像序列的分析计算得到了电极反应过程中溶液浓度变化所引起的物光相位变化,并把相位差分布用来描述浓度变化分布。计算结果显示,在反应进行到1.6s时,溶液浓度变化引起的物光峰值相位差为41.2rad,相应的溶液折射率改变量为0.0021。重建图像比较直观地再现了反应过程中溶液的浓度变化、扩散层厚度等信息,从而为动态半定量分析和检测浓度变化提供了一种新的方法。
The digital holographic interferometry was used to measure the concentration distribution of the solution at the electrode / solution interface during the electrode process. Taking the activation of ferroelectric potentials oscillating in 0.5mol / dm3 sulfuric acid solution as an example, the change of solution concentration at the interface of ferroelectrics at the initial time of 1.6s was measured. Due to the introduction of carrier fringes in the holographic interferometry, the dynamic analysis of the interference fringes can be easily calculated and analyzed by Fourier analysis. Through the analysis and calculation of the holographic interference image sequence, the phase change of the object light caused by the change of the solution concentration during the electrode reaction process is calculated and the phase difference distribution is used to describe the change of the concentration distribution. The calculated results show that when the reaction proceeds to 1.6 s, the phase difference of the peak value of the object light caused by the change of the solution concentration is 41.2 rad, and the corresponding refractive index change of the solution is 0.0021. Reconstruction of the image more intuitive reproduction of the reaction solution concentration changes, diffusion layer thickness and other information, thus providing a new method for dynamic semi-quantitative analysis and detection of concentration changes.