Abstract
A concentration measuring system based on DSP video processing was established to monitoring dynamically two-dimensional concentration changes for solution.The refractive index changes of the solution were detected by a Mach-Zehnder interferometer,and the interferometric fringes were recorded by a CCD on site.Finally,a DSP was used to process the video images of interferometric fringes to obtain the solution concentration changes.Furthermore,both the hardware platform and the video-processing algorithm of the system were described in detail.The experimental test indicates that the system can provide quantitative measurement for a single-component solution and a multiplecomponent solution with one main component change.An experiment on potentiodynamic polarization of the electrode in the H2 SO4 solution with a concentration of 0.5mol/L at 2mV·s-1 shows that the peak concentration of FeSO4 solution at the electrode/electrolyte interface is(9.2 ± 0.2)×10-3 mol/L when the iron electrode potential is-0.428V.The system has high precision and strong stabilization in online testing and can be employed in measurement of the concentration changes of the solution in real time.
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