Study On Purity Test Of Cleaning Solution For Optical Lenses Based On Electrolytic Conductivity

The cleaning of optical lenses and various optical instruments consisting of optical lenses in using process often requires water and cleaning fluids.Moreover,the cleaning process is also an important step in the production process of optical lenses,which also involves the formulation and purity of the cleaning agent.Conductivity is an intrinsic property of a substance that can be used to characterize a substance.In order to check whether the purity of the solution meets the cleaning requirements,the conductivity value of the solution can be used to judge.It is also possible to judge the degree of cleanness of the mirror by comparing the conductivity values of the solution twice before and after the cleaning.At present,the measurement of the conductivity of the solution is mostly based on the electrode measurement method,and it is intended to obtain the resistance value of the solution,thereby calculating the conductivity value.Based on the previous researches,this thesis proposes a new measurement by analyzing the two-electrode conductance cell from the complex impedance plane.The complex impedance of the cell is represented by a formula containing resistance,capacitance and frequency.And a series of deduced calculations is performed to obtain a quadratic equation about the unknown resistance of the solution.Then,the analytical solution of the resistance expressed by the mathematical formula is derived through solving the root of the quadratic equation.The sine wave voltage with stable frequency and constant amplitude is selected as the triggering signal in the measurement system to measure the voltage and response current through the cell.And active power is also the same.After calculating their effective values,the resistance value of the solution is obtained according to the formula proposed by the thesis.Finally we get the conductivity.The experimental results show that the relative error of the solution resistance is extremely small by using the mathematical solution model proposed in this thesis.Provided that the frequency of triggering signal is selected appropriately,the relative error can be further reduced,thereby ensuring the accuracy of subsequent calculations and improving the measurement accuracy.This method will have a good effect in the purity inspection of the optical lens’ s cleaning solution.Additionally,the expression of the capacitive reactance value obtained in the derivation process of this thesis is the equivalent capacitive reactance value of the electrode polarization in the conductance cell,which hinders the excitation signal.It can quantify the degree of electrode polarization and evaluate the accuracy of the measurement by using the capacitive reactance value.This provides a new route for future related research and production activities.