Study and Application of the Measurement Method of Phase Difference in the Single Component Dye Solution Concentration

Spectrophotometer can accurately detect the medium-light color dye concentration but will produce a large error for the dark or very light color dye solution. In this paper, the laser is used as the test signal and expressed in the form of optical quantum wave function, the dye solution is regarded as a one-dimensional square potential barrier, a model is established between the single component dye concentration and the phase difference of transmitted light that tunneled the barrier. The experimental device for the relationship between the dye concentration and the phase difference of transmitted light is designed. The model coefficients were obtained by the experimental data and the least square method, and finally, the model of laser measurement the dye concentration online was obtained. The dye concentration in the model is proportional to the phase difference of transmitted light, which is easy to calculate and measure. The accuracy of the model was verified by experiments.