Measuring the concentration of transparent liquid based on microfluidic chip
The comprehensive experiment project of using a microfluidic chip to measure the con-centration of transparent liquid was developed based on the winning project of the 8th Chinese Under-graduate Physics Experiment Competition and the related research results.In this experiment project,a double-channel microfluidic chip was designed and fabricated,and then used as a two-slit interferom-eter.The concentration-known transparent liquid and the concentration-unknown test liquid were re-spectively input into the device,and a CCD camera was used to receive and collect the double-slit in-terference image of the laser.Based on the relation between the change of concentration and the change of optical path difference,the measurement of the transparent liquid concentration could be a-chieved by analyzing the fringe movement distance before and after the concentration change.This project effectively combined the content and image processing of the basic optical double-slit interfer-ence experiment with microfluidic chip technology.The experiment was of high accuracy,and greatly enriched the teaching content of basic physics experiment,which could be used as a classification-hier-archical research experimental teaching project.
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