Design Of Automatic Measurement System For The Light Scattering Of Micrometer-sized Particles Based On Microfluidic Technology

The research on light scattering characteristics of particles has been widely used.The existing methods of particle scattering measurement are mainly for a group particles or single particle of small scattering distribution measurement.The design of the measurement system is relatively complex,lacking large angle range for single particle or several particles,and lacking an effective measurement method to solve the measurement of the scattering distribution of particles at large angle ranges.In this thesis,an automated particle scattering measurement system based on microfluidic technology is designed.The microfluidic chip is used to realize the control of the micro-particles.The electro-rotating stage,4F optical system,Data acquisition card as the core of the automated measurement system.Design the rotary stage and the data acquisition card automated measurement program based on LabVIEW platform.Measurement system achieve large angular range of scattered light scattering measurements and the automation of the measurement process,reducing the h?man involved in the measurement and data acquisition process which causing inaccurate measurement.In this thesis,the experimental system was validated and the scattering distribution of single and double particles was measured.The actual measurement experiment was carried out with particle size of 23.75?m as the experimental object.The actual measuring range could reach2?-162?.The measurement results are in good agreement with the theoretical curves.The results show that the measurement error is within 10%,and the results of multiple experiments are matched well too.The repeatability experiment proves that the system is effective and stable.The above results show that the system designed in this thesis has good stability and can accurately and accurately measure the scattering distribution of large angle particles.