A Preliminary Sdudy Of Dual-Phase Scaning Interference Laser Speckle Technology And Its Characterization Applications

Laser speckle phenomenon researches have been developing in the way ofthe theoretical and experimental studies combined closely together. A laserspeckle experiment focuses on the two goals in the theory and the applications.Laser speckle technology could take advantage of untouched, undamaged,real-time measurement and could be applied in physical and chemical science,medicine, biology, and industry and engineering field. Therefore, it has a greatsignificance to study laser speckle technology and its application.The thesis has not only designed the dihedral90°scattering structure so asto resolve the issues in the crystal flocking process of the solar cells, but also theeffectiveness of laser speckle theory in lager distribution angle has beenexamined, synchronizedly studying the characterization of the crystal flockingprocess that effected the solar energy efficiency. Base on the experimental andtheoretical researches, the double phase scanning laser speckle interferometryand the transverse scan additional phase synchronized compensation have beenputs forward. The dynamic speckle property testing and the calculation changeshave been realized. And in a magnetic fluid display device, the magneticnano-particle movement and morphology characterization has been analyzedsynchronizedly. The study on the main results is as follows,1. Designed a model of the dihedral90°scattering structure in the laserspeckle experiment, constructed a laser speckle model of the large anglescattering distribution to study the solar cell surface of the crystal flocking, analyzed the large angle scattering distribution characteristics of laserspeckle. Get the average contrast of0.64of the large distribution anglespeckle in the single surface structure, and the average contrast of0.79inthe90-dihederal structure large distribution angle speckle. The result showthat the laser speckle contrast is less than1in the flocking surface of thesolar cells related the large distribution angle speckle. The scattering of thestatistical properties is in consistent with weak scattering speckle theory.2. In the compare of the laser speckle in the large distribution angle to the laserspeckle of a single surface, it is better that the large scattering angledistribution of the laser speckle model could characterize the cell surfacemorphology of crystal flocking。The results are (1) the contrast in largescattering angle distribution of the laser speckle by the solar cell isimproved;(2) the optical vortex density is larger than that of thesingle-surface laser speckle.(3) Defining the crystal flocking defect ratio,the smaller the ratio, the less the velvet defects.3. Compared several laser speckle calculation, introduced optical vortex toanalyze the laser speckles, and put forward the optical vortex to measuredisplacement and improved the algorithm speed of the displacement, andmight be used in the dynamic laser speckles of real time measurement.4. Using temporal speckle theory, observed magnetic nano-particle movementin the process of magnetic device. Base on the analysis the intensityfluctuations and contrast in the sequential speckle graph, studied the relationof the changes of the laser speckle corresponding to the magnetic particlegathering together or excluding away.5. Presented double scanning laser speckle interferometry measuring technique,and designed the experimental parameters of the double scanning laserspeckle interferometry. Calculated the compensation relation of synchronization control to compensate transverse scan phase, and improvedthe stability and resolution of the system.6. According to the gray level in different brightness merged in the specklepattern and the interference fringes, extracted the interference fringes andspeckle from double beam scanning speckle interference patterns. Withstripe spacing for scale, made the calibration of the magnetic particle clusterin the dynamic movement.7. There is106pixels in the perpendicular separation between stripes in thesetup of the double beam-phase scanning laser speckle interferometry.Measured average speed6.93mm/s of the magnetic particle.