Study On Optimization Of Recording Condition In In-line Holography For Particle Field

In this dissertation, the development of laser holography recording forparticle field was overviewed. The optimum recording conditions were theoretical and experimentally studied in detail. l.This paper has theoretical studied the relationship between pulse width and the transverse velocity or lengthways velocity . The paper studied the relationship between particle diameter and resolution of holography film , size of holography film demanded by recording ,and breadth of spectrum line抯 effect on reconstruction field. From the theory and experiment , it then got the allowable range of exposure energy and finally made the result that the black density of holography film should be about 1.6 Through the theory and experiment the paper talked over the effect of gaussian distribution in beam of light on the recording and reconstruction in details. II. As an important aspect , this paper talked over the relationship between far-field number for recording and the visibility of interference fringe , and firstly found the minimum visibility of interference fringe to Tianjin 111 holography film (about 0.025) by experiment and the maximum of far-field number (about 30) for irregularity cross-section particle , in order to provide the proof to determine the distance between particle field and holography film in practice. The paper has discussed the reconstruction image recorded in small far-field number, and found that the background become so little that the disturb of background can be neglected when far-field number is above 5. Ill. For 4f system ,this paper has discussed the principle by geometry optics and wave optics , and discussed the difference between f1=f2 and 2f1f2 system in details. Through comparison these 4f system抯 ability for information the paper found that the best position for particle field in 2f1f2 system is some point after first lens. And more, it also analysed system抯 recording visibility and reconstructed image with different amplificatory in details . Found that the hologram visibility using 1:1 4f system was less than using amplificatory 4f system and the depth of field was longer after using amplificatory 4f system . After using amplificatory 4f system this paper predicated the black density of holography film decreases and the amplitude transmission increases. IV. This paper takes the circular cross-section particle as example , and deduced 2 the reconstructed field when the holography film records different side lobes in theory. It has predicted the reconstructed field in theory . and gotten those result from experiment . It finds that the focal plane just is that plane with the maximum contrast in the edge of reconstructed image . The recording ability can be judge from the intensity distribution on the focal plane .So this paper provides the quantitative method to improving developing procedure technical...