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MICROPARTICLE CHARACTERIZATION USING

DIGITAL HOLOGRAPHY

By Pranit P. Malgaonkar

Guided By – Prof. Nitin Satao

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CONTENT1) Micro particle Characterization & methods of particle characterization

2)Introduction to digital holography

3)Holography and hologram

4)Digital in line holographic microscopy

5)Digital hologram processing for particle measurement

6)Advantage

7)Conclusion

8)References

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Micro particle Characterization & methods of particle characterization

particle size, particle shape, and surface area analysis of any particle larger than 1 micron, but smaller than 1 mm should be called a micro particle Characterization

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INTRODUCTION TO DIGITAL HOLOGRAPHY

Digital holography :- Digital holography is an effective 3D technique with the potential to be used for measurements of the position , size distribution , and speed of particles or other micro objects suspended in fluid

Digital holography provides 3D volume information from a single hologram acquisition. The actual location of particle can be determined subsequently by reconstructing the recorded hologram at different depths.

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HOLOGRAPHY AND HOLOGRAMS

Holography is a photographic technique that records the light scattered from an object, and then presents it in a way that appears three-dimensional.

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Digital in line holographic microscopy

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Digital hologram processing for particle measurement

Steps of hologram processing algorithm :-

a) Numerical reconstruction

b) Image segmentation

c) Localization of a particle

d) Particle size and shape measurements

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ADVANTAGE

In comparison with classical film based holography the use of digital holography is more attractive due to the ease of set up and recording process using digital camera

It is possible to experiment a phenomena during a long time without modification of the setup and to compensate numerically for specimen movements afterwards

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CONCLUSIONS

A particle size measurement methodology based on digital holographic microscopy was presented. The size and shape measurements obtained using digital holography microscopy show good agreement with the given size and shape measured using independent techniques the results obtained in this study extend the potential of digital holography for applications in particle characterization

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REFERENCES

MICROPARTICLE CHARACTERIZATION USING DIGITAL HOLOGRAPHIC MICROSCOPYEmmanouil Darakis,Taslima khanam , Arvind rajendran, Vinay kariwala, Thomas j. naughton , Anand k. asundi Chemical Engineering science 65(2010)1037-1044www.elsevier.com/locate/ces

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THANK YOU