Integrated gray-level gradient method for 3D velocity fields extraction of sprays in in-line digital holography

Yan Yang; Guangyong Li; Lili Tang; Liang Huang

doi:10.1117/12.905331

15 November 2011 Integrated gray-level gradient method for 3D velocity fields extraction of sprays in in-line digital holography

Yan Yang, Guangyong Li, Lili Tang, Liang Huang

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Proceedings Volume 8321, Seventh International Symposium on Precision Engineering Measurements and Instrumentation; 83213J (2011) https://doi.org/10.1117/12.905331
Event: Seventh International Symposium on Precision Engineering Measurements and Instrumentation, 2011, Yunnan, China

Abstract

In this study, integrated gray-level gradient method, locating the best focal plane, is applied to extract the 3D velocity fields of sprays in in-line digital holography. This method consists of a conventional edge-sharpness [Es] method and a new method, namely, overall-sharpness [Os] method which is an efficient supplement of the former. The respective scopes of application of above criterions were discussed by using numerical simulation holograms of particles. And then, The integrated gray-level gradient method is proved to be an effective tool for the determination of focal plane by using the calibration target. Finally, the synchronization system is designed and assembled to record double exposure spray holograms in a short time interval. Using the integrated gray-level gradient method and some image processing techniques, the 3D coordinates of droplets are easily obtained which can be used to evaluate the 3D velocity fields of sprays. It proves that the integrated gray-level gradient method is well applied to measure the characteristics of sprays in in-line digital holography.

Citation Download Citation

Yan Yang, Guangyong Li, Lili Tang, and Liang Huang "Integrated gray-level gradient method for 3D velocity fields extraction of sprays in in-line digital holography", Proc. SPIE 8321, Seventh International Symposium on Precision Engineering Measurements and Instrumentation, 83213J (15 November 2011); https://doi.org/10.1117/12.905331

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KEYWORDS

Particles

Holograms

3D image reconstruction

Digital holography

3D image processing

Osmium

Einsteinium

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