Journal of Mechanical Science and Technology

, Volume 23, Issue 6, pp 1670–1679

Measurements of the characteristics of spray droplets using in-line digital particle holography



In-line digital particle holography is applied to measure the characteristics of spray droplets. Common reconstruction methods were considered and the best one was selected. Several important parameters at the time of hologram recording, such as the object distance and the region of laser beam used, are discussed. The feasibility of the correlation coefficient (CC) method for focal plane determination of 3-D droplets was verified. A double exposure hologram recording system with synchronization system for time control was established, and two digital spray holograms were obtained in a short time interval. For post-processing of reconstruction images, the two-threshold and the image segmentation methods were used in binary image transformation. Using the CC method and some image processing techniques applied to droplets in each double exposure image, the spatial positions of droplets used to evaluate the three dimensional droplet velocities were easily located, which proved the feasibility of in-line digital particle holographic technology as a good measurement tool for spray droplets.


Digital particle Holography Spray droplets Correlation coefficient method 


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  1. [1]
    U. Schnars and W. Jueptner, Digital Holography, Springer, Berlin, Germany, (2005).Google Scholar
  2. [2]
    M. Jaquot, P. Sandoz and G. Tribilon, High resolution digital holography, Optics Communications. 190(1) (2001) 87–94.CrossRefGoogle Scholar
  3. [3]
    S. Lai, B. Kemper and G. V. Bally, Off-axis reconstruction of in-line holograms for twin-image elimination. Optics Communications. 169(1) (1999) 37–43.CrossRefGoogle Scholar
  4. [4]
    H. Wang, D. Wang, J. Xie and S. Tao, Recording conditions of digital holography, Proc. of International Congress on High-Speed Photography and Photonics, SPIE, Bellingham, WA, USA. (2007) 62791J-1∼10.Google Scholar
  5. [5]
    J. Kim, J. Chu and S. Lee, Improvement of pattern recognition algorithm for drop size measurement, Atomization and Sprays. 9(3) (1999) 313–329.Google Scholar
  6. [6]
    K. J. Hay, Z. C. Liu and T. J. Hanratty, A backlighted imaging technique for particle size measurement in two-phase flows, Experiments in Fluids. 25(3) (1998) 226–232.CrossRefGoogle Scholar
  7. [7]
    L. Yu and L. Cai, Iterative algorithm with a constraint condition for numerical reconstruction of three-dimensional object from its hologram, J. Opt. Soc. Am. A. 18(5) (2001) 1033–1045.CrossRefGoogle Scholar
  8. [8]
    F. Dubois, C. Schockaert, N. Callens and C. Yourassowsky, Focus plane detection criteria in digital holography microscopy by amplitude analysis, Opt. Express. 14(13) (2006) 5895–5980.CrossRefGoogle Scholar
  9. [9]
    C. B. Lefebvre, S. Coetmellec, D. Lebrun and C. Ozkul, Application of wavelet transform to hologram analysis: three-dimensional location of particles, Opt. Laser Eng. 33(6) (2000) 409–421.CrossRefGoogle Scholar
  10. [10]
    Y. Zhang, D. X. Zheng, J. L. Shen and C. L. Zhang, 3D locations of the object directly from inline holograms using the Gabor transform, Proc. of Holography, Diffractive Optics, and Applications II, SPIE, Bellingham, WA, USA. (5636) (2005) 116–120.Google Scholar
  11. [11]
    Y. Yang, B. S. Kang and Y. J. Choo, Application of the correlation coefficient method for determination of the focal plane to digital particle holography, Applied Optics. 47(6) (2008) 817–824.CrossRefGoogle Scholar
  12. [12]
    Y. J. Choo and B. S. Kang, The characteristics of the particle position along an optical axis in particle holography, Meas. Sci. Technol. 17(4) (2006) 761–770.CrossRefGoogle Scholar
  13. [13]
    A. Macovsk, Spatial and temporal analysis of scanned systems, Applied Optics. 9(8) (1970) 1906–1910.Google Scholar
  14. [14]
    S. J. Baek and S. J. Lee, A new two-frame particle tracking algorithm using match probability, Experiments in Fluids. 22(1) (1996) 23–30.CrossRefGoogle Scholar
  15. [15]
    The Expression of Uncertainty and Confidence in Measurement, United Kingdom Accreditation Service, M 3003, Edition 2, (2007) 16–36.Google Scholar

Copyright information

© The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  1. 1.Key Lab. of Automobile Parts & Test Technique of Ministry of EducationChongqing University of TechnologyChongqingChina
  2. 2.Dept. of Mechanical Systems EngineeringChonnam National Univ.ChonnamKorea

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