Abstract
The gray of two images of a same particle taken by a digital camera with different exposure times is different too. Based on the gray difference of particle images in a double-exposed photo and ai]tocorrelation processing of digital images, this paper proposes a method for measuring particle velocities and sizes simultaneously. This paper also introduces the theoretical foundation of this method, the process of particle imaging and image processing, and the simultaneous measurement of velocity and size of a low speed flow field with 35 μm and 75 μm standard particles. The graphical measurement results can really reflect the flow characteristics of the flow field. In addition, although the measured velocity and size histograms of these two kinds of standard particles are slightly wider than the theoretical ones, they are all still similar to the normal distribution, and the peak velocities and diameters of the histograms are consistent with the defai]lt values. Therefore, this measurement method is capable of providing moderate measurement accuracy, and it can be further developed for high-speed flow field measurements.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Kosaka H, Won Y H, Kamimoto T. A study of the structure of diesel sprays using 2-D imaging techniques. SAE Paper 920107, 1992
Yule A J, Akhtar P, Shrimpton J S. PDA measurements of fuel effects on atomization and spray structures from a diesel engine injector. SAE Paper 982544, 1998
Trolinger J D, Belz R A, Farmer W M. Holographic techniques for the study of dynamic particle fields. Appl Opt, 1969, 8(5): 957–961
Raffel M, Willert C, Kompenhans J. Particle Image Velocimetry. Berlin Heidelberg: Spring-Verlag, 1998
Glover A R, Skippon S M, Boyle R D. Interferometric laser imaging for droplet sizing: a method for droplet-size measurement in sparse spray systems. Appl Opt, 1995, 34(36): 8409–8421
Maeda M, Kawaguchi T, Hishida K. Novel interferometric measurement of size and velocity distributions of spherical particles in fluid flows. Meas Sci Technol, 2000, 11(12): 13–18
Mielke A F, Wernet M P, Kadambi J R. Approach for particle sizing using DPIV. Proc SPIE, 2000, 4076: 36–46
Pan G, Shakal J, Lai W, et al. Simultaneous global size and velocity measurements of droplets and sprays. Proc ILASS, 2005. 91-96
Wu Z J, Huang Z, Hao L J. An image shifting technique based on gray-scale classification for particle image velocimetry. Opt Lasers Eng, 2002, 38(6): 235–243
Huang C J, Wu Z J, Li Z L, et al. Principle of particle velocity and size measurement and its experimental validation. J JiLin Univ (Eng Technoly Ed), 2010, 40(4): 1106–1111
Hulst V D. Light Scattering by Small Particle. London: Chapman and Hall, 1957
Tian Z S, Wu Z J. Development of an imaging system of the particle image velocimetry and sizer (PIVS) based on acousto-optic modulation. Appl Laser, 2005, 25(6): 390–394
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Huang, C., Wu, Z., Li, Z. et al. Simultaneous measurement of particle velocity and size based on gray difference and ai]tocorrelation. Sci. China Technol. Sci. 53, 2833–2838 (2010). https://doi.org/10.1007/s11431-010-4090-5
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11431-010-4090-5