Digital particle holographic system for measurements of spray field characteristics |
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Authors: | Yan Yang Bo-seon Kang |
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Institution: | 1. Key Laboratory of Automobile Parts and Test Techniques (Chongqing University of Technology), Ministry of Education, Chongqing, China;2. Department of Mechanical Engineering, Chonnam National University, 333 Yongbong-ro, Buk-gu, Gwangju 500-757, Korea |
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Abstract: | A digital particle holographic system for measurements of spray fields is presented. A double exposure hologram recording system with a synchronization system for time control is established, resulting in digital holograms that can be quickly recorded. To process recorded holograms, the correlation coefficient method is used for focal plane determination of particles. To remove noise and improve the quality of holograms and reconstructed images, a Wiener filter is adopted. The two-threshold and image segmentation methods are used for binary image transformation. For particle pairing, the match probability method is adopted. The proposed system is applied to a spray field, and three-dimensional velocities and sizes of spray droplets are measured. Measurement results from the digital holographic system are compared to those made by laser instruments, which prove the feasibility of the proposed in-line digital particle holographic system as a good measurement tool for spray droplets. |
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