Three-Dimensional Measurement of Micro-Scale Droplet Surface&nbsp;Structure Based on Multi-View Digital Holography

ZONG Zijian; WU Yue

Vehicle Engine ›› 2024, Vol. 0 ›› Issue (4) : 71-78.

Three-Dimensional Measurement of Micro-Scale Droplet Surface Structure Based on Multi-View Digital Holography

ZONG Zijian，WU Yue

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Abstract

Digital holography is widely used in the three-dimensional structure measurement of micro-scale droplet produced by engine combustion, spray and discharge. However, traditional digital holography only obtains the approximate shape of droplet under the ellipsoidal assumption, and it is difficult to obtain the complete three-dimensional surface shape information. A new multi-angle coaxial holographic system was developed to measure the three-dimensional surface shape of millimeter-level droplets and seven cameras were used to record holograms of droplets synchronously in different directions. Through the coupling of holograms obtained in different directions, a more complete point cloud array on the object surface was obtained, and the accurate surface shape of droplet could hence be calculated. The system could accurately measure the 3D surface shape of droplet in millimeter scale, which had certain application potential in engine internal process diagnosis.

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digital holography / droplet / three-dimensional measurement / error correction

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ZONG Zijian，WU Yue. Three-Dimensional Measurement of Micro-Scale Droplet Surface Structure Based on Multi-View Digital Holography[J]. Vehicle Engine. 2024, 0(4): 71-78