摘要
数字全息技术在发动机燃烧、喷雾、排放中产生的微尺度液滴的三维结构测量中有着广泛的应用，但是过去的数字全息技术仅能获得椭球形假设下的液滴大致形状，难以获得完整的三维表面形状信息。针对毫米级液滴的三维表面形状开展测量，开发了一种新型的多角度共轴全息系统，使用7台相机从不同方向上同步拍摄毫米级液滴的全息图，通过将不同方向上获得的全息图耦合，获得较为完整的物体表面点云阵列，从而得到较精确的物体表面形状。该系统可以较为准确地测量毫米级物体的三维表面形状，在发动机内部过程诊断工作中有一定应用潜力。
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.
关键词
数字全息 /
液滴 /
三维测量技术 /
误差修正
Key words
digital holography /
droplet /
three-dimensional measurement /
error correction
宗子建，伍岳.
基于多视角数字全息的微尺度液滴表面结构三维测量研究[J]. 车用发动机. 2024, 0(4): 71-78
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
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