Multidimensional position and displacement estimation using periodic coded optical apertures in a single-camera imaging system

IF 2.3 3区 工程技术 Q2 ENGINEERING, MECHANICAL
Tino Steinmetz, Jonas Otto, Hermann Pommerenke, Johannes Otto, André Kleinwächter, Eric Ebert, Nils Damaschke
{"title":"Multidimensional position and displacement estimation using periodic coded optical apertures in a single-camera imaging system","authors":"Tino Steinmetz,&nbsp;Jonas Otto,&nbsp;Hermann Pommerenke,&nbsp;Johannes Otto,&nbsp;André Kleinwächter,&nbsp;Eric Ebert,&nbsp;Nils Damaschke","doi":"10.1007/s00348-025-03988-0","DOIUrl":null,"url":null,"abstract":"<div><p>Accurately estimating multidimensional positions and displacements in fluid dynamic experiments is essential for understanding complex flow phenomena. This paper presents a novel optical measurement setup capable of determining velocity fields using periodic coded optical apertures in a single-camera imaging system. Our method involves placing a periodic transmission grating in front of the optical system and aligning a laser beam along the system’s optical axis. When particles intersect the laser beam, they scatter light, producing out-of-focus images on the imaging sensor resembling the periodic grating. The size and position of these images vary with the distance to the imaging system and the offset from the optical axis, allowing for accurate determination of particle positions. We derive mathematical formulas describing the imaging system and the relationship between image properties and particle positions and verify them through simulations. Additionally, we develop a calibration method enabling arbitrary optical imaging systems to be used with this technique. Finally, we demonstrate the effectiveness of our approach by measuring velocity fields near a ducted ship propeller, a practical application that underscores the real-world impact of our research in fluid dynamics.</p></div>","PeriodicalId":554,"journal":{"name":"Experiments in Fluids","volume":"66 3","pages":""},"PeriodicalIF":2.3000,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00348-025-03988-0.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Experiments in Fluids","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s00348-025-03988-0","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
引用次数: 0

Abstract

Accurately estimating multidimensional positions and displacements in fluid dynamic experiments is essential for understanding complex flow phenomena. This paper presents a novel optical measurement setup capable of determining velocity fields using periodic coded optical apertures in a single-camera imaging system. Our method involves placing a periodic transmission grating in front of the optical system and aligning a laser beam along the system’s optical axis. When particles intersect the laser beam, they scatter light, producing out-of-focus images on the imaging sensor resembling the periodic grating. The size and position of these images vary with the distance to the imaging system and the offset from the optical axis, allowing for accurate determination of particle positions. We derive mathematical formulas describing the imaging system and the relationship between image properties and particle positions and verify them through simulations. Additionally, we develop a calibration method enabling arbitrary optical imaging systems to be used with this technique. Finally, we demonstrate the effectiveness of our approach by measuring velocity fields near a ducted ship propeller, a practical application that underscores the real-world impact of our research in fluid dynamics.

单相机成像系统中使用周期编码光学孔径的多维位置和位移估计
准确估计流体动力学实验中的多维位置和位移对于理解复杂的流动现象至关重要。本文提出了一种新的光学测量装置,能够在单相机成像系统中使用周期编码光学孔径来确定速度场。我们的方法包括在光学系统前面放置一个周期传输光栅,并沿着系统的光轴对准激光束。当粒子与激光束相交时,它们散射光,在类似于周期光栅的成像传感器上产生失焦图像。这些图像的大小和位置随着与成像系统的距离和与光轴的偏移量而变化,从而可以准确地确定粒子的位置。我们推导了描述成像系统和图像属性与粒子位置之间关系的数学公式,并通过仿真验证了这些公式。此外,我们开发了一种校准方法,使任意光学成像系统能够与该技术一起使用。最后,我们通过测量导管船舶螺旋桨附近的速度场来证明我们方法的有效性,这是一个实际应用,强调了我们在流体动力学研究中的现实影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
Experiments in Fluids
Experiments in Fluids 工程技术-工程:机械
CiteScore
5.10
自引率
12.50%
发文量
157
审稿时长
3.8 months
期刊介绍: Experiments in Fluids examines the advancement, extension, and improvement of new techniques of flow measurement. The journal also publishes contributions that employ existing experimental techniques to gain an understanding of the underlying flow physics in the areas of turbulence, aerodynamics, hydrodynamics, convective heat transfer, combustion, turbomachinery, multi-phase flows, and chemical, biological and geological flows. In addition, readers will find papers that report on investigations combining experimental and analytical/numerical approaches.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信