Measuring the deformation of an impinging drop on a solid plate

碩士 === 國立臺灣大學 === 機械工程學研究所 === 107 === The perturbation caused by external influences on the surface of liquids has been receiving constant attention from scientists and engineering. In this study, we will measure the contour of an impinging drop on a solid surface. Generally, the main methods for m...

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Main Authors: Jie-An Chang, 張介安
Other Authors: 張鈞棣
Format: Others
Language:zh-TW
Published: 2019
Online Access:http://ndltd.ncl.edu.tw/handle/4a5pr2
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spelling ndltd-TW-107NTU054891162019-11-16T05:28:00Z http://ndltd.ncl.edu.tw/handle/4a5pr2 Measuring the deformation of an impinging drop on a solid plate 量測液滴撞擊至平板的變形 Jie-An Chang 張介安 碩士 國立臺灣大學 機械工程學研究所 107 The perturbation caused by external influences on the surface of liquids has been receiving constant attention from scientists and engineering. In this study, we will measure the contour of an impinging drop on a solid surface. Generally, the main methods for measuring three-dimensional shape of an object are divided into contact and non-contact measurement. The fluid is deformed by external force. Therefore, in order to measure the contour of the fluid, a non-contact measurement system must be used to measure without disturbing the fluid. In this study, an optical measurement system was built and used with Fourier Transform Profilometry (FTP) to measure the deformation of an impinging droplet on a solid surface. We use the projector to project fringe patterns onto the droplets, and record the image by using high speed camera at different timing. After the operation of Fourier transform, the wrapped phase of each pixel can be obtained. By utilizing phase unwrapping, the original phase is also obtained. The original phase differences can be converted into height by optical geometry, and the surface of the droplet can be further determined. In addition, we built a simulation system to find the best reconstruction parameters by adjusting different parameters, such as the fringe frequency, the bandwidth or the reflectivity. Finally, We discuss the pros and cons of the reconstruction results by using FTP. By the simulation, we found that the reconstruction result is better as the fringe frequency increases. When the fringe frequency is so high that our device cannot distinguish the fringe, which will increase the reconstruction error. The reconstruction result is the best when the reflectivity of object and reference plane is equal. We learned from experiment that the reconstruction result is worse with the increase of the object slope, and the reconstruction result is better when the object height is increases. 張鈞棣 2019 學位論文 ; thesis 63 zh-TW
collection NDLTD
language zh-TW
format Others
sources NDLTD
description 碩士 === 國立臺灣大學 === 機械工程學研究所 === 107 === The perturbation caused by external influences on the surface of liquids has been receiving constant attention from scientists and engineering. In this study, we will measure the contour of an impinging drop on a solid surface. Generally, the main methods for measuring three-dimensional shape of an object are divided into contact and non-contact measurement. The fluid is deformed by external force. Therefore, in order to measure the contour of the fluid, a non-contact measurement system must be used to measure without disturbing the fluid. In this study, an optical measurement system was built and used with Fourier Transform Profilometry (FTP) to measure the deformation of an impinging droplet on a solid surface. We use the projector to project fringe patterns onto the droplets, and record the image by using high speed camera at different timing. After the operation of Fourier transform, the wrapped phase of each pixel can be obtained. By utilizing phase unwrapping, the original phase is also obtained. The original phase differences can be converted into height by optical geometry, and the surface of the droplet can be further determined. In addition, we built a simulation system to find the best reconstruction parameters by adjusting different parameters, such as the fringe frequency, the bandwidth or the reflectivity. Finally, We discuss the pros and cons of the reconstruction results by using FTP. By the simulation, we found that the reconstruction result is better as the fringe frequency increases. When the fringe frequency is so high that our device cannot distinguish the fringe, which will increase the reconstruction error. The reconstruction result is the best when the reflectivity of object and reference plane is equal. We learned from experiment that the reconstruction result is worse with the increase of the object slope, and the reconstruction result is better when the object height is increases.
author2 張鈞棣
author_facet 張鈞棣
Jie-An Chang
張介安
author Jie-An Chang
張介安
spellingShingle Jie-An Chang
張介安
Measuring the deformation of an impinging drop on a solid plate
author_sort Jie-An Chang
title Measuring the deformation of an impinging drop on a solid plate
title_short Measuring the deformation of an impinging drop on a solid plate
title_full Measuring the deformation of an impinging drop on a solid plate
title_fullStr Measuring the deformation of an impinging drop on a solid plate
title_full_unstemmed Measuring the deformation of an impinging drop on a solid plate
title_sort measuring the deformation of an impinging drop on a solid plate
publishDate 2019
url http://ndltd.ncl.edu.tw/handle/4a5pr2
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