Development of a Novel Three-Dimensional Micro Particle Tracking Velocimetry Based on Bessel Beam Images

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基本資料

Project title

Code/計畫編號

MOST105-2633-E019-001

Translated Name/計畫中文名

發展以Bessel光束影像為基礎之新式三維微粒子追蹤測速技術

Project Coordinator/計畫主持人

Jyh-Jong Sheen

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Mechanical and Mechatronic Engineering

Website

https://www.grb.gov.tw/search/planDetail?id=11921453

Year

2016

Start date/計畫起

01-08-2016

Expected Completion/計畫迄

01-07-2017

Bugetid/研究經費

787千元

ResearchField/研究領域

機械工程

"由於微機電系統(micro-electromechanical systems)技術的蓬勃發展，微流體技術已廣泛應用於不同的微流體裝置，譬如微全分析系統(micro total analysis system)、實驗室晶片 (Lab-on-a-chip)、以及微流體邏輯元件等。這些微流體裝置包含各種不同的微流道，而如何量測三維微流場，以提供流道最佳化設計的參考依據，則扮演關鍵的因素。 2013 年著名的PIV (particle image velocimetry)學者S. Wereley 與C. Snoeyink 發表了以干涉影像為基礎的粒子追蹤測速法(interference particle tracking velocimetry, interference-PTV)，他們在顯微鏡與相機的光路中加入軸稜錐(axicon)。由於螢光粒子的激發光經過軸稜錐會形成 Bessel 光束，其粒子成像之干涉亮紋半徑會與粒子在流場深度呈現線性關係，且影像離焦平面 100 m 以上還能保持其干涉圈數影像變化，使流場垂直測量範圍比其他方法大很多。本研究提出以顯微鏡離軸(off-axis)照明方式，使得粒子的反射光形成一微小的環形光源，類似於J. Durnin 提出以環縫透鏡法產生Bessel 光束的架構。實驗證實本系統遠離焦平面的粒子影像具有Bessel 光束之干涉圖形，而且粒子干涉影像品質較Wereley 的系統為佳，這是文獻上尚未提出的以干涉影像為基礎的粒子追蹤測速架構。本研究希望能藉由以離軸照明的 micro-PTV 創意，提出可行的以干涉影像為基礎的三維微粒子追蹤測速系統，進而推導本系統的光學理論，提升micro-PTV 的量測性能的同時，也達到架設簡易、實驗資料處理方便的目的。" "Due to advances in micro-electromechanical systems technology, microfluidic technology has had wide applications in various microfluidic devices such as micro total analysis systems, Lab-on-a-chip and microfluidic logic devices. These devices have various kinds of microchannels. Therefore, how to measure the three-dimensional micro flow field for their optimum design is truly essential. In 2013, well-known PIV (particle image velocimetry) researchers S. Wereley and C. Snoeyink proposed a novel micro particle tracking velocimetry (PTV) based on particle interference pattern and it was named interference-PTV. They used an axicon to produce Bessel beam from fluorescent tracking particles. They found that the depth of the particle is linearly proportional to the diameter of the outermost interference fringe. The measurable depth range was over 100 m, which was greater the most exiting PTVs. We propose another novel interference-PTV system by using off-axis illumination of a microscope. The effect of the obliquely illuminated particle is similar to the point light source from the annular slit, which is essential in J. Durnin’s original optic setup to produce the Bessel beam. We have recently verified that our system indeed produced particle interference patterns and is image quality is better than Wereley’s interference image. By this innovation, we propose a feasible interference-PTV system and would to further investigate this system in order to improve the performance as well as to achieve a simple experimental setup and easy post-processing of image data."

DSpace CRIS

Development of a Novel Three-Dimensional Micro Particle Tracking Velocimetry Based on Bessel Beam Images

基本資料

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