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포스터 전시회 : MR 유체 입자유동가시화를 위한 디지털 홀로그래피 현미경 시스템
진학붕 ( Hepeng Chen ),강보선 ( Bo-seon Kang ) 한국액체미립화학회 2015 한국액체미립화학회 학술강연회 논문집 Vol.2015 No.-
Nowadays, digital holography(DH) has become a useful approach to measure flow fields because it can instantaneously record three-dimensional information of flow fields. It has several advantages including high efficiency, simplicity and real-time analysis etc. However, due to the limited resolution of CCD sensor, digital holography sometimes cannot satisfy the needs of research with very small length scales. Therefore, a magnification lens is necessary to be added into digital holographic configuration. This new setup can be applied in a new application field, which is called digital holographic microscopy(DHM). It combines the benefits of DH and optical microscope imaging, which is quite suitable for particle imaging velocimetry. In this study, a digital holographic microscopic system for visualization of particle flow field in magnetorheological(MR) fluids is demonstrated. An in-line digital holographic microscopy configuration was adopted to measure particle movement in MR fluids, so that high resolution of particle velocity measurements can be obtained. In addition, development of image processing algorithms is another significant part of this research. The correlation coefficient method was utilized in order to locate the exact focal plane of particles. For the sake of improving the quality of holograms and reconstructed images, the Wiener filter was applied. To obtain good binary images of particles, the two-threshold and image segmentation methods were employed.
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