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Proceedings Paper

In situ observation of crystal growth and concentration variation by spatial filtering method
Author(s): Ya Chen; Qun Hao; Qiudong Zhu
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Paper Abstract

A spatial filtering method was developed for in-situ observing crystal growth and concentration variation. We insert a polarizing filter between the growth chamber and objective lens for eliminating the transmitted light through the solution. The dark background introduced by polarizing filtering method is advantaged for observing the sample. Due to the birefringence property, the image of crystal is contributed by extraordinary-ray and ordinary-ray through the crystal and analyzer. Meanwhile, a high pass binary amplitude filter is inserted on the back focal plane of the objective lens for attenuating low-frequency information and transfer phase information of the object to intensity information of the image. The image intensity has become squarely related to the phase shift φ of the crystal and solution. It is possible to observe the phase object and also to inverse the image contrast and strengthen the image edge. The method has been successfully used to observe not only crystal morphology and details but also concentration field variation around the growing crystal.

Paper Details

Date Published: 10 February 2005
PDF: 8 pages
Proc. SPIE 5638, Optical Design and Testing II, (10 February 2005); doi: 10.1117/12.574566
Show Author Affiliations
Ya Chen, Beijing Institute of Technology (China)
Qun Hao, Beijing Institute of Technology (China)
Qiudong Zhu, Beijing Institute of Technology (China)

Published in SPIE Proceedings Vol. 5638:
Optical Design and Testing II
Yongtian Wang; Zhicheng Weng; Shenghua Ye; Jose M. Sasian, Editor(s)

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