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Analysis Techniques of Lattice Fringe Images for Quantified Evaluation of Pyrocarbon by Chemical Vapor Infiltration

Published online by Cambridge University Press:  22 July 2014

Miaoling Li ,
Hongxia Zhao ,
Lehua Qi  and
Hejun Li
Miaoling Li
Affiliation:
Department of Mechanical Engineering, Luoyang Institute of Science and Technology, Luoyang 471023, People’s Republic of China
Hongxia Zhao
Affiliation:
Department of Mechanical Engineering, Luoyang Institute of Science and Technology, Luoyang 471023, People’s Republic of China
Lehua Qi*
Affiliation:
School of Mechatronics, Northwestern Polytechnical University, Xi’an 710072, People’s Republic of China
Hejun Li
Affiliation:
Key Laboratory of Thermostructure Composite Material, Research Institute of Carbon-Carbon Composite, Northwestern Polytechnical University, Xi’an 710072, People’s Republic of China
*
*Corresponding author. qilehua@nwpu.edu.cn
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Abstract

Some image analysis techniques are developed for simplifying lattice fringe images of deposited pyrocarbon in carbon/carbon composites by chemical vapor infiltration. They are mainly the object counting method for detecting the optimum threshold, the self-adaptive morphological filtering, the node-separation technique for breaking the aggregate fringes, and some post processing algorithms for reconstructing the fringes. The simplified fringes are the foundation for defining and extracting quantitative nanostructure parameters of pyrocarbon. The frequency filter window of a Fourier transform is defined as the circular band that retains only those fringes with interlayer distance between 0.3 and 0.45 nm. Some judge criteria are set to define topological relation between fringes. For example, the aspect ratio and area of fringes are employed to detect aggregate fringes. Fringe coaxality and distance between endpoints are used to judge the disconnected fringes. The optimum values are determined by using the iterative correction techniques. The best cut-off value for the short fringes is chosen only when there is a reasonable match between the mean fringe length and the value measured by X-ray diffraction. The adopted techniques have been verified to be feasible and to have the potential to convert the complex lattice fringe image to a set of distinct fringe structures.

Keywords

lattice fringe simplificationimage analysispyrocarbonhigh-resolution transmission electron microscopyFourier transform
Type
Instrumentation and Techniques Development
Information
Microscopy and Microanalysis , Volume 20 , Issue 5 , October 2014 , pp. 1591 - 1600
Copyright
© Microscopy Society of America 2014 

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