Selected area electron diffraction spectrum and image processing method for determining preferred orientation degree of pyrolytic carbon

Abstract

The invention discloses a selected area electron diffraction pattern and image processing method for determining preferred orientation degree of pyrolytic carbon. The method comprises the following steps that binarization processing is performed on an original pattern, a diffraction ring and an inner area of the diffraction ring, a brightness value of which is greater than or equal to 50, is selected, and marginalized processing is performed; bright area boundaries are determined, a least square method is used for fitting a center of a circle and a radius, and an approximate center of the circle and an approximate radius of the diffraction ring are obtained; according to the approximate center of the circle and the approximate radius, a small radius of a circular area is 0.7 times the approximate radius, and a large radius of the circular area is 1.2 times the approximate radius; an inner area and an outer area of the diffraction ring are deducted, then the binarization processing is performed again, a part, the brightness value of which is greater than or equal to 145, is selected from the circular area, i.e. the diffraction ring; and according to the least square method, the center of the circle and the radius of the diffraction ring are fitted again, pattern sampling points are determined, and a strength-azimuth curve is obtained to determine the preferred orientation degree of the pyrolytic carbon. By using the method, the strength-azimuth curve of a pyrolytic carbon coating can be simply, conveniently and accurately obtained, so as to determine the preferred orientation degree of the pyrolytic carbon.

Description

technical field [0001] The invention relates to a selected area electron diffraction spectrum image processing method for determining the preferred orientation degree of pyrolytic carbon, in particular to a selected area electron diffraction spectrum image processing method for determining the preferred orientation degree of an artificial heart valve silicon-containing pyrolytic carbon coating. Background technique [0002] Pyrolytic carbon coatings prepared by fluidized-bed chemical vapor deposition (CVD) are prone to preferential orientation during deposition. The preferred orientation is related to the deposition process and deposition conditions, and also affects the structure and properties of the pyrolytic carbon coating. By preparing pyrolytic carbon with different preferred orientations, different material performance requirements can be met. For artificial heart valve pyrolytic carbon coatings, it is required to be high-density isotropic pyrolytic carbon. Theref...

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Problems solved by technology

[0004] In the past X-ray diffraction experiments, the diffraction rings were picked up by the film, and the diffraction intensity could only be measured point by point manually. Measuring just got easier

However, due to the lack of research on pyrolytic carbon materials at home and abroad, there are even fewer studies on the preferred orientation angle of pyrolytic carbon. As a result, there is currently no professional tool for determining the orientation angle, and some foreign authors use customized software to measure Orientation angle

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