Polynomial curve fitting method for refraction-angle extraction in diffraction enhanced imaging

CHEN Zhi-Qiang; DING Fei; HUANG Zhi-Feng; ZHANG Li; YIN Hong-Xia; WANG Zhen-Chang; ZHU Pei-Ping

doi:10.1088/1674-1137/33/11/008

Chinese Physics C> 2009, Vol. 33> Issue(11) : 969-974 DOI: 10.1088/1674-1137/33/11/008

Polynomial curve fitting method for refraction-angle extraction in diffraction enhanced imaging

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Abstract：
X-ray diffraction enhanced imaging (DEI) is applied to inspect internal structures of weakly absorbing low-Z sample. How to extract phase information from raw images measured in different positions of rocking curve is the key problem of DEI. In this paper, we present an effective extraction method called polynomial curve fitting method, in order to extract accurate information angular in a fast speed. It is compared with the existing methods such as multiple-images statistical method and Gaussian curve fitting method. The experiments results on a plastic cylinder and a black ant at the Beijing Synchrotron Radiation Facility prove that the polynomial curve fitting method can obtain most approximate refraction-angle values and its computation speed is 10 times faster than the Gaussian curve fitting method.

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CHEN Zhi-Qiang, DING Fei, HUANG Zhi-Feng, ZHANG Li, YIN Hong-Xia, WANG Zhen-Chang and ZHU Pei-Ping. Polynomial curve fitting method for refraction-angle extraction in diffraction enhanced imaging[J]. Chinese Physics C, 2009, 33(11): 969-974. doi: 10.1088/1674-1137/33/11/008

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Received: 2008-12-17
Revised: 2009-04-03

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Polynomial curve fitting method for refraction-angle extraction in diffraction enhanced imaging

Corresponding author: HUANG Zhi-Feng,

Received Date: 2008-12-17

Accepted Date: 2009-04-03

Available Online: 2009-11-05

Abstract:

X-ray diffraction enhanced imaging (DEI) is applied to inspect internal structures of weakly absorbing low-Z sample. How to extract phase information from raw images measured in different positions of rocking curve is the key problem of DEI. In this paper, we present an effective extraction method called polynomial curve fitting method, in order to extract accurate information angular in a fast speed. It is compared with the existing methods such as multiple-images statistical method and Gaussian curve fitting method. The experiments results on a plastic cylinder and a black ant at the Beijing Synchrotron Radiation Facility prove that the polynomial curve fitting method can obtain most approximate refraction-angle values and its computation speed is 10 times faster than the Gaussian curve fitting method.

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Polynomial curve fitting method for refraction-angle extraction in diffraction enhanced imaging

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