中国物理B ›› 2022, Vol. 31 ›› Issue (5): 58701-058701.doi: 10.1088/1674-1056/ac3a60

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Analysis of period and visibility of dual phase grating interferometer

Jun Yang(杨君), Jian-Heng Huang(黄建衡), Yao-Hu Lei(雷耀虎), Jing-Biao Zheng(郑景标), Yu-Zheng Shan(单雨征), Da-Yu Guo(郭大育), and Jin-Chuan Guo(郭金川)   

  1. Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
  • 收稿日期:2021-09-17 修回日期:2021-11-01 出版日期:2022-05-14 发布日期:2022-04-09
  • 通讯作者: Jin-Chuan Guo,E-mail:jcguo@szu.edu.cn E-mail:jcguo@szu.edu.cn
  • 基金资助:
    This work was supported by the National Natural Science Foundation of China (Grant Nos.11674232,62075141,and 12075156) and the Foundation of Shenzhen Science and Technology Bureau,China (Grant No.20200812122925001).

Analysis of period and visibility of dual phase grating interferometer

Jun Yang(杨君), Jian-Heng Huang(黄建衡), Yao-Hu Lei(雷耀虎), Jing-Biao Zheng(郑景标), Yu-Zheng Shan(单雨征), Da-Yu Guo(郭大育), and Jin-Chuan Guo(郭金川)   

  1. Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
  • Received:2021-09-17 Revised:2021-11-01 Online:2022-05-14 Published:2022-04-09
  • Contact: Jin-Chuan Guo,E-mail:jcguo@szu.edu.cn E-mail:jcguo@szu.edu.cn
  • About author:2021-11-17
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (Grant Nos.11674232,62075141,and 12075156) and the Foundation of Shenzhen Science and Technology Bureau,China (Grant No.20200812122925001).

摘要: Dual phase grating interferometer may simultaneously achieve large field of view and high x-ray dose efficiency. Here, we develop a simple theoretical method to better understand the imaging process of the dual phase grating interferometer. The derivation process of fringe period and the optimal visibility conditions of the dual phase grating interferometer are given in detail. Then, we theoretically prove that the fringe period and optimal visibility conditions of the dual phase grating interferometer include that of the Talbot interferometer. By comparing our experimental results with those of other researchers, we find that when the positions of phase gratings are far away from the positions where the fringe visibility is optimal, the fringe period of the dual π -phase grating interferometer is twice the theoretical results under the illumination of polychromatic x-ray. This conclusion may explain the contradictory research results of dual phase grating interferometer among different researchers.

关键词: phase contrast, grating interferometer, fringe period, fringe visibility

Abstract: Dual phase grating interferometer may simultaneously achieve large field of view and high x-ray dose efficiency. Here, we develop a simple theoretical method to better understand the imaging process of the dual phase grating interferometer. The derivation process of fringe period and the optimal visibility conditions of the dual phase grating interferometer are given in detail. Then, we theoretically prove that the fringe period and optimal visibility conditions of the dual phase grating interferometer include that of the Talbot interferometer. By comparing our experimental results with those of other researchers, we find that when the positions of phase gratings are far away from the positions where the fringe visibility is optimal, the fringe period of the dual π -phase grating interferometer is twice the theoretical results under the illumination of polychromatic x-ray. This conclusion may explain the contradictory research results of dual phase grating interferometer among different researchers.

Key words: phase contrast, grating interferometer, fringe period, fringe visibility

中图分类号:  (X-ray imaging)

  • 87.59.-e
87.64.mh (Phase contrast and DIC) 07.60.Ly (Interferometers) 87.57.C- (Image quality)