关键词: 成像系统/
偏光干涉/
同时成像/
宽视场Savart偏光镜
English Abstract
Novel dual channel polarization interference imaging system
Wang Tian,Niu Ming-Sheng,
Bu Miao-Miao,
Han Pei-Gao,
Hao Dian-Zhong,
Yang Jing-Shun,
Song Lian-Ke
1.Shandong Provincial Key Laboratory of Laser Polarization and Information Technology, Laser Institute of Qufu Normal University, Qufu 273165, China
Fund Project:Project supported by the Key Research and Development Plan of Shandong Province, China (Grant No. 2017GSF17125) and the Qufu Normal University Introduces Talent Research Start-up Project, China (Grant No. 20130760).Received Date:29 December 2017
Accepted Date:12 March 2018
Published Online:20 May 2019
Abstract:The interference images with fixed spectral resolution can be obtained by using the existing static polarization-difference imaging system because the optical path of the system cannot be changed flexibly. However, for different detection targets, the spectral resolution of the system determined by the optical path difference must be appropriate. To satisfy a variety of application requirements, a novel dual channel polarization-difference interference imaging system (DPDⅡS), based on the lateral shear of the wide-field-of-view Savart polariscope (WSP) and the modulated Savart polariscope (MSP), is presented. The two-dimensional space images of a target and orthogonal interference images can be obtained by adjusting the MSP under different lateral displacements simultaneously. In addition, the remarkable characteristics of the system avoid spilling over rays and optimizing the system optical path effectively. In this paper, by using the Jones matrix, the system structure is demonstrated and the theoretical principle of DPDⅡS is analyzed in detail. The amplitudes of the four beams from the MSP and the interference intensity expressions of the coherent light are derived. Then the splitting characteristics of the Savart polariscope (SP) and WSP are presented. It is concluded that the WSP has better shear ability than SP and the WSP can optimize the optical path effectively compared with Wollaston prism in the DPDⅡS. The change ranges of the optical path difference and lateral displacement produced by the MSP for structure angles =/3, /4, /6 are analyzed in detail. The reconstructed orthogonal interferograms and the experimental interferograms under 632.8 nm monochromatic light for dMSP=1.00, 1.10, 1.20, 1.30 mm are obtained. A comparison between the experimental interference images and the simulated images proves that the interference fringes with different resolutions can be obtained simultaneously by adjusting the MSP. Meanwhile, the light intensities of the double optical paths are approximately equal and the same optical path difference is generated for the dual channel with the movement of MSP. The experimental results are consistent with the theoretical analyses. The spatial images of parallel and vertical components are detected under 632.8 nm polychromatic light. Then the total intensity image and the polarization-difference image are obtained through data processing. The conclusion that the polarization difference intensity image has a high resolution compared with the polarization intensity image is presented. The study has reference significance and practical value for the dual channel polarization interference imaging system.
Keywords: imaging systems/
polarized interference/
simultaneous imaging/
the wide-field-of-view Savart polariscope
