Beyond the partial light intensity imager: Eliminating Moire patterns

作者：Tang Yuanhe^*; Liu Qingsong; Wu Yong; Yu Yang; Yang Xusan; Gao Haiyang; Wang Xiaolin

来源：Optics Communications, 2015, 355: 143-147.

DOI：10.1016/j.optcom.2015.05.044

• Moire patterns
• Imaging
• Partial light intensity imager
• Liquid crystal

A partial light intensity imager (PLII) was proposed in our previous research for enhancing the dynamic range to 2.2 x 10(5) lx in strong light. Moire patterns may occur, however, since the PLII employs both a liquid crystal display (LCD) and a charge-coupled device (CCD) camera as its key devices, which can be regarded as two gratings. This research calculates the fringe widths and spectra for both the LCD and the CCD, and analyzes the relationship between the fringe width and the applied voltage on each pixel of the LCD. According to the theoretical results, we find that changing the rotational angle of the liquid crystal (LC) molecule by regulating the applied voltage is an effective method to eliminate the Moire patterns in the PLII. Based on this principle, an experiment has been designed, and the Moire patterns fringe width is alleviated from 20 pixels to10 pixels distance before and after, and the results verify the correctness of the theoretical analysis.

• 出版日期2015-11-15
• 单位西安理工大学