用90°扭曲向列相液晶盒代替偏振片的液晶透镜成像方法  

Liquid Crystal Lens Imaging Method Using 90° Twisted Nematic Liquid Crystal Cell Instead of Polarizer

作　　者：李鹏伟 陈信慈 陈晓西 叶茂 Li Pengwei;Chen Xinci;Chen Xiaoxi;Ye Mao(School of Optoelectronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu,Sichuan 610054,China)

机构地区：[1]电子科技大学光电科学与工程学院,四川成都610054

出　　处：《光学学报》2022年第7期126-131,共6页Acta Optica Sinica

基　　金：四川省科技计划(2020YJ0327,2021YJ0102)。

摘　　要：提出了一种用90°扭曲向列相液晶盒代替偏振片的液晶透镜成像方法。液晶透镜对焦后,在90°扭曲向列相液晶盒工作于0°旋光状态和90°旋光状态时分别获取两幅图像。通过将这两幅图像相加并减去液晶透镜未工作时获得的离焦图像,减少了未调制光引入的非理想低频分量,增强了图像对比度,降低了原来无偏振片成像处理产生的噪声。实验验证了该方法的有效性,不需要任何偏振器就可以获得清晰对焦的图像。This paper presents an imaging method of a liquid crystal(LC) lens using a 90° twisted nematic LC(TNLC) cell instead of a polarizer.Two images are captured with the 90° TNLC cell in the 0° and 90° optical rotatory states.By overlapping the two images and subtracting the defocused image obtained when the LC lens is not working,we can reduce the introduction of undesired low-frequency components of non-modulated light.In this way,the contrast of the final image is enhanced,and the noise generated by the original imaging processing without a polarizer is lessened.The proposed method is verified by experiments,and the results show that clear and well-focused images can be obtained without any polarizer.

关 键 词：成像系统 液晶透镜成像 液晶盒 旋光器 

分 类 号：TN141.9[电子电信—物理电子学]