摘要
为了有效抑制高于影像传感器的采样频率而出现的莫尔条纹,研制了一种二维水晶光学低通滤波器(OL-PF)。其主要由2片双折射晶体平板和1片波片构成三明治结构,并在前、后表面分别镀上红外截止膜和增透膜。对所研制的二维水晶OLPF进行了实验测试,接触角小于20°,在可见光部分的透过率大于90%,红外部分则低于2%,空间频率测试表明对莫尔条纹有良好的抑制效果。结果表明,所研制的水晶二维OLPF具有很高的自洁净性,与后端的影像传感器匹配良好,对空间高频有较强的抑制作用,且能很好地截止红外干扰。
To restrain the high spatial frequency which is higher than the photoelectric image sensors sampling frequency, a two-dimensional crystal optical low pass filter（OLPF） is designed,fabricated and tested. Our device consists of two birefrin gence plates and a half wave plate. On the front and back surfaces of the OLPF. an antireflection film and an infrared cutting film are plated. The test results show that the antact angle is less than 20°,the transmission in the visible light range and infrared light range is above 90° and less 2° respectively, the high spatial frequency is restrained very well. These reveal that our crystal OLPF can match with the photoelectric image sensor and has a good restraining high spatial performance.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2007年第2期150-153,共4页
Journal of Optoelectronics·Laser
基金
国家"863"计划资助项目(2004AA001019)
