An optical low pass filter (OLPF) used in front of the sensor of a CCD camera was designed, according to the birefringent effect of quartz crystal and infrared cut-off optical filter.

• 摘要利用石英晶体的双折射效应和特殊红外截止滤光片设计并实现了一种日夜两用光学低通滤波器。