吸收型有色玻璃滤光片(color glass filter)

作用：为避免由红外光引起的虚像及图像颜色失真，其最有效的方法过滤滤除除可见光以外的紫外&红外光，还原人眼所看到的真实颜色，从而解决图像色彩失真的问题。

Function: To avoid virtual images and color distortion caused by infrared light, its most effective method is to filter out ultraviolet and infrared light other than visible light, restore the true color seen by the human eye, and thus solve the problem of image color distortion.
特点：吸收型滤光片与其它的滤光片（IR-CUT Coating,反射式)的不同点在于玻璃基质本身其作用是通过“吸收”过滤红外光线，没有发生红外光线的反射现象，以减少成像中发生例如"诡影"在内的成像异常。

Characteristics: The difference between absorption type filters and other filters (IR-CUT Coating, reflective) is that the glass substrate itself filters infrared light by "absorbing" it, without any reflection of infrared light, in order to reduce imaging abnormalities such as "ghosting" inside.

截止特性(cut-off characteristic)：

 1)可截止700~1100nm近红外线，透过400~700nm可见光(如：蓝玻璃)

Capable of cutting off near-infrared light at 700-1100nm and transmitting visible light at 400-700nm(Blue Glass)

2)可截止400~700nm可见光，透过700~1100nm近红外线(如:HWB黑玻璃)

Can cut off visible light at 400-700nm and transmit near-infrared light at 700-1100nm(HWB Black Glass)

3)也可截止400~任意nm的可见光，透过相应nm至1100nm部份光线

It can also cut off visible light from 400 to any nm and transmit light from the corresponding nm to 1100nm

HWB黑玻璃滤光片（HWB Black Glass Filter）:

IR Pass Filter 近红外线透过滤光片（可供所有需夜视成像系统的设备)：

IR Pass Filter(longpass Filter) Near Infrared Transmitting Filter (available for all devices requiring night vision imaging systems):

常见HWB黑玻璃滤光片光谱(Common HWB Black Glass Filter Spectra)：

吸收式红外线滤光片（蓝玻璃,Blue Glass Filter）:

蓝玻璃本身是一种磷酸盐玻璃，里面掺杂着各种离子（如Cu 离子），这些离子可以吸收人眼看不见的红外光，在某些光源场景下,蓝玻璃能更有效消除眩光诡影，使摄像头成像接近人眼

Blue glass itself is a type of phosphate glass doped with various ions (such as Cu ions), which can absorb infrared light that is invisible to the human eye. In certain light source scenarios, blue glass can more effectively eliminate glare and ghosting, making the camera image closer to the human eye

使用蓝玻璃滤光片与白玻璃（反射式红外截止）的区别：

The difference between using blue glass filter and white glass (reflective infrared cut-off):

诡影是如何产生(How Ghost and Flare are Generated)：

  当光线穿过反射式（IR-Cut Filter）滤光片来到CCD&CMOS表面时，由于CCD&CMOS 每个像素上都有用于收集光线的感光像素点，入射光线在感光像素点上会有一定的反射和漫射，将光线反射回滤光片，然后滤光片又将光线进行二次反射回感光像素点，如此多次的反射和漫射，造成有一部份杂散光最后也到达了像平面，使图像的衬度降低，从而影响了系统的成像质量，其中便有眩光或诡影的产生。而蓝玻璃滤光片能将进入的反射光线吸收掉，减少反复反射的红光线，从而改善眩光及诡影现象.

      When light passes through an IR Cut Filter and reaches the surface of a CCD&CMOS, due to the presence of photosensitive pixels on each pixel of the CCD&CMOS for collecting light, the incident light will have a certain degree of reflection and diffusion on the photosensitive pixels. The light will be reflected back to the filter, and then the filter will reflect the light back to the photosensitive pixels for a second time. Such multiple reflections and diffusion cause some stray light to eventually reach the image plane, reducing the contrast of the image and affecting the imaging quality of the system, resulting in glare or ghosting. The blue glass filter can absorb the incoming reflected light, reduce the repeated reflection of red light, and thus improve glare and ghosting phenomena.

常见蓝玻璃滤光片光谱(Common Blue Glass Filter Spectra)：

红,蓝,绿各种滤色片(Red, blue, green various color filters):