guide:

·Filters other than specifications and sizes can be provided.

reference resources:

·"Near infrared absorption filter" is also commonly known as colored glass filter.

be careful:

·The transmittance curve is the measured value of the sample and may vary with the manufacturing batch.

·During thermal strengthening treatment, the filter will expand. Please note that the overall dimension tolerance of the filter after thermal strengthening treatment is ± 0.2mm.

·When checking the optical path and adjusting the optical axis, be sure to wear laser protective glasses.

Low pass filter (OLPF) is installed in array photoelectric imaging devices (such as CCD and CMOS) In order to eliminate the interference of the object beam component higher than the sampling spatial frequency of the photoelectric imager on the imaging. Because the CCD and CMOS light sensing elements adopt the discontinuous image taking method, unnecessary noise will be generated when shooting fine lines. The optical low-pass filter chip provides the function of eliminating this noise. Due to different directions of fine lines, it is necessary to use the low-pass filter chip with corresponding angle In addition, due to some differences in specifications of different models of CCD and CMOS light sensing elements, various cutting angles (such as 45 degrees, 0 degrees and 90 degrees) are required in order to take into account the low-pass effect of different models and different directions at the same time The number, thickness and IR cut are combined into a low-pass filter chip design to remove the noise caused by shooting. When using CCD and CMOS light sensing elements to shoot color scenes, because the response of CCD and CMOS to color is different from that of human eyes, the infrared part that can be detected by light sensing elements but cannot be detected by human eyes must be removed, and the reflection of color within the visible light range must be adjusted Therefore, the color of the image should be consistent with the feeling of human eyes, so it is used by plating IR (AR) cut (interferometric) or glass (absorption) on the surface of low-pass filter wafer.