Optical Low Pass Filter(OLPF)
Product description:
    Optical low pass filter (OLPF) is a combined filter, which is the key part of the digital cameras and the CCTV optical systems. OLPF is consists of one or more pieces of crystal (such as 45°¢0°, 1/4 wavelength plate) and blue glass. Crystal can decrease Moire fringes (which can cut off high sampling frequency of the imager in spatial domain) and the blue glass can improve color shading and uniformity.
  • Technical index

Typical spectral characteristics (for reference):

1. With blue glass

UVIR

Wavelength

Transmission

350-395nm

Tave<3%

415±10nm

T=50%

430-565nm

Tave>93%,Tmin>85%

639±10nm

T=50%

725-1200nm

Tmax<3%










2. Without blue glass

UVIR

Wavelength

Transmission

350-375nm

Tave<3%

420±10nm

T=50%

440-450nm

Tave>90%,Tmin>85%

450-620nm

Tave>92%,Tmin>87%

650±10nm

T=50%

700-720nm

Tave<2%,Tmax<2.5%

720-880nm

Tave<1%,Tmax<2%

880-900nm

Tave<2%,Tmax<3%

900-1100nm

Tave<3.5%


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