Hanzhong borisun Optics explains the classification of infrared filters
The infrared filters are divided from materials, including optical glass coated, colored glass, and plastic infrared filters. This refers to near-infrared filters. If it involves mid to far infrared, materials such as Si, ZnSe, Sapphire, CaF2, quartz glass, etc.
From the perspective of optical characteristics, there are long wave pass IR long pass filter and bandpass IR bandpass filter.
(1) Made of colored glass, usually black, such as IPG-800. It absorbs visible light and allows for the transmission of infrared light. If you look at the sun through this infrared filter, you can still see a red sun. Suitable for infrared imaging.
(2) An infrared filter, such as IPGC-720, is made by vacuum deposition on optical white glass. This type of filter is also called an optical cold mirror, which reflects visible light and allows visible light to pass through. The appearance looks silver, like a mirror. If it is a medium to far infrared filter, it needs to be coated on Si, Sapphire, and quartz glass.
(3) The infrared plastic filter made of special plastic has a black appearance. If you look at the sun through this infrared filter, you can also see a red sun. The material of this plastic can be PC or PMMA.
As for band-pass type, band-pass filters are made of vacuum deposition. For near-infrared bandpass, it is coating on white glass. If it is mid to far infrared, it will be coated on Sapphire. Everyone can add. The corresponding light sources for near-infrared bandpass filters are mainly infrared IR LEDs and infrared lasers, so the main wavelengths are 808nm, 850nm, 905nm, 940nm, 1064nm, and there are also less commonly used 780nm. So the wavelengths of commonly used near-infrared filters are mainly these. The corresponding models include BPF-850, NBF-808, and BPF-940
Infrared plate, infrared filter, 850nm narrowband filter, 940nm narrowband filter, 780nm narrowband filter, 808nm narrowband filter, 905nm narrowband filter, and 980nm narrowband filter are used in door security systems. Infrared transparent acrylic plate and injection molded products are used in optoelectronic and electronic products such as cordless speakers and infrared receivers. Our products also include attenuators, gratings, spectrometers, front surface reflectors, RGB mirrors, lenses, and antireflective glass, Filter strips are used in photoelectric sensing equipment such as optical instrument, biochemical and medical instruments. Various optical coating products and infrared plates can also be customized
Translucent infrared light, shielding unwanted sunlight, not using toner dyeing, inherent translucency of the body, and good color texture effect.
