Infrared filters are mainly used in the field of security monitoring, infrared gas analyzer, night vision products, infrared detectors, infrared receivers, infrared induction, infrared communication products. Specific to products such as: surveillance cameras, remote controllers, infrared curtain wall products, infrared induction toilets, faucets, hand washing liquid devices, infrared thermometers, infrared printers, interactive electronic whiteboard, infrared touch screen, fingerprint recognition machine, face recognition system, etc.
The infrared band includes a wide range of wavelengths ranging from 780nm to 14um, including near infrared, mid-infrared and far-infrared. Near infrared (code IR-A, wavelength 780-1500 nm, NIR), mid-infrared (IR-B, 1500-6000 nm, MIR) and far infrared (IR-C, 6000-14000 nm, FIR) bands.
From the material division, there are optical glass coating, also made of colored glass, there are plastic infrared filters. This refers to near infrared filters. When it comes to mid-far infrared, the materials include Si, ZnSe, Sapphire, CaF2, quartz glass, etc.
According to the optical characteristics, there are long wave pass filter and bandpass filter.
Among them, the long wave pass type.
(1) Colored glass, usually black, such as IPG-800. It absorbs visible light, allowing it to pass through infrared light. If you look at the sun through this infrared filter, you can still see a red sun. It is suitable for infrared imaging.
(2) Infrared filters, such as IPGC-720, are made on optical white glass by vacuum coating. This type of optical cold mirror reflects the visible light and allows the visible light to pass through. It looks silver, like a mirror. If it is a medium and far infrared filter, it should be coated on Si, Sapphire and quartz glass.
(3) Infrared plastic filters made of special plastics have black appearance. If you look at the sun through this infrared filter, you can also see a red sun. This plastic material can be either PC or PMMA.
In addition, band-pass filters are made of vacuum coating. For near infrared bandpass, it is coated on white glass. If it is mid-far infrared, it will be coated on Sapphire. You can add. Near infrared bandpass filters are mainly illuminated by infrared infrared LED and infrared laser, so the main wavelength is 808 nm, 850 nm, 905 nm, 940 nm, 1064 nm, and 780 nm, which is not commonly used. So these are the main wavelengths of the commonly used near infrared filters. The corresponding models are BPF-850, NBF-808 and BPF-940.