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Optical filters are everywhere in our life, from precision and optical equipment, display equipment to optical film applications in daily life;

For example, glasses, digital cameras, all kinds of home appliances, infrared sensing equipment, driving cars are the embodiment of optical film technology application products.

Filter products are mainly classified by spectral band, spectral characteristics, film material, application characteristics and so on.

Principle of optical filter:

The filter is made of glass and added with special dyes. The color filter can only let red light through, and so on. Glass used to transmit about the same as air.

All color light can pass through, so it is transparent, but after dyeing the dye, the molecular structure changes, the refractive index also changes, and the passage of some color light has changed. than

Such as a beam of white light through the blue filter, emitted is a beam of blue light, and green light, red light is very little, most of the filter was absorbed.

Features of filter:

Its main feature is that the size can be made quite large. Thin film filter, through a longer wavelength, more used as infrared filter. The latter is in a certain base, the air - free coating method alternates

The formation of a metal dielectric metal film with a high or low refractive index of a fixed thickness, or an all-dielectric film, constitutes a low-level, multi-stage series solid Fabry - Perot interference

Instrument. The material, thickness and series mode of the film are selected, and the required central wavelength and transmission bandwidth are determined.

Spectral band of the filter:

UV filter: the main feature is to allow UV (wavelength less than 400nm) a certain wavelength near a certain bandwidth of light through, its range of light cutoff.

Visible filter, visible light band is: 400nm ~ 700nm, can be cut off in the visible light band, can also be higher in the visible light band, according to the specific needs to determine

Make production.

Infrared filter: the main feature is the infrared band absorption plate absorption of infrared, visible light penetration/more used in monitoring systems, infrared devices, automatic optical detection equipment image equipment

Preparation, surveillance system, counterfeit inspection equipment, infrared camera and other fields.

Spectral characteristics of the filter: bandpass filter, cut-off filter, spectral filter, neutral density filter, reflection filter;

The membrane material of the filter: soft membrane filter, dura filter; The dural filter not only refers to the hardness of the film, but more importantly its laser damage threshold so it is widely used

In laser systems, soft film filters are mainly used in biochemical analyzers.

Filter is divided into color filter (all kinds of color plate glass or light film, its transmission bandwidth of hundreds of angsiometers, used in broadband metering or installed in the star spectrograph, in order to isolate the weight Overlap spectral level) and thin film filters (for longer wavelengths, used as infrared filters)

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