Radiation Filtration

Introduction

Radiation filtering is a method that is used to reduce the degree of inhomogeneity or highlight a certain component of mixed (polychromatic) radiation in various fields of science and technology. In this article we will look at the basic aspects of radiation filtering and its applications in various fields such as photonics, laser technology, spectroscopy and

The topic of the article is “Radiation Filtration” Contents

Filtration is a purification process used in various fields of science and technology. In this case, we are talking about radiation filtration - reducing the degree of heterogeneity of the light beam or highlighting one or more of its components. Filtering of radiation is carried out using special optical devices - filters.

What is radiation? Radiation is waves of various lengths and frequencies that come out from any light sources, such as the sun or an electric arc. They can be x-ray, ultraviolet, infrared, visible or infrared. Depending on the application, it is important that the filters allow filtering of only certain ranges of radiation without absorbing light or creating additional interference.

For example, for use in optical instruments (microscopes, telescopes), it is necessary to select filters that allow the transmission of only long waves of the optical spectrum (from 400 nm to 700 nm), since thermal radiation is usually not useful for the optical system. There are also filters that transmit only short wavelengths, such as those used to illuminate large spaces (industrial lamps). Ultraviolet and X-ray filters are used in medical devices and space technology.

Important characteristics of filters are their transmission and reflection. Transmittance determines the filter's ability to transmit light through itself and is measured as a percentage. To transmit light to a surface