Application of filter
Filter is a strange concept for many people. It seems to be a little far away from our daily life, but it is not.
If we carefully observe the surroundings, we will find that many aspects of life are inseparable from filters: for example, there are antireflection filters on myopia lenses for correcting vision, high reflection filters on automobile reflectors, and the core components of projectors widely used in business offices are a collection of a variety of filters. Many monochromators, one of the core components of biochemical detectors used in hospital examinations, use narrowband filters, Long wave pass filter, short wave pass filter, various optical instruments, liquid crystal display, banknote anti-counterfeiting technology, optical communication, laser technology, etc. are used in digital cameras, which are closely related to the development of filter technology. It can be said that without the development of filter technology as the basis, many modern emerging technologies are difficult to achieve the current achievements.
Optical filter refers to coating one or more layers of dielectric films or metal films on optical elements or independent substrates to change the characteristics of light wave transmission. Using the characteristic changes of light wave in the transmission of these films, such as transmission, absorption, scattering, reflection, polarization, phase change, etc., to design and manufacture various optical filter products to achieve scientific and engineering applications. Manufacturing filter technology is a complex engineering technology, involving many professional technical fields, including vacuum acquisition technology, real dragon measurement technology, computer aided design technology, optical property detection technology, electronic circuit technology, material property detection and preparation technology, etc.