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As an optical component, a filter is a tool used to select the desired radiation band. It is made by adding special dyes to plastic or glass sheets, and its main feature is that its size can be made quite large. Thin film filter, usually passing long wavelength light, is commonly used as an infrared high transmittance filter. The latter is a low order, multi-stage series solid interferometer formed by vacuum coating a metal dielectric film with high or low refractive index or a certain thickness of all dielectric film on a certain substrate
Infrared filters are mainly used in infrared communication products, security monitoring fields, night vision products, infrared receivers, infrared detectors, infrared sensing, etc. There are two types of materials for infrared filters, one is coated with optical glass, and the other is made of PC or PMMA materials, with a black appearance color. This type of infrared filter made of PC and PMMA material can effectively cut off visible light and transmit infrared light. The cut-off rate of visible light range is related to the transmittance and thickness of infrared light
A beam splitter is a special optical processing substrate coated with high-precision optical media to ensure no ghosting, high smoothness, no black spots or stray light in imaging. It is used in optoelectronic sensing devices such as optical instruments, biochemical and medical instruments. A beam splitter is actually a beam splitter with sharp edges. It is coated with a special film on the surface, which allows the incident light to reflect half and transmit half, thus splitting a beam of light into a reflected beam and a transmitted beam, forming two beams. The beam splitter partially reflects the incident light
In evaporative deposition coating technology, the source material in the vacuum chamber is heated or evaporated by an electron beam, and the vapor condenses on the optical surface. During the evaporation process, optical coatings with uniform thickness can be obtained by precisely controlling heating, vacuum pressure, substrate positioning, and rotation. Evaporation is a relatively mild technology that can cause the coating to become loose or porous. This loose coating has water absorption, which changes the effective refractive index of the film, resulting in a decrease in performance. leave
Filter is an essential optical component in photography, which can change the spectral intensity distribution or polarization state of incident light according to requirements. In terms of optical propagation direction behavior, there are mainly reflection, transmission, scattering, polarization, and density attenuation. Transmission and reflection occur simultaneously on both surfaces of the filter. From the perspective of energy, reflectivity, transmittance, and absorptivity are often used to represent the distribution of energy, and they have different fractions according to different needs
How to choose a light source for facial recognition filters? In facial recognition image acquisition devices, high-power infrared diodes with wavelengths of 850 nm and 940 nm are usually used as the light source. Although LED products purchased on the market have nominal values of 850 nm or 940 nm, there are still many deviations when measuring the center wavelength of specific LED products. Taking the 850nm light-emitting diode as an example, the actual center wavelengths are 835nm and 865nm, respectively
Laser crystal material is a type of crystal material that converts the energy provided by the external environment into highly parallel monochromatic laser material, and converts it into highly parallel monochromatic laser material in space and time. It is the working substance of a crystal laser, and the laser crystal rod is composed of a luminescent center and a matrix crystal. The majority of the luminescent centers in laser crystals are active ions, which partially replace cations in the matrix crystal to form doped laser crystals. When the active ions become a part of the matrix crystal
Definition of bandpass filter: In a certain frequency band, there is only a small band with high transmittance in the middle, and the cutoff band with high reflectivity is on both sides of the band. This type of filter is called a bandpass filter. The main function is spectral selection, which allows the desired light to pass through and cuts off unwanted light. At present, bandpass filters have a wide range of applications as optical components for selecting spectra and filtering out unwanted light. There are several factors that affect the price of bandpass filters, including: 1
Filters are used for two types of installation and usage, one for colored or colorless optical glass used in lenses, which we refer to as filters for clarity. Filters can be divided into black and white photography filters, color photography filters, commonly used black and white photography filters, and special effects filters. Another method is to place the filter in front of the flash to adjust the color tone of all or part of the subject, in order to produce a special color effect. For the filter installed in the flash, it can be extended
Laser protective mirror, also known as laser window or optical window, is an optical flat lens that serves to protect electronic components, sensors, and semiconductor components in the optical path. Window panel is one of the fundamental optical components in optics, which does not change the magnification of the optical system and only affects the optical path length in the optical path. Mechanical properties such as transmittance, surface accuracy, thickness, parallelism, and substrate material are important parameter indicators for window panels. Laser protective mirror is formed by precision grinding and polishing to form two flat surfaces