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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
In daily life, human vision can observe objects of various colors, and the colors of filters in optical components also include red, orange, yellow, green, blue, purple, and other colors. So, what determines the color of the filter lens? Firstly, we need to understand the principle of light's action. The principle of light transmission on transparent and opaque media is different. 1、 The color of opaque media is determined by the colored light reflected by it. The color of opaque objects (such as tables and walls) is determined by their reflection
So far, we have discussed directly measuring the optical properties of filters, but there are still some natural properties of objects that are difficult to measure, which are related to the quality and processing of the film and substrate. For any optical component, a detailed description of the substrate will be provided, such as surface shape, polishing degree, allowable smear, smoothness, etc. The substrate should not be considered here. Mil-e13830a has been widely used in the United States, providing optical components including substrates
Optical coating refers to the process of coating one or more layers of metal or dielectric thin films on the surface of optical components. The purpose of coating the surface of optical components is to reduce or increase the requirements for light separation, reflection, beam separation, filtering, cutoff, polarization, etc. Vacuum coating and chemical coating are commonly used. The optical coating thin film design system includes optical thin films such as anti reflective films, reflective films, bandpass filters, cutoff filters, and depolarization films. Anti reflection film and residual anti reflection film in narrowband and broadband
A filter lens, as the name suggests, is an optical component that filters out a portion of light. Due to the fact that the characteristics of light are determined by two factors, frequency and intensity, filters are divided into two categories: frequency filters and intensity filters. Among them, frequency filters are also known as filters, because the color of light is caused by its different frequencies. Intensity filters include skylight filters, and frequency filters (color filters) include orange filters, yellow filters, etc. Filters of different colors can be used to dress up