Anti-reflective coating (English: Anti-reflective coating, AR) is a surface optical coating that increases transmittance by reducing light reflection. In complex optical systems, it can improve contrast by reducing scattered light in the system. Many coatings include transparent film structures with different refractive indices. The th...

Atmospheric window fefers to some bands of celestial radiation that can penetrate the atmosphere. Due to the absorption and reflection of radiation by various particles in the earth's atmosphere, only radiation from celestial bodies in certain wavebands can reach the ground. Divided into optical window, infrared window and radio window ...

1. The space enclosed by the MTF curve, the horizontal axis and the vertical axis, the larger the area, the better, and the better the lens imaging performance. The flatter the MTF curve, the better. The flatness indicates the imaging uniformity of the edge and center of the lens.2. The closer the sagittal curve and the meridian curve, ...

Although without zooming and automatic focus function, even installed with a continuous zoom lens or motorized lens, the thermal imaging module can't realize zooming or automatic focus function, We can realize these functions in the case of not changing thermal imaging module by using other subsidiary products like automatic focus contr...

There are three main formats of analog video signals; PAL,NTSC and SECAM, in which PAL is called P system and NTSC is called N system, as is often said.PAL (phase Alternating Line) is a TV system established in 1965. With the exception of NTSC in parts of North America and East Asia and SECAM is adopted in most parts of the world, which...

There are two general types of spectral filters for thermal imaging cameras.One is a neutral density filter (ordinary filter), which attenuates the energy of the entire wavelength range to the same degree. For example, neu...

Title The peripheral vision imaging system can stare and image the space within the range of 360° azimuth angle and certain pitch angle.This panoramic thermal imaging so...

l Higher resolutionl Strong fog penetration abilityl Low-light imaging (night vision capability)The glow of the atmosphere at night contains shortwave infrared components. Shortwave infrared can be imaged in the lowest sta...

The target radiation can only reach through the air and be imaged on the infrared thermal imaging camera. In addition to attenuating the target's radiation, the air will also add some interference signals during the ...

The actual optical system cannot achieve strict temperature compensation, that is, in a certain temperature range, the image surface of the system cannot be consistent with the change of the lens barrel with complex struct...

1) Mechanical (electromechanical) active temperature compensation From the basic theory of optics, we know that when the axial position of a lens (or lens group) in the optical system is changed, the focal plane posit...

In the process of athermal design of the infrared optical system, the following issues should be paid attention to. (1) With the change of temperature, the original aberration compensation relationship is destroyed, and the best focus position of the system may change nonlinearly with the change of temperature. (2) For the reflect...

Infrared optical systems often work in environments with a relatively large temperature range. The thermal expansion coefficient of optical materials and mechanical materials and the change in refractive index of optical materials with temperature will seriously affect the performance of the optical system. Compared with optical ma...

The basic starting point of optical athermalization technology is to use the temperature characteristics of different optical materials, such as linear expansion coefficient, refractive index temperature gradient, etc. ...

The total radiation emitted by the target in the mid-wave infrared and long-wave infrared bands can be obtained by integrating the Planck formula. At different temperatures of the target, the total infrared radiation in the medium-wave and long-wave bands is shown in the left figure below; the ratio of the total infrared radiati...

The answer is not necessarily.It can be understood that the resolution of the human eye is limited, too high-resolution microdisplays such as UHD cannot improve the effect much, and the 4μm pixel almost matches the human eye.Quanhom GE25 supports screen size of 0.61 inches and a pixel size of 4μm. In general, an SVGA re...

The focal length determines the field of view (FOV) of the thermal imaging camera. The longer the focal length, the smaller the FOV, which translates into more pixels across a target at a fixed range (meaning, the target a...

A good assistant method for monitoring targets in thermal imaging by IR zooming lens with thermal imaging cores especially for long-distance surveillance and homeland security ...