What are the common types of zoom mechanisms and their advantages? 1. Slide transmission mechanism: This mechanism is simple in structure and compact in size. The slide matches the inner wall of the main lens tube with high-precision zoom. It can be designed into a multi-finger configuration for flexibility and can...

Assuming that NETDA It is not entirely correct. NETD (Noise Equivalent Temperature Difference) is a critical parameter for assessing the performance of IR imaging systems. It reflects the system's temperature resolution for low-frequency scenes (uniform large objects) but does not represent the system's temperature resolution capability for sc...

1）Impact of Light Conditions - Low-light night vision device is a night observation device that enhance faint reflected light from targets using image intensifiers so that the human eye can see the target image. Its imaging principle is significantly affected by environmental factors e...

1.What are the thermal characteristics of large-aperture infrared lenses at different temperatures? As the temperature drops, the thermal deformation of the optical lens increases. This is because the lens barrel,O-ring and other mechanical parts squeeze the lens, which increases the thermal stress of the lens. The surface shape of the lens cha...

The curve of the infrared radiation received by the detector varies with the parameters, and the change trend is clear: at low altitude, the infrared radiation received by the detector decreases linearly with the increase of the detection height; it shows a Gaussian distribution with the change of the azimuth angle...

1. What are the advantages and disadvantages of 2D drawings and 3D models? 2D Drawings: Advantages: It can completely express parts of all necessary information for manufacturing and processing, including dimensions, technical specifications, tolerance. The drawings can be converted into various formats, and printed (or output) drawings can be ...

In winter, not only low temperature is a factor that affects infrared cameras, but also the sealing performance of each component is a significant challenge. Low temperature will impact the performance of electronic components, such as decreased battery life, electro-optical system malfunctions, etc. Low temperature, rain or snow will also caus...

In the process of performing reconnaissance and strike missions, UAVs need to carry various electro-optical payloads, such as infrared thermal imaging cameras, laser rangefinders, etc. During flight, the UAV’s attitude movement and the windage torque will cause the boresight pointing to be unstable. These external factors will seriously affect ...

1. Security SurveillanceWidely employed in video security surveillance for sensitive areas such as shopping malls, communities, banks, warehouses, etc., especially for night security.2. Personal consumptionCommonly used in outdoor activities like adventures and field scientific expeditions. Some manufacturers have developed mobile phones with p...

An infrared optical window is a selectively transparent component designed based on its material to allow specific wavelengths of light to pass through. These windows are carefully designed to maintain optical clarity, withstand environmental conditions, and minimize any distortion or alteration of the light passing through them. They are prima...

EO/IR stands for "Electro-Optical/Infrared," a comprehensive technology that integrates Electro-Optical (EO) and Infrared (IR) sensing. Both technologies are used for the detection and acquisition of light and thermal radiation in different wavelength bands, enabling surveillance, reconnaissance, navigation, and other applications. Specifically...

Thermal sensitivity (NETD) stands for Noise Equivalent Temperature Difference, which is a critical parameter for evaluating Medium-Wave Infrared (MWIR) and Long-Wave Infrared (LWIR) thermal imaging cameras. It is a value that represents the signal-to-noise ratio of the temperature difference, which is equivalent to the instantaneous noise of th...

The infrared sight consists of objective lens, shell, eyepiece, battery, connector, etc., as shown in the diagram 1. Diagra...

1. The composition and working principle of laser rangefinder: ·The laser rangefinder consists of an optical system, a laser, a drive circuit, a receiving circuit, a signal processing circuit, a system power circuit and an external data interface circuit, as shown in the figure below: ...

The stray lights will exist in every optical-mechanical system, which is impossible to completely eliminate, but can be reduced through certain methods. The methods of suppressing stray lights are mainly three aspects: optical design, mechanical structure and surface finishing. · In terms of optical design, stray lights can be suppress...

With the development of computer hardware and software technology and its application in the design of optoelectronic systems, many representative design and simulation tools and software sprung up. These include: ZEMAX, CODE V, OSLO, LENSVIEW, ASAP, TRACEPRO, LIGHTTOOL, TFCALC, OPTISYS_DESIGN, ASLD, Multisim, COMSOL Multiphysics and so...

Modulation Transfer Function (MTF) of a lens is an important indicator of its performance. Both lens designers and users need to have a deep understanding of MTF.1. What is MTF?The function of the lens is to image the object on the sensor. An object is composed of countless points. The image formed by every single point of the object wi...

Both are variable lenses with variable focal length and adjustable sharpness. But there is several fundamental differences:A. Structurally, a continuous zoom lens has two sets of adjustable lenses, which are used to adjust the focus and sharpness respectively. The dual-field lens has only one set of adjustable lenses, which is used to s...

Optomechanical systems are typically made of several materials with different thermal properties. These materials compose the optics (refractive or reflective elements) and the mechanics (optical mounts and system housing). As the temperature of these materials change, the volume and index of refraction will change as well, increasing s...

(1)The focal length can be changed uniformly as well as continuously. With the increasing improvement of processing and assembling technology, the application of the zoom structure is becoming more and more common, and its function is becoming more and more convenient. In the continuous zoom system, the focal length can be uniformly cha...

According to the summary of scholars and research institutions at home and abroad, there are five main contact forms among the pressing ring, the spacer and the concave-convex lens: sharp corner, tangential, toroidal, spherical, and oblique plane.1) Sharp corner interfaceOn a pressing ring or spacer, a curved surface with a radius of ab...

(1) Equal gap design. Equal gap refers to the design of the motion curve of the zoom group as a straight line. That is, the movement of the zoom group along the optical axis is linearly related to the cam angle, and the movement of the compensation group and the cam angle are non-linear. The advantages: convenient processing, high proce...

Temperature variation will result in changes in all parameters of the infrared system, which will influence its image plane position and image quality. Therefore, athermalized design is required. Generally, temperature affects the infrared system in the following three ways:1. The refractive indexes of the infrared optical component...

Without considering atmospheric transmittance and radiative transmission loss,A. To the source point, the irradiance of the object at the source point is inversely proportional to the square of the distance. Although the radiation intensity of the source point does not change, the field angle between the source point and the thermal ...

Many factors can affect thermal imaging temperature measurements, such as the emissivity of the target, the radiation temperature of the target, the atmospheric radiation temperature, the ambient reflection temperature, and other external factors; meanwhile, it is also affected by the lens temperature, the temperature of the detector ar...

1.Sensitivity. Near the peak of the focusing function, when the abscissa changes simultaneously, the y-coordinates of different focusing curves change to various degrees. The more significant is the y-coordinate variation near the peak value, the easier it is to find the real focal plane.2.Width of the Steep Region of the Curve. In the ...

A. image space stitching (internal stitching) refers to the image stitching using multiple detectors, which can be done directly, or by using optical elements. In both ways, inner stitching arranges the detectors in a certain order to form a whole receiving target plane. Some have proposed stitching by reflective prismatic decompositi...

1. Dual-detector and dual-band imaging technologyThe method uses two detectors with different wavelength bands and separate optical systems to construct dual-band imaging, and then obtains dual-band images through image registration and fusion technology.2. Dual-line and dual-band imaging technologyTwo-band detection line arrays are pla...

1. Determine the use band according to the usage scenario, system requirements, cost requirements, etc. Most of the occasions use a single band such as short wave, medium wave or long wave, but some special occasions need to use multiple bands. ...

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 ...