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How are infrared optical lenses designed and produced?

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. 2. After the band is determined, according to the overall performance requirements of the infrared system, the optical path layout is carried out, the technical parameters such as the focal length and the field of view of the infrared lens are determined, and the imaging quality requirements of the lens are determined at the same time.3. Select the initial structure form of the lens according to the performance index and optical path layout of the infrared optical lens. The initial structure is a typical structure form summed up in the case of a lot of design experience. The following is a brief list of a few: 4. Perform aberration correction and other optimizations on optical lenses through optical design software or other auxiliary tools. 5. Image quality evaluation of corrected and optimized optical solutions. 6. Calculate, assign and formulate processing tolerances and assembly tolerances of infrared optics components and assemblies.7. Draw infrared optical system diagrams, components and parts diagrams, etc. 8. All drawings are transferred to trial production drawings and start production trial production. 9. Test/debug the trial samples, issue test reports, optimize defects,10. Officially put into mass production and use.

What is the difference between ordinary and super-large field of view infrared optical lens?

What is the difference between super-large field of view infrared optical lens and ordinary infrared optical lens? A. The infrared optical lens with super large field of view has great distortion B. Has a large negative vignetting C. Need athermalized design D. Different important factors in phase quality evaluation  From: Infrared and Laser Engineering Volume 49 Issue 6 Ultra-large field of view infrared optics

What are the disadvantages of the nested guide mechanism commonly used in continuous zoom lenses?

The disadvantages of the nested guide mechanism commonly used in continuous zoom lenses A. In the continuous zoom process, the distance between each lenses has been strictly determined. At the structural design step, there are strict requirements on the size of the lens group and the lens barrel, and it is not easy to adjust B. Increasing the axial length of the guide rail can make the lens group more stable during the movement, but due to the limitation of the infrared optical design, the lens group has a limited range of movement. Once the range is too small, it will cause transmission problems C. Under special circumstances, it is necessary to use a zoom lens with nested motion, which increases the complexity of the structure and increases various costs. The shortcomings listed above are only individual phenomena, which can be improved from the source, that is, when carrying out the optical design of the continuous zoom lens, these problems should be taken into account, and the optical design can be carried out on the basis of avoiding these shortcomings. solve these problems. From: Thesis Motion Analysis of the Sliding Guide Mechanism of Infrared Continuous Zoom Lens Infrared Technology May 2020 Vol. 42 No. 5

What scenes can thermal imaging technology be used in?

1. Security monitoring: border security, urban security, coastal monitoring2. Infrared temperature measurement: industrial temperature measurement, human body temperature measurement, intelligent breeding3. Outdoor night vision: outdoor exploration, outdoor observation, outdoor search and rescue4. National defense and coastal defense: border inspections, target retrieval, firearms aiming5. Fire rescue: forest fire prevention, special substance detection, fire rescue6. Visual enhancement: automatic driving, equipment maintenance, medical equipment 7. Engineering inspection: water leakage detection, house wiring, artificial intelligence

What are DLC and AR coating?

Diamond-like carbon (DLC) membrane is an amorphous carbon membrane. The membrane contains a certain number of sp3 bonds, giving it a series of excellent properties close to diamond. It has the advantages of low deposition temperature and large area deposition.Among various hard membranes, DLC membrane can be positioned as a membrane material with high hardness and excellent wear resistance and low coefficient of friction.AR (Anti-Reflection) membrane cannot change the absorption rate of the lens itself. It can only increase the transmittance by reducing the reflectance on both sides of the lens, which is the so-called "reflection and antireflection". Light is an electromagnetic wave. By matching the refractive index and thickness of the AR membrane, the light produces multi-beam interference in the AR membrane-destructive interference on the upper surface and constructive interference on the lower surface.

The motor suddenly stops rotating. How do the troubleshoot?

If the motor stops suddenly:1. First check whether the cam of the lens has turned to the limit position.Because the limit switch can disconnect the circuit when the cam turn to the limit position, making the motor unable to run in one direction.2. If the cam of the lens is not in the limit position, check the wiring and power supply. Firstly, check whether the power supply is energized or whether the voltage meets the requirements. If there is the power and the voltage is within the required range, then check whether the solder joints are loose or fall off; If not, Find a well-confirmed wire to short-circuit each wire on the lens, and rule out whether the wires are disconnected one by one.3. If none of the above situations occurs, short-circuit the limit switch of the lens with a cable to observe whether the motor can return to normal and eliminate the cause of damage to the limit switch.4. Use a multimeter to measure the positive and negative output terminals of the motor on the auto-focus control board to check whether the voltage is normal under the condition of input and output.5. Finally, when the motor is running, lightly touch the motor with your hand. If the motor is severely hot, it is likely to be blocked or damaged. Please cut off the power immediately, remove the motor and let it run idling. If it can rotate normally, please check whether there is any foreign matter stuck on the lens structure. If it cannot rotate normally, please replace with a new motor and test again.

What materials are suitable for infrared lenses?

When designing infrared optical components, various factors related to the optical materials used must be considered. These factors include refractive properties, optical transmission, non-thermal properties, hardness/durability, environmental sensitivity, weight/density, manufacturing technology, and cost. Some of these factors are still interrelated. For example, for some materials, their optical transmittance is high at room temperature, but decreases at higher temperatures. Considering all these factors, when designing infrared optical components, careful consideration of material selection is required. Available materials are: germanium (Ge), silicon (Si), gallium arsenide (GaAs) and cadmium telluride (CdTe); zinc compounds, such as zinc sulfide (ZnS) and zinc selenide (ZnSe); water-soluble crystals, such as Potassium bromide (KBr), sodium chloride (NaCl) and potassium chloride (KCl); fluorides such as magnesium fluoride (MgF2), calcium fluoride (CaF2) and barium fluoride (BaF2); and other materials, Such as fused silica and sapphire; chalcogenide glass, etc. The currently available materials are as follows (blue is chalcogenide glass):

What is an AR coating

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 thickness of the film determines the wavelength of the reflected light that it acts on. When light is reflected twice on the AR coating, it will interfere with the original reflected light, thereby weakening the reflected light. According to the conservation of energy, the energy of light does not change. Therefore, when the reflected light decreases, the transmitted light increases. This is the principle of AR coating. Generally, when choosing an AR coating, you need to determine the wavelength, such as infrared, visible and ultraviolet.

What is an atmospheric window?

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 according to their respective scopes.Infrared window Water vapor molecules are the main absorbers of infrared radiation. Strong water vapor absorption bands are located at 0.71~0.735μ (micron), 0.81~0.84μ, 0.89~0.99μ, 1.07~1.20μ, 1.3~1.5μ, 1.7~2.0μ, 2.4~3.3μ, 4.8~8.0μ. An absorption band of carbon dioxide appears at 13.5~17μ. The gaps between these absorption bands form some infrared windows. The widest infrared window is at 8-13μ (there is an absorption band of ozone near 9.5μ). 17~22μ are translucent windows. After 22μ until the wavelength of 1 millimeter, due to the severe absorption of water vapor, it is completely opaque to observers on the ground. But in places with high altitude and dry air, the radiation transmittance of 24.5~42μ can reach 30~60%. At 3.5 kilometers above sea level, radiation of 330-380μ, 420-490μ, 580-670μ (transmittance of about 30%) can be observed, and 670-780μ (about 70%) and 800-910μ (about 30%) can be observed. 85%) radiation.

How does the MTF curve reflect the performance of the lens?

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, the better, and the more consistent the imaging in different directions. 3. The low frequency curve represents the contrast characteristics of the lens, and the high frequency curve represents the resolution characteristics of the lens.

How can the thermal imaging module without zooming and automatic focus function realize the automati

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 control board.The Principle of operation is easy. Connect the motor and potentiometer to the control board, by which sending the command to control the motor. Then the analog video of the thermal imaging module is output to the control board which will analyze the analog video. In the process of the automatic focus, the control board will analyze the position of the focus motor corresponding to the clearest picture, and then control the focus motor running to the position through the control board to complete the automatic focus. As soon as the customer have their needs, we will try our best to meet the need. The Y02 control panel provided by our company have lots of functions:Besides the basic zooming and automatic focus function, it has the present position function, the designated location zooming and focus function, the automatic focus fine tuning function, the automatic reading zooming and focus functions of the upper and lower limits. In order to ensure that our control panel can meet the requirement of the most customer and be suitable for most application scenarios, the temperature compensation function, the encoder motor control function and focal automatic control function are currently being added. Contact us directly if details about the Y02 control board are required.

What are the categories of analog video?

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 serves 25 frames per second.NTSC is the color television broadcasting standards formulated by National television setting committee in 1952. It is adopted by most of the American countries, like America, Canada and Mexico, and China Taiwan, Japan, Korea and Philippine, as well as some TV company in Hongkong, South China. It serves 30 frames per second.ECAM: At present, countries that adopted SECAM is mainly commonwealth of In dependent stares, such as Russia,France, Egypt and some French-speaking countries in Africa. Therefore, in order to ensure that the analog video output of the movement can be used normally, modules will output two kinds of analog video: PAL and NTSC for choice.

How does the spectral filter work?

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, neutral density filters can calibrate thermal imaging cameras to higher temperatures and radiation ranges, such as 3000°C.   Another type of filter is a spectral filter, which shields the radiant energy in a specific band, which is helpful for you to test in the band of interest—for example, shooting and tracking a chemical gas plume visible only in a narrow area of the spectrum or depicting a target through the target flame. Under normal circumstances, the heat generated by the flame will occupy the main part of the image, but the spectral filter can shield it, allowing you to see what you want to see.

What is a reflex peripheral infrared thermal imaging optical system, and what are its advantages

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 solution avoids using multiple thermal imaging cameras placed in different viewing directions to achieve panoramic imaging or rotating a single thermal imaging camera to achieve panoramic imaging (which will cause image delay). Still, this solution also has certain limitations. This solution must use a large-scale area array focal plane device to improve the thermal imaging system's resolution. This kind of scheme is mainly used for a limited range, which is only suitable for short-distance security monitoring and warning and is unsuitable for long-distance detection and imaging.