Services and Customization

1. Why install a shutter ? The shutter is installed between the lens and the detector, and can be started either manually or by setting time intervals. Its purpose is to compensate for temperature measurement deficiencies of the detector. Currently, due to limitations in process technology and software, both low-end foreign detectors and domestic detectors are unable to adaptively adjust based on external temperature and humidity conditions. Therefore, after observing for a period of time or when the temperature and humidity of the observed object change, thermal camera needs to use the shutter to block the detector to reset its parameters, achieving temperature measurement and image calibration. 2. What are the differences between thermal imaging cameras with and without a shutter? A thermal imaging camera detector without shutters has higher performance than one with shutters. The design without shutters indicates that the thermal imaging camera's detector can adapt to environmental changes. Coupled with advanced software algorithms, it can automatically achieve optimal observation results. In contrast, a thermal imaging camera with a shutter undergoes periodic shutter zero-calibration when observing objects. During the shutter opening and closing stage, there will be lagging in the thermal imaging camera's image and video transmission, which will be reflected in the data as frame loss. This occurs because no data is collected while the shutter is opening or closing. Therefore, during temperature measurement, thermal imaging cameras with a shutter will experience stuttering, whereas those without a shutter will provide smooth image performance. 3. Advantages and disadvantages of thermal imaging cameras with and without shutters: 1）With Shutters Advantages: · Strong anti-interference ability: The use of a shutter in thermal imaging cameras effectively prevents the influence of light and other disturbances, ensuring the accuracy of thermal imaging. · Reduced lens absorption: Shutter materials may have higher transmittance for infrared radiation, thus reducing the amount of infrared radiation absorbed by the lens and improving detector sensitivity. · Relatively lower cost: Thermal imaging cameras with shutters are more affordable compared to those without shutters, suitable for general applications. Disadvantages: · Reduced transmittance: Even shutter materials have high transmittance, there will still be some optical loss, which decreases the intensity of infrared radiation from the target to the detector, affecting image brightness and clarity. · Increased complexity: Shutters increase the optical complexity of infrared thermal cameras, potentially making installation and adjustment more cumbersome and increasing the likelihood of system failures. · Increased cost: Shutters requires additional manufacturing and installation costs, and may need regular maintenance and replacement, thus raising overall costs. 2)Without Shutters Advantages: · Higher transmittance: Without a shutter, it means higher transmittance, which allows more infrared radiation to enter the lens, improving image brightness and clarity. · Increased sensitivity: Thermal imaging cameras without shutters have higher sensitivity and can detect smaller temperature changes, offering significant advantages in certain applications. · Enhanced performance: Higher transmittance and simplified design may lead to higher system performance, such as faster image capture speed and higher spatial resolution. Disadvantages: ·Higher environmental requirements: Detectors in thermal imaging cameras without shutters need to operate in more stringent environments, requiring special features such as waterproofing, dustproofing, anti-interference to ensure stability and reliability. · Higher calibration costs: Thermal imaging cameras without shutters requires more complex non-uniformity correction algorithms and needs calibration under different environmental conditions, increasing calibration time and costs. In summary, when deciding whether to use a shutter, it's important to consider comprehensively factors such as the thermal imaging camera's application scenario, requirements, and budget.

     Yes, we can. Whether replacing parts or changing the design of components, Quanhom will try it best to meet your needs and provide you with professional advice and solutions. As one of the advanced opto-mechatronics component companies, we are delighted to serve our global partners with comprehensive services. The GLE12014D lens comes with a motor and a potentiometer, which could be formulated technical solutions according to your demands. Meanwhile, comprehensive testing again is essential to ensure that the lens is in the optimal condition. Besides, the interface can also be changed by replacing the adapter.

Yes, we can. Quanhom believes that customization is not only an essential service, but also what we always pursuit. As one of the advanced opto-mechatronics component companies, we are delighted to serving our global partners matching different OLEDs with comprehensive services. In the past five years, we have offered a variety of customized eyepieces, including replacing eyepiece interfaces, diopter adjustment rings, focus rings and so on. Here are a few examples.(1)Under certain conditions, the specifications of the thread interface can be customized. For instance, the thread interface of GE25 is M29x0.75, and the threaded interface of GE18RL is M31x0.75. It depends on requirements;(2)The diopter range can be adjusted according to needs, such as -5 to -4, -5 to +5, -6 to +2 or other ranges;(3) The appearance or material of the focus ring can be replaced. For example, the focus ring of the GE18 has two types: wide and fine.(as shown in the figure below). If you have any requirements, please feel free to contact us. We will try our best to offer you the optimal service!

The consistency of products to great content determines the product quality, only high consistent product can offer a better purchasing and user experience for clients. QUANHOM is an infrared specialty team that adheres to the principle of “Quality Foremost; Service Centered; Progress Guided; Innovation Driven” to practically implement the ISO9001 QMS, and severely carry out the quality control procedure—first article inspection, progress inspection, warehousing inspection and warehouse-out inspection. All operations on products correspond with the operation instructions to minimize the uncertain elements in the productive progress, then the stability and consistency of products can be guaranteed.

At present, the switching time of the dual field of view lens of the QUANHOM team is ≤3S. There are many factors that influence the parameter. Firstly, for the optical design aspect, the moving distance of the moving lens group plays a defining role in the switching time. Secondly, in the mechanical design aspect, the design of the cam curve and the selection of the electric motor influence a lot on the speed of switching the field of view. Finally, the control of the electric motor and Automatic Focusing Algorithm, to some extent, also exert influence on the speed of switching the field of view.

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 distortionB. Has a large negative vignettingC. Need athermalized designD. Different important factors in phase quality evaluation  From: Infrared and Laser Engineering Volume 49 Issue 6 Ultra-large field of view infrared optics

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 adjustB. 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 problemsC. 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

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 equipment7. Engineering inspection: water leakage detection, house wiring, artificial intelligence

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.

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.

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):

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.

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 windowWater 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.

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.