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The Cooled Dual-FOV infrared thermal imager is a mature and highly reliable product independently developed by our company that complies with ISO standards. It uses high-quality materials and advanced manufacturing technology.The dual field thermal imaging instrument has strong adaptability to harsh environments and can achieve both long-distance detection and detail recognition, greatly improving detection accuracy.
Details Parameters
The 191mm / 338mm cooled dual FOV infrared lens is a high-end optical solution designed for advanced EO/IR thermal imaging systems requiring both long-range detection and flexible field-of-view switching capability.
This dual field-of-view (Dual FOV) design integrates two focal lengths within a single optical system, enabling seamless switching between wide-area search (191mm) and long-range identification (338mm) modes.
It is engineered for cooled infrared detectors operating in the 3–5μm MWIR or 8–12μm LWIR bands (depending on configuration), and is widely deployed in defense, border surveillance, maritime monitoring, and large-scale security systems.
This LWIR Lens for Cooled Camera is designed for system integrators and large-scale project procurement, rather than single-unit equipment buyers.
Advanced technologies for the highest performance long-wave focal planes:
1.High-durability and hard-carbon 7.6-9.7 µm LWIR wavelength DLC exposed mirror coating.
2.High precision manufacturing processes and strict quality control procedures ensure stable imaging in various practical use environments.
3.Optimized for 640x512 LWIR cameras with 24 μm pixel pitch.
4.Dual field of view design to meet various application requirements.
Unlike fixed focal length lenses, the Dual FOV system provides:
191mm for detection and area search
338mm for target recognition and identification
Seamless switching between surveillance modes
Reduces need for multiple optical modules
Improves system efficiency in dynamic environments
Enhances response speed in target tracking scenarios
Designed for integration into EO/IR payload systems
Supports advanced thermal imaging platforms
Ideal for multi-sensor surveillance architectures
Integrated 191mm / 338mm switchable focal system
Optimized for long-range detection and identification
High precision optical alignment for stable switching performance
Designed for cooled thermal detectors
Compatible with high-end EO/IR imaging platforms
Suitable for high-sensitivity infrared applications
Enhanced target recognition at extreme distances
Low distortion optical system
High-resolution imaging for critical decision support
EO/IR platform compatible mechanical design
Support for large-scale system integration
Designed for continuous operation in harsh environments
The cooled dual FOV lens is designed for high-end surveillance and defense systems requiring adaptive imaging capability.
Enables rapid switching between search and identification modes
Reduces system complexity by replacing multiple single-FOV lenses
Enhances operational efficiency in mission-critical environments
Optimized for high-end EO/IR integration platforms
| Specifications | ||
| OPTICAL | ||
| Focal Length / F# | 191mm/338mm F2.0 | Compatible with detectors having 191mm&338mm |
| Detector (FPA) type | 640×512-24μm | |
| Working Spectral Band(SR) | 7.6um-9.7um | |
| FOV | 10.36°×8.3°/3.46°×2.77° | |
| Exposed Mirror Coating | DLC | AR and HD are available upon request |
| MECHANICAL | ||
| Zoom Mechanism | Motorized | |
| Total Weight | lens and control pannel | |
| Dimensions | 307.01mm×210mm×185mm | Length is available upon request |
| Mount | Customized to Specification | |
| ENVIRONMENTAL | ||
| Operating Temperature | -40ºC to +60ºC | |
| Storage Temperature | -40ºC to +60ºC | Keep two houres when test |
| Shock and Vibrations | Per applicable standard | |
| Front Lens Sealing | IP67 | |
DRI ranges enable one to easily estimate the maximum range that an object can be either detected, recognized or identified. It is important to note that these estimates are based solely on geometrical parameters – the target size, distance, lens focal length and camera detector pixel size. Signal level, detector sensitivity, atmospheric conditions and other factors are not considered!
Detection: An object is present – Car7.16km/12.68km&Person1.59km/2.82km.
Recognition: discern the type of object – Car2.39km/4.23km&Person0.53km/0.94km.
Identification: discern specific objects –Car1.19km/2.11km&Person0.27km/0.47km.
This dual FOV cooled infrared lens is widely used in large-scale and mission-critical systems:
Border surveillance and national security systems
Maritime and coastal monitoring platforms
Airborne EO/IR reconnaissance systems
Long-range tracking and early warning systems
Defense and military thermal imaging platforms
Large-scale integrated surveillance networks
This product is not a standard catalog lens. It is designed for:
Project-based bulk supply
Long-term system deployment programs
Government and defense procurement projects
Multi-sensor imaging platforms
Command and control surveillance systems
Vehicle, airborne, and naval integration systems
Optical customization for system requirements
Integration support for thermal imaging platforms
Long-term supply chain cooperation
In advanced EO/IR systems, a single focal length is often insufficient.
The dual FOV system solves this by:
Using wide FOV (191mm) for rapid target acquisition
Switching to narrow FOV (338mm) for precise identification
Reducing operational delay in dynamic tracking scenarios
Improving mission success rate in complex environments
This makes it a critical optical component in modern surveillance architectures.
IRLENS supports system-level customization for dual FOV infrared lenses:
Optical design adaptation for platform requirements
Detector compatibility optimization (MWIR / LWIR cooled systems)
Mechanical and interface customization for EO/IR systems
Environmental ruggedization for defense applications
Batch production for large-scale deployment programs
Explore other infrared optical solutions:
19mm LWIR Lens – Wide-angle thermal imaging
50mm LWIR Lens – Standard surveillance applications
100mm Motorized LWIR Lens – Medium-range EO/IR systems
160mm Motorized LWIR Lens – Long-range identification systems
Beijing IRLENS specializes in the design and manufacturing of advanced infrared optical systems for MWIR and LWIR thermal imaging applications. We provide system-level optical solutions for global defense contractors, EO/IR system integrators, and large-scale surveillance platform developers.
The 191mm / 338mm cooled dual FOV infrared lens is a system-level EO/IR optical solution designed for long-range detection and identification missions. With dual focal length capability, cooled detector compatibility, and integration-ready architecture, it is widely used in defense, maritime, and large-scale surveillance systems requiring high-performance thermal imaging.
High Performance Mid-Wave Focal Plane
Passive Athermalized Lens Assembly
Using advanced technologies, top-quality materials and unique coating techniques, together with innovative engineering and opto-mechanical designs, we have earned a reputation for excellent performance, durability and quality.
FAQ
View MoreWhat is an infrared lens?
An infrared lens is a type of optical lens that is designed to focus infrared light. It is made of materials and has coatings that allow it to efficiently transmit infrared wavelengths, which are longer than those of visible light. Infrared lenses are used in various applications such as infrared cameras, thermal imaging systems, and night vision devices, enabling the capture of images in low-light or no-light conditions based on the infrared radiation emitted or reflected by objects.
What are the main applications of IR lenses?
Infrared lenses are widely used in many fields. In the field of security and surveillance, they are used in infrared cameras for night monitoring to detect intruders or monitor activities in the dark. In the military, they are used for night vision goggles and infrared detection systems to enhance situational awareness. In industry, they are applied in thermal imaging cameras for equipment inspection, detecting overheating components or heat leaks in pipelines. In addition, infrared lenses are also used in astronomy for observing celestial bodies that emit infrared radiation, and in some scientific research fields such as environmental monitoring and remote sensing.
What materials are commonly used to make IR lenses?
Common materials for infrared lenses include germanium (Ge), zinc selenide (ZnSe), and silicon (Si). Germanium is a popular choice due to its excellent infrared transmission properties in the mid-wave and long-wave infrared regions. It has a high refractive index, which allows for more compact lens designs. Zinc selenide is another commonly used material that offers good infrared transparency and is suitable for a wide range of infrared wavelengths. Silicon is also used, especially in the near-infrared range, and has the advantage of being relatively inexpensive and compatible with semiconductor manufacturing processes.
How are infrared lenses designed to handle different infrared wavelengths?
Infrared lenses are designed with materials and optical geometries that are optimized for specific infrared wavelength ranges. For example, lenses for near-infrared (NIR) applications may have different refractive indices and curvatures compared to those for mid-wave infrared (MWIR) or long-wave infrared (LWIR).
How is the performance of an IR lens evaluated?
The performance of an infrared lens is evaluated by several parameters. Modulation Transfer Function (MTF) is an important indicate that measures the lens's ability to transfer contrast from the object to the image plane at different spatial frequencies, indicating the sharpness and clarity of the image. Another parameter is the focal length, which determines the magnification and field of view of the lens. The aperture or f-number affects the amount of light that can pass through the lens and thus the brightness of the image. In addition, factors such as chromatic aberration, distortion, and the lens's ability to maintain focus over a range of temperatures also play important roles in evaluating its performance.
How to ensure the quality of infrared lenses during the manufacturing process?
During the manufacturing process of infrared lenses, strict quality control measures are essential. This includes precise grinding and polishing of the lens surfaces to achieve the required curvature and smoothness, which is crucial for accurate focusing and minimizing light scattering. High-quality coating processes are also necessary to apply anti-reflective coatings that enhance the infrared transmission and reduce unwanted reflections. Meticulous inspection and testing at each stage of production, such as using interferometers to measure surface accuracy and another testing equipment to evaluate optical performance, help to identify and correct any defects or deviations from the required specifications. Additionally, maintaining a clean and controlled manufacturing environment is important to prevent contamination that could affect th
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Application Scenario
In the aerospace field, infrared lenses play an indispensable role. Airborne night vision is one of its important applications. In addition, in satellite remote sensing, infrared lenses can penetrate clouds and obtain information such as surface temperature and vegetation cover, contributing to agricultural monitoring, geological exploration, and more. It also can detect the infrared radiation of celestial bodies like asteroids and comets.
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Infrared lens can operate in low-light or even complete darkness, using the infrared radiation emitted by objects for imaging. Moreover, they are not affected by severe weather such as heavy rain and thick fog, and can penetrate these obstacles to capture targets, ensuring the stability of monitoring, greatly enhancing the reliability and comprehensiveness of security monitoring.
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Since different materials and components in industrial settings have distinct infrared emission characteristics, these lenses enable the detection of thermal anomalies. In the manufacturing of mechanical parts, infrared lenses can detect areas with abnormal heat distribution during the production process, helping to ensure product quality and prevent defects.
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At the fire scene, infrared lenses can penetrate smoke and flames and clearly display the location of trapped persons, the direction of fire spread, and the ignition point. This helps firefighters quickly formulate rescue plans, improve search and rescue efficiency, and reduce casualties and property losses. In addition, it can also be used for fire hazard investigation to discover potential fire risks such as overheating of electrical equipment and accumulation of flammable materials in advance.
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Infrared lenses are the key components in gas detection instruments, enabling the precise identification and quantification of various industrial gases. Many industrial gases have unique absorption characteristics in the infrared spectrum.
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These lenses are designed to capture infrared radiation, which is invisible to the human eye but emitted by objects based on their heat signatures. They focus this infrared light onto an image sensor, converting it into a visible image that can be displayed on a monitor inside the vehicle. This enables drivers to perceive potential obstacles on the road much earlier than with normal vision, providing them with more reaction time and significantly enhancing driving safety in low-light conditions.
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