Infrared antireflection window suitable for thermal imaging light path system
By using the combination of YbF3 base film and ZnS film on the infrared window, combined with the heating coating and pore structure, the problem of light reflection in the thermal imaging optical path system is solved, achieving better imaging effects and equipment life extension.
Patent Information
- Application Number
- CN202421363747.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-15
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-06-15
AI Technical Summary
The existing infrared windows have light reflection problems in thermal imaging optical path systems, resulting in poor imaging effects and insufficient uniformity.
An infrared anti-reflection window suitable for thermal imaging optical path system was designed, using YbF3 as the base film, and covering the ZnS film on its upper and lower surfaces, and a heating coating and pore structure were set up to reduce reflection and reduce the influence of mist.
It effectively reduces the reflection of infrared filters, improves spectral stability and imaging effects, and at the same time, through the effect of heating coating, the impact of mist on the window is reduced and the service life of the equipment is extended.
Smart Images
Figure CN222481641U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of infrared windows, in particular to an infrared anti-reflection window suitable for a thermal imaging optical path system. Background Art
[0002] A thermal imager is a device that can detect tiny temperature differences. It collects infrared radiation from objects in the scene and converts it into electrical signals, ultimately forming a thermal image representing the temperature difference on the display. Since different objects have different temperatures, they emit different intensities of infrared radiation, which allows the thermal imager to create sharp contrast in the image. The infrared window is equivalent to the role of the eye in thermal imaging. By allowing only specific wavelengths of infrared radiation to pass through, the filter can help improve the contrast of the image and make the temperature difference more obvious. In some cases, there may be other light sources in the environment (such as sunlight or artificial light sources), which may interfere with the measurement of the thermal imager. The infrared filter can effectively suppress the light of these non-target bands, ensuring that the instrument mainly receives infrared radiation from the object itself. It can also protect the detector in the thermal imager from physical factors such as dust and water vapor, extending the service life of the equipment. However, due to the optical refractive index of air is 1, the optical refractive index of germanium is 4.3, and the optical refractive index of silicon is 3.3. There are differences in the propagation of light in different media, which causes the reflection of light, and then causes the energy of the transmitted light to decrease, resulting in poor imaging effect and insufficient uniformity. Utility Model Content
[0003] The utility model aims to solve the shortcomings in the prior art and proposes an infrared anti-reflection window suitable for a thermal imaging optical path system.
[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0005] An infrared anti-reflection window suitable for a thermal imaging optical path system is designed, comprising an outer frame, a substrate is arranged in the middle of the outer frame, the upper end surface of the outer frame is covered with an upper surface coating, the lower surface of the substrate is covered with a bottom end surface coating, the side wall of the outer frame is covered with a gold-plated side edge, and the upper and lower end surfaces of the outer frame are both covered with a gold-plated film.
[0006] Preferably, the substrate is a YbF3 film layer.
[0007] Preferably, the upper surface coating and the bottom end surface coating are both ZnS films.
[0008] Preferably, the substrate comprises an anti-reflection window, the edge of the anti-reflection window is provided with a window outer edge, and the anti-reflection window protrudes toward the center.
[0009] Preferably, the surface of the outer edge of the window is covered with a heating film.
[0010] Preferably, the outer wall of the outer edge of the window is uniformly provided with a plurality of pores, and the outer wall of the heating film is uniformly provided with through holes, and the through holes coincide with the pores.
[0011] The utility model proposes an infrared anti-reflection window suitable for a thermal imaging optical path system, and has the beneficial effects of: using YbF3 as a base film, and covering the upper and lower surfaces of the YbF3 film with ZnS films, the YbF3 film has unstable physical properties, is easy to peel off and has pits, and the product surface obtained by covering with the ZnS film has no pits, a stable spectrum, and reduces the reflection of the infrared filter, and a heating coating is provided at the same time, when the surface of the anti-reflection window generates fog due to temperature difference, the accumulated moisture flows to the outer edge of the window and flows to the pores, and the heating coating evaporates the moisture by heating, thereby reducing the influence of the fog on the anti-reflection window. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is a front structural schematic diagram of an infrared anti-reflection window suitable for a thermal imaging optical path system proposed by the utility model;
[0013] Figure 2 This is a schematic diagram of the back structure of an infrared anti-reflection window suitable for a thermal imaging optical path system proposed by the utility model.
[0014] In the figure: 1 outer frame, 2 upper surface coating, 3 gold-plated side, 4 bottom end surface coating, 5 gold-plated film, 6 air hole, 7 heating coating, 8 anti-reflection window. DETAILED DESCRIPTION
[0015] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.
[0016] Reference Figure 1-2 An infrared anti-reflection window suitable for a thermal imaging optical path system comprises an outer frame 1, a substrate is arranged in the middle of the outer frame 1, an upper end surface of the outer frame 1 is covered with an upper surface coating 2, a lower surface of the substrate is covered with a bottom end surface coating 4, a side wall of the outer frame 1 is covered with a gold-plated side edge 3, and both upper and lower end surfaces of the outer frame 1 are covered with a gold-plated film 5, the substrate is a YbF3 film layer, the upper surface coating 2 and the bottom end surface coating 4 are both ZnS films, the substrate comprises an anti-reflection window 8, a window outer edge is arranged at the edge of the anti-reflection window 8, the anti-reflection window 8 protrudes toward the center, and the anti-reflection window 8 protrudes toward the center to form a lens structure with the window outer edge.
[0017] The surface of the outer edge of the window is covered with a heating coating 7, and a plurality of pores 6 are evenly formed on the outer wall of the outer edge of the window. Through holes are evenly formed on the outer wall of the heating coating 7, and the through holes coincide with the pores 6. The heating coating 7 can be powered by an external power supply. When fog is generated on the surface of the anti-reflection window 8 due to temperature difference, the accumulated moisture flows to the outer edge of the window and to the pores 6. The heating coating 7 heats the moisture to evaporate, thereby reducing the influence of the fog on the anti-reflection window 8 and further improving the effect of reducing reflection.
[0018] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.
Claims
1. An infrared anti-reflection window suitable for a thermal imaging optical path system, comprising an outer frame (1), characterized in that: A substrate is arranged in the middle of the outer frame (1); the upper end surface of the outer frame (1) is covered with an upper surface coating (2); the lower surface of the substrate is covered with a bottom end surface coating (4); the side wall of the outer frame (1) is covered with a gold-plated side edge (3); and the upper and lower end surfaces of the outer frame (1) are both covered with a gold-plated film (5).
2. The infrared anti-reflection window suitable for a thermal imaging optical path system according to claim 1, characterized in that: The substrate is a YbF3 film layer.
3. The infrared anti-reflection window suitable for a thermal imaging optical path system according to claim 1, characterized in that: The upper surface coating (2) and the bottom end surface coating (4) are both ZnS films.
4. The infrared anti-reflection window suitable for a thermal imaging optical path system according to claim 1, characterized in that: The substrate comprises an anti-reflection window (8), the edge of the anti-reflection window (8) is provided with a window outer edge, and the anti-reflection window (8) protrudes towards the center.
5. The infrared anti-reflection window suitable for a thermal imaging optical path system according to claim 4, characterized in that: The surface of the outer edge of the window is covered with a heating film (7).
6. The infrared anti-reflection window suitable for a thermal imaging optical path system according to claim 4, characterized in that: The outer wall of the outer edge of the window is evenly provided with a plurality of pores (6), and the outer wall of the heating coating (7) is evenly provided with through holes, which overlap with the pores (6).