Infrared Lens is a rising technology with a limited range of applications. However, with the trend in security, Infrared Lens will rapidly expand.
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Infrared lens uses special optical glass materials and modern optical design methods to eliminate the focus shift between visible light and infrared light, allowing both types of light to be imaged at the same focus point for a clear image. Currently, Infrared cameras on the market mainly use an infrared filter to switch between day and night modes. During the day, the filter blocks infrared light from reaching the CCD, enabling it to detect only visible light. At night or under poor lighting conditions, the filter stops working, allowing infrared light, reflected from objects, to enter the lens and be imaged by the CCD.
However, commonly a clear daytime image becomes blurry under Infrared conditions. This is because the wavelengths of visible and infrared light differ, causing the focus point to be different which results in a blurry image. The latest optical design methods, special optical glass materials, coatings, and advanced materials eliminate the focus shift between visible and infrared light. The special optical glass material addresses the clarity issue of infrared imaging, allowing light to be focused at the same point for both visible and infrared light. Special coatings ensure that infrared light penetrates the lens while suppressing ghosting and flares in backlit conditions, providing high-quality images with high contrast, even under unfavorable backlight conditions.
Infrared Lens has a wide range of applications. It can be used as a specialized lens for Infrared purposes or as a regular lens. Infrared lenses can be easily synchronized with conventional color cameras, white cameras, and day-to-night switchable cameras, depending on the application. White cameras do not have an infrared stop filter, and the sunlight spectrum contains infrared light, so even under daylight conditions, white cameras can be affected by infrared light. Therefore, using an Infrared Lens can significantly improve image quality.
The lens is an indispensable part of the infrared thermal imager. Its function is to converge the infrared radiation of the target on the infrared detector, and through photoelectric conversion and image processing, it finally forms an image with good contrast. The quality of the infrared lens largely determines the performance of the infrared camera.
1. Band
The infrared lens should be specially designed according to its working band to optimize its performance. The infrared materials used in the infrared lenses of different bands are also different.
2. Vignetting
Generally speaking, infrared lenses do not allow vignetting. For the lens used in the infrared cooling detector, if the lens has vignetting, it cannot meet the 100% cold diaphragm efficiency design principle, and stray radiation will affect the performance of the infrared thermal imager.
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3. Focal length and field of view
An infrared lens is usually identified by its focal length. As the focal length increases, the field of view of the lens narrows. Conversely, as the focal length decreases, the field of view becomes wider.
Infrared lenses can generally be divided into single-field lenses, multi-field lenses, and continuous zoom lenses. Since the infrared continuous zoom lens can realize target search and continuous tracking of targets at different distances, it has been widely used in many fields.
4. F number
The F number of the infrared lens determines how much the target radiant energy enters the infrared thermal imager. The smaller the F number, the larger the size of the infrared lens under the same focal length.
5. Transmittance
Most infrared materials have a high refractive index, and the lens in the infrared lens needs to be coated with a high-efficiency antireflection coating to increase the transmittance of the infrared lens. As the number of lenses in the lens increases, the transmittance of the lens gradually decreases.
6. No heating
Since the refractive index of infrared materials varies greatly with temperature, when the ambient temperature changes, the infrared lens will produce a corresponding defocus. The infrared lens also adopts two methods of active and passive to achieve athermalization to ensure that the focal position of the lens does not move when the temperature changes.
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