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Talking about the use of infrared cameras
Infrared cameras are not only capable of performing well in low indoor lighting conditions, but they also meet international energy-saving standards. Because of these advantages, they are widely used in both indoor and outdoor environments. However, when using them in real-world scenarios, there are several important considerations to keep in mind.
One key issue is the angle of the infrared light. Using a wide-angle infrared light with a lens that has a narrow field of view can lead to wasted light. Additionally, the position of the infrared light emission point greatly affects image quality—ideally, it should be aligned properly for optimal performance.
Another factor is the amount of light passing through the lens. The relative aperture determines the lens’s light transmission capability. For example, a lens with an f/1.0 aperture allows four times more light than one with an f/2.0 aperture. When paired with the same camera and infrared lamp, this difference can double the effective infrared range. High-aperture lenses offer significantly better performance in infrared monitoring compared to standard lenses, making them essential for night vision systems. However, due to high costs and technical challenges, most manufacturers do not offer such lenses.
Focus shift is another common problem. Since visible light and infrared light have different wavelengths, their focal points may not align, leading to blurry images at night or during the day. This issue can be resolved in three ways: using a camera with automatic focusing, employing a specialized lens that minimizes focus shift, or utilizing professional adjustment tools to fine-tune the setup.
Color-related issues also arise. Black-and-white cameras are highly sensitive to infrared light, while color cameras treat it as stray light, which can reduce resolution and color accuracy. Color cameras typically use filters to block infrared light during the day. There are two approaches for infrared imaging: either switch the filter to block infrared during the day and remove it at night, or modify the filter to allow specific infrared wavelengths to pass through. The first method provides better image quality but increases cost and failure risk, while the second is more cost-effective but slightly compromises color reproduction.
How far can an infrared camera see? In the hands of experts—those who master infrared light technology, infrared sensor camera technology, and infrared lens technology—it's possible to achieve over 100 meters of night vision. While commercial products now support ranges beyond 500 meters, the cost remains high, limiting widespread use in the civilian market.