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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 global energy-saving standards. Because of these advantages, they are widely used in both indoor and outdoor environments. However, when it comes to actual usage, 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 direction of the infrared emission matters—placing the infrared source in the optimal position will result in a clearer image.
Another important factor is the amount of light that passes through the lens. The relative aperture determines the lens’s light-gathering capability. For example, a lens with an f/1.0 aperture allows four times more light than an f/2.0 lens. When paired with the same camera and infrared light, this difference can double the effective range of the infrared system. Large-aperture lenses offer significantly better performance in infrared monitoring compared to standard lenses, often up to four to ten times better. This makes infrared night vision systems essential, but due to high costs and technical challenges, most manufacturers do not offer them as standard products.
Focus shift is another common problem. Since visible light and infrared light have different wavelengths, their focal points may not align, causing images to be sharp during the day but blurry at night, or vice versa. There are three main solutions: using a camera with automatic focus, employing a specialized lens that minimizes focus shift, or using professional adjustment tools to fine-tune the focus under existing lens setups.
Color issues also arise when using color cameras for infrared imaging. While black-and-white cameras are highly sensitive to infrared light, color cameras typically have filters that block infrared light under normal lighting conditions. This can reduce resolution and color accuracy. To address this, two methods are commonly used. One involves switching filters to block infrared light during the day and remove them at night, which improves image quality but increases cost and potential failure risk. The second method uses a filter with a specific infrared channel that allows only the desired wavelength to pass, keeping costs lower but slightly affecting color reproduction.
How far can an infrared camera monitor? In professional settings, systems capable of detecting objects over 100 meters away are now common. "Professional technology" refers to the integration of infrared light technology, infrared sensor camera technology, and infrared lens technology—all essential components. Today, commercial products can reach over 500 meters, though they come at a higher cost and are still mainly used in specialized markets rather than by the general public.