Since its introduction, infrared cameras have taken advantage of their long-range night vision, concealment, and stable performance, and have captured most of the market in night-vision surveillance.
Before talking about infrared cameras, let's talk about basic knowledge. The visible light has a wavelength of 0.4 to 0.7 μm, which is the light that the eye can see. The 0.7- to 400-micron segment is infrared, which is invisible light beyond what the human eye can see. In addition, any object that emits infrared rays of thermal radiation will emit its own light above absolute zero, and objects emitting heat such as the human body will be larger than those emitted from houses, trees, and stones.
The camera's sensor CCD or CMOS, also commonly referred to as "Sensor", is a semiconductor device that converts an optical image into a digital signal. However, as far as the eye is concerned, it can sense some invisible light such as infrared light. The sensor has an index sensitivity. , Also known as the minimum illumination value, is the ability to respond to weak light, the higher the sensitivity, the stronger the ability to sense light, the stronger the ability to sense infrared.
Since the sensor can sense infrared rays, during the daytime, the infrared rays in the light also enter the sensor, which may cause the overall image to become reddish. Therefore, ordinary cameras have filters attached to the sensor surface to filter out infrared rays in the light. If the infrared camera is also affixed with such a filter, the infrared rays actively emitted by the infrared light of the camera at night will also be filtered out, resulting in the failure of the infrared lamp. In order to avoid this situation, high-end infrared cameras are generally equipped with dual filters, that is, infrared filters are turned on during the day to filter out infrared rays in the light, infrared filters are turned off at night, and fill infrared light enters images through the lens.
These are the reasons why infrared cameras can clearly image at night that people cannot see. Depending on the infrared camera sensor's ability to perceive infrared light, in the nighttime environment where the light is relatively poor, infrared light or infrared heat radiation of the object is used to achieve night vision, and double filters are used to ensure that the images in the daytime are not color cast.
Before talking about infrared cameras, let's talk about basic knowledge. The visible light has a wavelength of 0.4 to 0.7 μm, which is the light that the eye can see. The 0.7- to 400-micron segment is infrared, which is invisible light beyond what the human eye can see. In addition, any object that emits infrared rays of thermal radiation will emit its own light above absolute zero, and objects emitting heat such as the human body will be larger than those emitted from houses, trees, and stones.
The camera's sensor CCD or CMOS, also commonly referred to as "Sensor", is a semiconductor device that converts an optical image into a digital signal. However, as far as the eye is concerned, it can sense some invisible light such as infrared light. The sensor has an index sensitivity. , Also known as the minimum illumination value, is the ability to respond to weak light, the higher the sensitivity, the stronger the ability to sense light, the stronger the ability to sense infrared.
Since the sensor can sense infrared rays, during the daytime, the infrared rays in the light also enter the sensor, which may cause the overall image to become reddish. Therefore, ordinary cameras have filters attached to the sensor surface to filter out infrared rays in the light. If the infrared camera is also affixed with such a filter, the infrared rays actively emitted by the infrared light of the camera at night will also be filtered out, resulting in the failure of the infrared lamp. In order to avoid this situation, high-end infrared cameras are generally equipped with dual filters, that is, infrared filters are turned on during the day to filter out infrared rays in the light, infrared filters are turned off at night, and fill infrared light enters images through the lens.
These are the reasons why infrared cameras can clearly image at night that people cannot see. Depending on the infrared camera sensor's ability to perceive infrared light, in the nighttime environment where the light is relatively poor, infrared light or infrared heat radiation of the object is used to achieve night vision, and double filters are used to ensure that the images in the daytime are not color cast.
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