Infrared night vision camera technology is divided into passive infrared camera technology and active infrared camera technology.
Passive infrared camera technology uses the principle that any substance emits infrared light above absolute zero (-273°C). The infrared light emitted by the human body and the heat engine is strong, and the infrared light emitted by other objects is relatively weak, using special thermal infrared night vision. Instrument can achieve night monitoring. However, this special thermal infrared night vision instrument is expensive, and it cannot intuitively and clearly reflect the surrounding environment, so it is less commonly used in normal night vision systems.
Active infrared camera technology, which uses infrared lamps to generate infrared radiation and emits infrared light that is invisible to the human eye to illuminate the scene and the environment, can use ordinary low-light-rate CCD black-and-white cameras or "daytime color nighttime automatic black and white" cameras or "infrared Low-light color camera "to feel the infrared light reflected from the surrounding scenery, so as to achieve night vision.
The basic configuration of the infrared camera system at this stage is: camera, lens, infrared lamp, infrared lamp power supply and so on. The camera here refers to a low-light camera, and the infrared light emitted by the infrared lamp can be received by the camera. The lens is also required to be able to sense infrared light. The smaller the main index F (light amount) is, the better the night vision effect is.
The quality of the camera has a direct relationship with the proper selection of the camera and its associated devices.
The camera sensitivity is the brightness value of the scene when the camera's output video signal level is low to a certain value when the brightness of the subject is low to a certain extent. The higher the camera's sensitivity, the weaker light sensing capability. The stronger. Of course, the better the sensitivity, the more expensive the camera is. Some camera manufacturers, at random, improve the output signal strength, the sensitivity is good, but the signal-to-noise ratio is poor, resulting in a lot of images "snow spots", like bad quality.
Cameras of different specifications of the CCD will greatly affect the image of the infrared camera. Current CCD camera specifications are 1/2", 1/3", 1/4". The luminous flux of l/3" CCD is 44% of 1/2" CCD, and the luminous flux of 1/4" CCD is 1/3" CCD. At 50%, visible 1/2" video cameras have the best image at night, so different camera sizes can be selected based on different environments and monitoring requirements.
All infrared night vision cameras are infrared-sensing. Infrared light is a kind of stray light for the camera in the visible light condition, which will reduce the clarity and color reproduction of the camera. The color camera's filter is to prevent infrared rays from participating in imaging. To make the color camera sense infrared, there are two methods. First, switch the filter to block the infrared light from entering in the visible light condition. Second, remove the filter from the visible light and let the infrared light enter. The program image quality is good.
Passive infrared camera technology uses the principle that any substance emits infrared light above absolute zero (-273°C). The infrared light emitted by the human body and the heat engine is strong, and the infrared light emitted by other objects is relatively weak, using special thermal infrared night vision. Instrument can achieve night monitoring. However, this special thermal infrared night vision instrument is expensive, and it cannot intuitively and clearly reflect the surrounding environment, so it is less commonly used in normal night vision systems.
Active infrared camera technology, which uses infrared lamps to generate infrared radiation and emits infrared light that is invisible to the human eye to illuminate the scene and the environment, can use ordinary low-light-rate CCD black-and-white cameras or "daytime color nighttime automatic black and white" cameras or "infrared Low-light color camera "to feel the infrared light reflected from the surrounding scenery, so as to achieve night vision.
The basic configuration of the infrared camera system at this stage is: camera, lens, infrared lamp, infrared lamp power supply and so on. The camera here refers to a low-light camera, and the infrared light emitted by the infrared lamp can be received by the camera. The lens is also required to be able to sense infrared light. The smaller the main index F (light amount) is, the better the night vision effect is.
The quality of the camera has a direct relationship with the proper selection of the camera and its associated devices.
The camera sensitivity is the brightness value of the scene when the camera's output video signal level is low to a certain value when the brightness of the subject is low to a certain extent. The higher the camera's sensitivity, the weaker light sensing capability. The stronger. Of course, the better the sensitivity, the more expensive the camera is. Some camera manufacturers, at random, improve the output signal strength, the sensitivity is good, but the signal-to-noise ratio is poor, resulting in a lot of images "snow spots", like bad quality.
Cameras of different specifications of the CCD will greatly affect the image of the infrared camera. Current CCD camera specifications are 1/2", 1/3", 1/4". The luminous flux of l/3" CCD is 44% of 1/2" CCD, and the luminous flux of 1/4" CCD is 1/3" CCD. At 50%, visible 1/2" video cameras have the best image at night, so different camera sizes can be selected based on different environments and monitoring requirements.
All infrared night vision cameras are infrared-sensing. Infrared light is a kind of stray light for the camera in the visible light condition, which will reduce the clarity and color reproduction of the camera. The color camera's filter is to prevent infrared rays from participating in imaging. To make the color camera sense infrared, there are two methods. First, switch the filter to block the infrared light from entering in the visible light condition. Second, remove the filter from the visible light and let the infrared light enter. The program image quality is good.
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