The simplest configuration of the current infrared system is: high-definition camera, camera lens, infrared light, infrared light power; the high-definition camera referred to here is required to be a low-illumination camera, and the infrared wavelength emitted by the infrared light can be received by the dot-matrix camera. The lens is required to be a night vision lens. The main indicator is the F value. The smaller the F value, the better the night vision effect. The monitoring performance and technical requirements of infrared cameras are also constantly evolving.
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The night vision distance of the night vision system is a comprehensive indicator. Only the camera, lens and infrared light are properly configured to achieve the ideal line of sight. In addition, it is related to the contrast of the observed target. Some people do not regard the night vision distance as A comprehensive indicator of the organism, but only one-sided emphasis on a certain factor, while ignoring other factors, which is impossible in engineering matching equipment.
In practical applications, the accurate statement should be expressed as follows: a surveillance camera with a base illumination of 0.01LX and a resolution of 420TVL, with an 8mm lens with an F value of 1.4, with a 15-meter surveillance camera infrared light, observing people's The clear distance of night vision is 15 meters. Therefore, the night vision distance is a comprehensive indicator. In addition, it should be noted that the color camera cannot be used for night vision because the color filter in front of the color surveillance camera filters out the infrared light, and the CCD cannot be imaged. Experienced equipment manufacturers and contractors generally do not have equipment configuration problems.
However, some engineering companies do not have a comprehensive understanding of the night vision system. Therefore, in the actual project, the problem of unsatisfactory night vision distance often occurs, which causes a lot of trouble for the acceptance of the engineering company. Therefore, it is recommended that the engineering manufacturer purchase night vision equipment. When consulting with the surveillance camera manufacturer, talk about the project site environment and the effect to be achieved, so that the HD camera manufacturer will cooperate with you to make the equipment more reasonable, so that the acceptance will pass smoothly.
Another most common problem is that customers often ask questions about infrared distance. For example, how much is your infrared 40 meters? When you encounter this problem, we always need to patiently communicate with the questioner because of this problem. It is tantamount to saying to the plastic surgeon: How much does it cost for a doctor to get beautiful? Oh, different people, beautiful standards are different, different people, their transformation projects are different; the distance problem of HD cameras is actually An old-fashioned question; to figure out a few factors:
1. The image clarity produced by the HD camera at the minimum illumination is measured by a TV signal test card. The black and white stripes require a black reflectance of approximately 0% and a white reflectance of greater than 89.9%. When we observe it on site, we sometimes don't have such conditions. For example, leaves and grasses and some black things have low reflectivity, and the contrast is small, so it is not easy to obtain clear images. White objects have high reflectivity and contrast is large. It is easy to get a clear image. HD camera is passive infrared; that is, the effect of infrared is not only related to the quality of the infrared light, but also related to the sensation of the CCD, and the reflection intensity of the object being illuminated...that is, the same Surveillance cameras, a person wearing white clothes may see clearly in a hundred meters, while a person wearing black clothes may not see clearly at forty meters;
2. Everyone's standard is also different. Looking at 100 meters clearly means looking at a 100-meter elephant or seeing a chicken? The more likely standard is that the distance between the distance and the actual distance is The difference is that the distance is clear to see that there is a person who can see a figure; the actual distance to see a person means that you can see the outline of a person; there is also a possibility that the difference in subjectivity is also Everyone's eyes are different, subjective feelings are also different, I have customers, the same surveillance camera, some people say that they can see 60 meters, a little people say that they can only see 30 meters;
The objective actual effect of the HD camera is related to the circuit direction, CCD sensor quality, infrared lamp quality, lens and other factors, and also has a certain relationship with the quality of the installed personnel; some problems that can be solved, such as halo, The flashlight phenomenon, in fact, a little attention when installing the machine, can be completely ruled out; In addition, the protective cover also has an effect on the effect of the infrared light, the transmission of infrared light through different media, the transmittance and reflectivity are also different.
Different window glass, especially automatic defrost coated glass, has different attenuation of infrared light.
There are many brands of security equipment, and some equipments are shoddy and the nominals are completely different. The illumination and illumination distance may be based on market needs rather than the actual standard of their own products. You dare to mark 10 meters, I will mark 30 M, you mark the infrared up to 50 meters, I will mark 100 meters; there are customers tell us that there are people 100 meters high-definition camera, and Sony 480 line, the price is less than three hundred dollars. Oh, this is really incredible. Therefore, the engineering manufacturer should not believe that the product is rushed to purchase because of the nominal quantity of the product, and do not buy cheap products. If there is a problem in the project acceptance or post-service, there must be a principle, that is, the equipment to be selected must be tested. The qualified products must be produced by regular manufacturers.
In fact, according to our experience in the production of infrared technology for many years, infrared light is not mysterious. It only emits a single wavelength of light (greater than 80nm), which is more mysterious because it is invisible to the naked eye. The working principle of the infrared lamp is the infrared ray emitted. The CCD smooth sensing of the dot matrix camera is sensitive to this band, so it will produce black and white images. The smaller the F value of the lens, the more light the infrared light enters, thus making the image of the night vision system. Clearer.
The structure of the current infrared lamp currently has two forms: one is a bulb type, and the other is an infrared filter. The infrared lamp generally has a large power, the lamp body consumes a lot of heat, and the maintenance period is short, and needs to be replaced frequently. light bulb. Another kind of infrared lamp uses a semiconductor light-emitting diode, which has high infrared emissivity, low power consumption, small heat of the lamp body, long service life, reasonable price, and wide application range. The night vision distance can reach more than 200 meters. In addition, some surveillance camera manufacturers have specially equipped a protective cover including all-weather for the convenience of user debugging, which is convenient and reliable for users. The development of infrared light to long-distance night vision system is the use of infrared lasers. It is believed that with the development of semiconductor devices, infrared lasers suitable for civilian use will appear. Laser infrared is also the pursuit and development direction of Huaguang infrared series; we believe that laser The use of infrared will make the infrared night vision system a breakthrough development.
In short, the application of infrared night vision camera system is more and more extensive, and its role is obvious to all. I hope that domestic infrared night vision equipment manufacturers will work with us to have greater development in infrared, not only can create famous brands in China. Also, strive to get out of the country as soon as possible, occupying a sky in the same industry.
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