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Nowadays, a large number of infrared products flood the entire security market, affecting people's choices when buying. Because infrared products are good or bad, besides the company's scale, design, and appearance packaging, even image effects are not necessarily what the eye sees. Because infrared light and the camera image we see are not the same, good is good, clear and clear. However, infrared lamps are different. Some infrared lamps can increase the voltage (because infrared lamps are very sensitive to the supply voltage). The effect will be very good in a short time, but the service life of infrared lamps is greatly shortened. Also six months to a year of life, after a year the failure rate will be significantly increased, the effect will be greatly reduced. There are a lot of infrared light emerging manufacturers see infrared lights in recent years a good profit, find a led seller began to assemble their own infrared light. There are also some early-stage infrared lamp companies that were very dominant in the past. They held huge profits, or sales thoughts a few years ago, and they were constrained by technology. They have been left behind by the rapid development of market competition.
Years ago, at the security exhibition in Shenzhen, I saw a very professional infrared lamp manufacturer, and made a large infrared lamp that resembles a large pot. The nominal number can reach several kilometers. Consult him what kind of camera is supported. What? The kind of lens that can achieve the nominal effect under any circumstances is not clear. So many infrared lamp manufacturers have vowed to mark their infrared lamps 100 meters or 200 meters and so on, thus misleading the contractor. Regardless of how the manufacturers advertise, the contractor is unbelieving. The 100-meter light can barely use 50 meters, and many responsible contractors have also bought countless infrared lamps that do not meet user requirements.
So, the infrared light irradiation distance is the infrared distance monitored at night? Is infrared night vision monitoring a single-finger infrared light technology? Objectively speaking, in order to achieve the effect of infrared light, it is necessary to have a superior infrared camera and an infrared lens with excellent performance. It is best to use an infrared camera with 0.001 Lux or above, preferably in black and white, with a special infrared lens. The infrared transmittance reaches more than 95%. The problem is that most of these cameras are expensive, and lenses with a true infrared transmittance of more than 95 percent are more difficult to find. Therefore, under the premise of not affecting the life expectancy, it is our highest priority to maximize the luminous intensity of infrared lamps within the nominal distance. We demand that even ordinary color to black cameras and ordinary lenses can achieve a Satisfactory results. The following questions are often encountered in the purchase of infrared products:
l Sensitivity problem: Camera sensitivity is a core part of infrared night vision monitoring. The better the sensitivity, the stronger the ability to sense infrared rays. Of course, the better the sensitivity, the more expensive the camera is. In general, infrared night vision systems within 50 meters, the use of 0.1-0.01Lux camera is better; 50 meters to 100 meters of night vision system should use 0.01Lux or lower illumination camera; night more than 100 meters The video system should use 0.001 lux or more cameras. Of course, like many other products, the phenomenon of camera imaginary indicators is also particularly serious, which reminds everyone to choose carefully.
l The problem of distance: simply say to the infrared light, infrared product does not have a certain irradiation distance. We believe that we should still meet the requirements of our customers. The customer's standard is to see clearly! The matching of cameras and lenses in different grades may differ by several tens of times in the sensitivity of the light emitted by the same infrared light. Therefore, the distance of an infrared lamp can only be measured together with a very definite camera and lens to calibrate its working distance. Therefore, in defining the irradiation distance of an infrared lamp, calibration should be based on most commonly used cameras and lenses. This makes sense. In fact, most infrared lamp manufacturers in the market use specific ultra-illuminance cameras to configure fine specific lenses to define the irradiation distance of infrared lamps. This is a natural difference in the practical application of general engineering.
l Red exposure problem: Some manufacturers can make red-free exposure of infrared light as a technical issue to publicize, as if there is a red exposure is low-tech, no red exposure is high technology. In fact, whether there is a red exposure is just a matter of product selection and not a technical issue. As we all know, light with a wavelength of more than 700 nm is called infrared light, infrared light with a wavelength of 900 nm or more is substantially non-red, and the shorter the wavelength in the wavelength range than visible light, the stronger the red exposure. At the same time, the infrared sensitivity of the camera is also higher. Currently, there are two mainstream infrared lamps on the market. One is slightly reddish, and the wavelength is around 850nm. One is without red exposure, and the wavelength is about 940nm. With the same camera, the sensitivity at 850 nm is at least 10 times better than at 940 nm. Therefore, the 850nm infrared lamp with a slight red exposure has a higher luminous efficiency, and has been used as the infrared light source of infrared night vision monitoring.
l Life-time problems: The average service life of a camera can be more than 10 years. Can the life of infrared lamps reach this level? To answer this question correctly, we must first understand the current manufacturing principle of infrared lamps. At present, the infrared light mainly consists of three modes: halogen lamp, multi-chip LED, and single-chip LED. Halogen is a very old technology. It has high energy consumption, amazing heat output, and a short service life. Due to its low efficiency, it is not capable of very long distances. It has now basically withdrawn from the market. Multi-chip led is a speculation of "concept". There are two main types of multi-chip LEDs: one is a "piranha" containing 4 to 8 chips, and the other is an array of light-emitting chips containing 10 to 30 chips. Why do multiple chips? The existing R&D theory is: Infrared light is not irradiated enough because the energy is not enough, more chips are gathered together, of course, the energy is large, it also thinks that the irradiation distance is farther! In fact, this is really a typical amateur technology
Infrared night vision monitoring basic knowledge
With the security monitoring gradually becoming a social demand, the development of security technology has also received more and more attention from all aspects of society. People's requirements for monitoring have gradually developed from the previous visible light monitoring to the direction of no-light monitoring at night. As a result, the selection of night vision infrared products has become a major consideration for contractors when purchasing equipment.