Many infrared lamp manufacturers vowed to claim their own infrared light irradiation distance is 100 meters or 200 meters and so on, also invented the term "foot meters", which misled the engineering firm as if the infrared light has a fixed irradiation distance. Regardless of how the manufacturers advertise, the contractor is unbelieving and believes that a nominal 100 meters infrared lamp can barely use 50 meters.
So does the infrared light have a fixed illumination distance? Infrared night vision surveillance only involves infrared light technology? Numerous facts prove that the answer is no. In fact, there is absolutely no fixed illumination distance for infrared lamps. It is unscientific for any method to mark the irradiation distance of infrared lamps in isolation. There are also fairly professional people and manufacturers who have come to realize that in order to achieve the desired effect of infrared lighting, they need excellent cameras and infrared lenses with excellent performance. The most commonly heard argument is that it requires an infrared-sensing camera of 0.001 Lux or more, preferably black and white; it requires a special infrared lens, and its infrared transmittance reaches more than 95 percent. The problem is that any professional engaged in optical research and manufacturing knows that these so-called lenses with an infrared transmission rate of more than 95 percent really need to achieve 95 percent or more of infrared transmission. The rate is more difficult.
Some manufacturers have been able to create a red-free infrared lamp as a technical issue to publicize, as if there is a red storm is low-tech, red storm-free is high technology. In fact, whether there is a red storm is just a matter of choice and not a technical issue. The light with a wavelength of more than 700 nm is called infrared light, and the infrared light with a wavelength of more than 900 nm has almost no red-storm. The shorter the wavelength is, the stronger the red-storm is, and the higher the infrared-induction sensitivity is. There are currently two mainstream infrared lamps on the market. One is a light red storm with a wavelength of about 850 nm, one with no red storm and a wavelength of about 940 nm. With the same camera, the sensitivity at 850 nm is 10 times better than at 940 nm. Therefore, infrared light with a slight red-storm at 850nm has higher efficiency and should be the first choice for infrared night-vision monitoring.
The service life of the camera can reach more than 10 years. Can the life of the infrared lamp reach this level? Answering this question correctly, we must first understand the principle of the current infrared lamp. At present, there are mainly three modes of infrared light: 1, halogen, 2, multi-chip LED, 3, single-chip LED. Halogen lamps are a more traditional technology, with high energy consumption, large heat generation and short service life. Due to their low use efficiency, they are expected to gradually fade out of the market.
Multi-chip LEDs also come in two forms, one containing 4 to 8 chips; the other is an array of light-emitting chips containing 10 to 30 chips. Why do you need multiple chips? The theory from some manufacturers is that the infrared light is not irradiated enough because the energy is not enough, more chips are gathered together, of course, the energy is large, take it for granted that the irradiation distance is farther. Of course, farther distances require more energy. However, infrared light does not emit much infrared light, and the camera can receive more effective reflected infrared light. Multi-chip LEDs have no light-emitting focus due to their inherent structural disadvantages. The optical system is unreasonable and the useful light efficiency is relatively low (of course, several times stronger than halogen lamps). Its advantages are not fully utilized, such as array-type LEDs, currents As high as 1000mA or more, it is basically only a penny coin size, and heat dissipation becomes a problem.
The most afraid of LED is high fever, not bad it is strange. At the same time, the production requirements of multi-chip LEDs are very strict. Each chip cannot have a slight difference in performance. Otherwise, if one chip is broken, the whole machine is completely finished. In general, the life of multi-chip LEDs is far from enough compared to single-chip LEDs.
Single-chip LED production process is simple, easy to ensure quality, low heat, reasonable optical system is the ideal device for infrared light, the theoretical life of up to 100,000 hours or more. So, isn't the lifespan of all single-chip LED lamps very good? In fact, this is far from the same thing. There are many reasons for this, such as some LED chips are very low level, impurities exceed the standard; some production processes but with leakage phenomenon; some use of super power, rated 20mA, but use more than 50mA; some without protection circuit, or circuit Unreasonable design, these will lead to single-chip LED infrared lamp is broken.
To ensure the longevity of infrared lamps, high-grade LED chips must be selected first. High-grade chips have large power, good consistency, high luminous efficiency, and low heat generation. High-grade LEDs are much better than ordinary LEDs, and they are of course very expensive. Second, the optical system design must be reasonable, the light should be uniform, the utilization rate should be high, and the heat dissipation should be fast. Third, we must strictly control the operating voltage. The LED is very sensitive to voltage, and the LED die will burn off when the voltage is slightly higher, and the amount of light emission will be greatly reduced when the voltage is slightly lower. It is best to match a high quality switching power supply. The AC input voltage is preferably regulated from 170 volts to 270 volts to suit the harsh power supply environment. Fourth, the input power cord is best chosen for high/low temperature, soft, and flexible. There is a manufacturer of infrared light, the input power cord can be used at a temperature of minus 60 degrees and a temperature of 250 degrees above zero.
Whether the infrared light is larger or not, the better the viewing angle, whether it is the manufacturer or the engineering company to take it for granted. They believe that the larger the infrared light emission angle of view, the greater the scope of the lens selection, and the selection of a wide-angle lens does not appear "flashlight" phenomenon . So, everybody is desperate to say how big the perspective of their infrared light is. This seemingly reasonable argument is actually very unscientific.
First of all, there are wasted phenomena when using a large-angle infrared lamp with a small-angle lens. For example, an infrared light emitting angle is 80 degrees (corresponding to the angle of the f3.5mm lens). If the f35mm lens is used, a considerable part of the light will be outside the field of view of the lens, which means that part of the infrared light is wasted. Under normal circumstances, the infrared light's viewing angle is consistent with the lens's viewing angle, and the effect is optimal. The launch angle of the infrared lamp of Changchun Tida is expressed by the focal length of the lens, such as SK-4.2W-16 infrared lamp, 4.2W indicates that the lamp's rated power is 4.2W; 16 indicates the lamp's emission angle and f16mm's The camera angle is the same and both can be matched.
Second, the larger the angle of emission of the infrared light, the better the picture. In some cases, if the infrared light angle is too large, the imaging will be affected. For example, the corridor, because of its "narrow" characteristics, if the infrared light emission angle is too large, the imaging of the near edge will be too bright, forming a "light curtain" phenomenon; far away from the center but can not see, only a whitish phenomenon. Therefore, the infrared light in the corridor should be one-half or one-third of the camera angle.
Third, you can use "light up" technology, two narrow-angle infrared lights with the location and adjust the position, can achieve the effect of wide-angle lights, the market's "Night Hawk" series of infrared night vision system, is the use of "receiving the light" Technology has achieved both long-term and wide-angle. Under the same power conditions, the "light up" technology can double the effect distance.
In general, the problem of the emission angle of the infrared lamp is both a selection problem and a technical problem. Lenses with different focal lengths should choose infrared lamps that are suitable for the angle of emission. The emission angle of the infrared light should not be larger than the angle of view of the lens no matter what kind of conditions, but in the application of the narrow and long environment, it is better to use an infrared light with a smaller or even a third of the lens angle of view. Narrow viewing angle infrared light can achieve ideal wide-angle effect through collocation.
So does the infrared light have a fixed illumination distance? Infrared night vision surveillance only involves infrared light technology? Numerous facts prove that the answer is no. In fact, there is absolutely no fixed illumination distance for infrared lamps. It is unscientific for any method to mark the irradiation distance of infrared lamps in isolation. There are also fairly professional people and manufacturers who have come to realize that in order to achieve the desired effect of infrared lighting, they need excellent cameras and infrared lenses with excellent performance. The most commonly heard argument is that it requires an infrared-sensing camera of 0.001 Lux or more, preferably black and white; it requires a special infrared lens, and its infrared transmittance reaches more than 95 percent. The problem is that any professional engaged in optical research and manufacturing knows that these so-called lenses with an infrared transmission rate of more than 95 percent really need to achieve 95 percent or more of infrared transmission. The rate is more difficult.
Some manufacturers have been able to create a red-free infrared lamp as a technical issue to publicize, as if there is a red storm is low-tech, red storm-free is high technology. In fact, whether there is a red storm is just a matter of choice and not a technical issue. The light with a wavelength of more than 700 nm is called infrared light, and the infrared light with a wavelength of more than 900 nm has almost no red-storm. The shorter the wavelength is, the stronger the red-storm is, and the higher the infrared-induction sensitivity is. There are currently two mainstream infrared lamps on the market. One is a light red storm with a wavelength of about 850 nm, one with no red storm and a wavelength of about 940 nm. With the same camera, the sensitivity at 850 nm is 10 times better than at 940 nm. Therefore, infrared light with a slight red-storm at 850nm has higher efficiency and should be the first choice for infrared night-vision monitoring.
The service life of the camera can reach more than 10 years. Can the life of the infrared lamp reach this level? Answering this question correctly, we must first understand the principle of the current infrared lamp. At present, there are mainly three modes of infrared light: 1, halogen, 2, multi-chip LED, 3, single-chip LED. Halogen lamps are a more traditional technology, with high energy consumption, large heat generation and short service life. Due to their low use efficiency, they are expected to gradually fade out of the market.
Multi-chip LEDs also come in two forms, one containing 4 to 8 chips; the other is an array of light-emitting chips containing 10 to 30 chips. Why do you need multiple chips? The theory from some manufacturers is that the infrared light is not irradiated enough because the energy is not enough, more chips are gathered together, of course, the energy is large, take it for granted that the irradiation distance is farther. Of course, farther distances require more energy. However, infrared light does not emit much infrared light, and the camera can receive more effective reflected infrared light. Multi-chip LEDs have no light-emitting focus due to their inherent structural disadvantages. The optical system is unreasonable and the useful light efficiency is relatively low (of course, several times stronger than halogen lamps). Its advantages are not fully utilized, such as array-type LEDs, currents As high as 1000mA or more, it is basically only a penny coin size, and heat dissipation becomes a problem.
The most afraid of LED is high fever, not bad it is strange. At the same time, the production requirements of multi-chip LEDs are very strict. Each chip cannot have a slight difference in performance. Otherwise, if one chip is broken, the whole machine is completely finished. In general, the life of multi-chip LEDs is far from enough compared to single-chip LEDs.
Single-chip LED production process is simple, easy to ensure quality, low heat, reasonable optical system is the ideal device for infrared light, the theoretical life of up to 100,000 hours or more. So, isn't the lifespan of all single-chip LED lamps very good? In fact, this is far from the same thing. There are many reasons for this, such as some LED chips are very low level, impurities exceed the standard; some production processes but with leakage phenomenon; some use of super power, rated 20mA, but use more than 50mA; some without protection circuit, or circuit Unreasonable design, these will lead to single-chip LED infrared lamp is broken.
To ensure the longevity of infrared lamps, high-grade LED chips must be selected first. High-grade chips have large power, good consistency, high luminous efficiency, and low heat generation. High-grade LEDs are much better than ordinary LEDs, and they are of course very expensive. Second, the optical system design must be reasonable, the light should be uniform, the utilization rate should be high, and the heat dissipation should be fast. Third, we must strictly control the operating voltage. The LED is very sensitive to voltage, and the LED die will burn off when the voltage is slightly higher, and the amount of light emission will be greatly reduced when the voltage is slightly lower. It is best to match a high quality switching power supply. The AC input voltage is preferably regulated from 170 volts to 270 volts to suit the harsh power supply environment. Fourth, the input power cord is best chosen for high/low temperature, soft, and flexible. There is a manufacturer of infrared light, the input power cord can be used at a temperature of minus 60 degrees and a temperature of 250 degrees above zero.
Whether the infrared light is larger or not, the better the viewing angle, whether it is the manufacturer or the engineering company to take it for granted. They believe that the larger the infrared light emission angle of view, the greater the scope of the lens selection, and the selection of a wide-angle lens does not appear "flashlight" phenomenon . So, everybody is desperate to say how big the perspective of their infrared light is. This seemingly reasonable argument is actually very unscientific.
First of all, there are wasted phenomena when using a large-angle infrared lamp with a small-angle lens. For example, an infrared light emitting angle is 80 degrees (corresponding to the angle of the f3.5mm lens). If the f35mm lens is used, a considerable part of the light will be outside the field of view of the lens, which means that part of the infrared light is wasted. Under normal circumstances, the infrared light's viewing angle is consistent with the lens's viewing angle, and the effect is optimal. The launch angle of the infrared lamp of Changchun Tida is expressed by the focal length of the lens, such as SK-4.2W-16 infrared lamp, 4.2W indicates that the lamp's rated power is 4.2W; 16 indicates the lamp's emission angle and f16mm's The camera angle is the same and both can be matched.
Second, the larger the angle of emission of the infrared light, the better the picture. In some cases, if the infrared light angle is too large, the imaging will be affected. For example, the corridor, because of its "narrow" characteristics, if the infrared light emission angle is too large, the imaging of the near edge will be too bright, forming a "light curtain" phenomenon; far away from the center but can not see, only a whitish phenomenon. Therefore, the infrared light in the corridor should be one-half or one-third of the camera angle.
Third, you can use "light up" technology, two narrow-angle infrared lights with the location and adjust the position, can achieve the effect of wide-angle lights, the market's "Night Hawk" series of infrared night vision system, is the use of "receiving the light" Technology has achieved both long-term and wide-angle. Under the same power conditions, the "light up" technology can double the effect distance.
In general, the problem of the emission angle of the infrared lamp is both a selection problem and a technical problem. Lenses with different focal lengths should choose infrared lamps that are suitable for the angle of emission. The emission angle of the infrared light should not be larger than the angle of view of the lens no matter what kind of conditions, but in the application of the narrow and long environment, it is better to use an infrared light with a smaller or even a third of the lens angle of view. Narrow viewing angle infrared light can achieve ideal wide-angle effect through collocation.
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