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Three infrared lamp technology analysis
First, LED infrared light LED infrared light consists of infrared light diode matrix luminous body. The infrared emitting diode is made of a material with high infrared radiation efficiency and made of a PN junction. A forward bias voltage is applied to the PN junction to inject infrared light. The infrared camera produced by using this technology is known for its low manufacturing cost and low technical threshold. At present, most security manufacturers have chosen to use it.
Manufacturers and users of this type of technology all know that the LED infrared light irradiation distance, long-term use of heat dissipation, infrared lamp life, monitoring the screen brightness is not uniform, and so has always troubled everyone's problems. At the same time, the application of this infrared technology also has certain limitations. The technology is mainly based on indoor environmental monitoring and outdoor short-range, such as some indoor channels, corridors, rooms, warehouses, etc., such as outdoor short-distance trunk roads, corridors, intersections, Entrances and exits are more suitable for smaller and shorter surveillance areas. The performance of LED infrared lamps in these areas can be accepted by the user. To a certain extent, they can also replace the ultra-low illumination camera to achieve night surveillance.
Although many infrared LED manufacturers have improved, life expectancy and the single LED's irradiation distance has greatly improved, but it is still far from meeting the current monitoring needs, so it will eventually escape the fate of being eliminated.
Second, the array infrared light array LED infrared technology based on the original LED infrared technology, using advanced packaging technology, will dozens of high power, high efficiency infrared crystal original packaged in a plane. The appearance of the array infrared lamp compensates for the defects of the LED, and improves the current status of the LED having a short service life, a short infrared night vision distance, and an unfavorable infrared effect. Especially at night surveillance sites with medium and short distances ranging from tens of meters to 100 meters, and monitoring sites with wider monitoring areas, such as road monitoring, factories, communities, prison walls, relatively open spaces, sports stadiums, etc., in safe cities. .
Using this infrared technology, both the illumination distance and the brightness uniformity of the picture are improved compared to the LEDs. In terms of the irradiation distance, the optical output of an array type infrared lamp can reach about 2W, which is equivalent to the brightness of the traditional 200 LED, and it can really achieve an outdoor irradiation distance of more than 100 meters; in terms of the brightness of the screen Because the original half-power angle of the array-type infrared lamp luminous body is about 150°, different angles can be changed by optical means, and the luminous angle can be large or small, so that the illumination beam is evenly irradiated on the target object, so that the brightness of the entire screen is uniform.
In addition, the array type infrared lamp also has a great improvement in the service life. The integrated body of the array type infrared lamp is made of metal and has good heat dissipation and is easy to maintain low temperature during operation. Although the technology has been gradually promoted in the market, due to the high cost, it has affected the pace of advancement of this type of product to a certain extent. With the significant reduction in production costs, the technology should gradually become popular in the next one to two years.
Third, the laser infrared lamp Laser infrared lamp belongs to the semiconductor laser, is the use of semiconductor materials in the hole and the electron recombination process, as well as the reduction of electron energy levels to release electrons to generate light energy, and then the photon in the resonance specification photon propagation direction Laser formation. The laser has a good directionality, which is characterized by a small beam angle, energy concentration, and sufficient light intensity to travel farther, making it ideal for long-distance lighting.
The distance between conventional products is 100-500 meters and the maximum distance is 3,000 meters. Want to monitor the reality of long-distance will need to adopt new technologies, that is, infrared laser night vision technology, such as large-scale environmental monitoring, forest fire prevention, scenic spot monitoring, port terminal monitoring, oilfield monitoring, etc. These areas are mainly characterized by long monitoring distance , It is generally several hundred meters or even one to two kilometers. The monitoring range is relatively large and the risk factor is high. The introduction of laser infrared lamp technology can completely solve the problem of remote night surveillance and achieve long-distance radiation. For monitoring purposes. The laser infrared lamp's production process is not like the LED infrared lamp, and its production process requires very high. At the same time, the production of laser infrared lamps requires a huge investment, which is something that ordinary manufacturers cannot accomplish. The production of laser infrared technology needs to be improved, and the production of finished products needs to be reduced. With the advancement of the market, laser infrared lamps will be as popular as LED infrared lamps in the next three to five years. It will eventually become mainstream infrared night vision products.
Infrared lamp quality identification method
First, the distinction between positive and negative cores The use of positive or negative cores determines the quality of infrared lamps. The price between the two is also very different, even a difference of more than five times. This is also the price of infrared lamps in the market. An important reason. The camera is most sensitive to the luminescence spectrum at 850 nanometers of the lamp, that is, a red burst infrared tube. The infrared tube of this band is also the most expensive. Remove the lamp plate of the infrared lamp and find an adjustable power supply. In the dark environment, the output voltage of the regulated power supply is first adjusted to the rated working voltage of the infrared lamp, and the infrared lamp is connected. At this time, the infrared lamp works normally, and then the voltage is gradually lowered until the lamp tube goes out and the lamp is turned off. The degree of luminosity is the same. If all the lamps on the lamp panel are illuminated during this process, then the lamp is using a positive core; if there are any lamps that are slightly bright and the lamps are slightly darker, then the quality of the wick makes people doubtful. . There is also a method of measurement. The operating voltage of each lamp is measured while the infrared lamp is operating normally. Most LED infrared lamps currently on the market use low-power lamps. The chips are mostly 12MIL or 14MIL [mil = 0.0254 millimeters (mm)]. The normal working voltage of each lamp is about 1.5V. .
With a digital multimeter, range switch to 2V file, measuring the working voltage of each lamp, if the positive core tube, the error value of the working voltage of each lamp within 0.03V, if greater than this value, especially the general comparison When it was large, it indicated that the lamps were not positive. This method is also suitable for 940 nm infrared lamps.
The advantages of a positive core tube are that it works stably. When it is new, it is as new as it is. It is as old as it used to be. After working for 35 years, the lamps on the lamp panel are seen again. They are very consistent. If the suspicion is low, proper adjustment of the operating current can make it rejuvenate. Dispersing the lamp is not the same. After six months of operation, some lamps on the lamp board are dark and there is no failure within one year. Even if you replace the bad pipe, it will still fail after a long time, because the overall quality is too bad.
Second, the size of the wick chip The normal method is to use chemical solvents to measure the size of the wick after the colloid dissolved. But for most people, even if you can dissolve the colloids, you cannot measure accurate data because we don't have a very accurate measurement tool [1 mil = 0.0254 mm]. It is usually to see the operating current. In general, the maximum operating current for a 12 MIL lamp is no more than 60 mA, and no more than 70 mA for 14 MIL. However, due to the market and other factors, some of the all-in-one 12MIL lamps have 80 mA operating current. This method is not sure. But we can provide a reference, that is, the operating current of the chip may be large, but the current is too short life. For example, the operating current of a lamp of 12MIL is 80 mA, and its lifetime is at most 2 years. You know this, you can have more plates on hand. Anyway, if you buy a lamp for one time, you have to make a profit for sales and engineering. Everyone is happy.
Third, look at the process to see the process is like looking at a person, if a person is wearing a ball, it is difficult to inform his work will be serious (except for Mr. Chen Jingrun, of course). The quality of the process, to a certain extent, explains the quality of the product, especially the welding process. The lamp welding time requirement is less than 1.5 seconds. Too long welding time will directly affect the lamp life. This point we have been identified during the trial.
Fourth, other aspects of the stability of infrared lamps from the working voltage.
Observing the light board carefully, we can easily find that several light tubes on the light board are connected in series, and then these several groups are connected in parallel to form the entire light board circuit. If there is a problem with one of the lamps in each group of lamps, the group of lamps will be off. Most of the current lamp on the market has a working voltage of 12V and some are 24V. The 12V lamp is mostly a group of 6 to 7 lamps connected in series, and 24V is 14 or 15 are connected in series. It is also a faulty lamp. The number of inactive lamps with high voltage is much larger than that of low voltage lamp. That is, the lamp with a low operating voltage has a higher stability.
The quality of infrared lamps depends mainly on two aspects, in addition to the LED infrared diode is the power supply. The vast majority of infrared lamps are installed in high places. Once a problem arises, the contractor first picks up the trouble, and then the contractor finds the seller and the seller finds the manufacturer again; the profit of the seller is low, and the goods are picked up and shipped back and forth. The last light may not necessarily make money and may lose money. So the quality of power is very important!
5. Array-type infrared lamps Array-type infrared lamps are actually focused on a number of infrared LED chips on a substrate, the internal lines of which are the same as ordinary LED infrared lamps. Array infrared lamps must pay attention to the cooling measures. The back of the good-quality array infrared lamp has a thick heat sink, and thermal grease is also coated between the array substrate and the heat sink to facilitate heat dissipation.
Array-type infrared lamps have the advantages of small size and light weight, but they also have their shortcomings. Because they are also connected in series after the first parallel line, once a chip is damaged will result in a group of lights do not work, and can not replace this damaged chip.
If the number of damaged groups is large, the entire substrate must be replaced, and the maintenance cost is relatively high.
Six. About high-power infrared light High-power infrared light (piranha package) is the most important thing is to heat, light board with aluminum substrate, and through the screw connection with the chassis, through the shell heat. In addition, many built-in fans, through the forced air cooling to increase the heat exchange between the lamp and the shell. If you use an ordinary circuit board, you can conclude that the quality of this light board is certainly not high, and the life expectancy is certainly not long.
Seven. About the life of infrared lamps Manufacturers generally have a nominal life of 25,000 hours. The actual life is related to the lamp's production process, circuit design, power quality, and work environment.
Infrared lamp technology classification and quality identification method
With the rapid development of infrared night vision systems, infrared lamp production and supply manufacturers will also increase, but red light products are not as easy as some people think, and conditions are different in technology, testing equipment and other aspects. When using, the user should not arbitrarily increase the power supply voltage, because the design of the infrared lamp is not only taking into full consideration of its irradiance, but also taking into account its safety and reliability.