With the increasing demand for night vision surveillance in security video surveillance system engineering, infrared cameras with LED light source applications have entered the mainstream market of cameras, and sales are increasing. This paper discusses the application of LED infrared light source in the night vision technology of cameras.
LED infrared light source purchase
The infrared infrared camera's LED infrared light projection is just like a flashlight. When the projection angle is small, the projection distance is far, but the monitoring range will be smaller, and vice versa. At present, most of the domestic infrared cameras with good quality are mostly LED infrared lamp modules produced by Taiwanese manufacturers, such as Ding Yuan, Hong Wei, and Guang Bao. In the minds of most users, it is believed that the amount of LED infrared light determines the quality of the infrared surveillance camera, but in fact, this view is not very accurate. At present, the LED infrared light of the infrared surveillance camera on the market has two external or built-in design methods. The size and power of the LED will affect the detection distance of the camera. For example, the space of the built-in LED light is small, so the monitoring distance is also Shorter. Industry experts pointed out that the power of infrared LED lights is the key to directly affecting the illumination distance of infrared surveillance cameras.
At the same time, in order to achieve the best results, the design of the LED light assembly, the combination of the LED light and the lens is also very important. In order to enhance the essential functions of the infrared surveillance camera, the LED infrared lamp should be carefully selected first. Only high power and low current will not overheat the LED. Secondly, the aluminum substrate with better heat dissipation is selected to prevent the general glass fiber substrate from being produced. In order to dissipate the fan for heat dissipation, it causes problems such as poor waterproofing, fogging and dust. The third is to prevent the exposure problem of the infrared surveillance camera. The reflection of the LED infrared lamp must be fundamentally solved. It can be installed between the LED lamp and the lens. Metal partitions are isolated to prevent interference from LED lighting; in addition, in order to prevent fogging, it is necessary to strengthen the waterproof problem of the infrared surveillance camera; finally, it is focusing on the problem, usually the infrared surveillance camera is in normal focus during the day, but it is At night, it is often impossible to focus normally, which must be dependent on the technical improvement of the ED glass inside the lens.
How to reduce the attenuation of the illumination distance of the infrared lamp as much as possible and prolong the service life of the infrared monitoring product is also an important issue. In the interview, Hikvision's Hu Ping said that the following methods can be used to achieve this goal: high-quality infrared lamps; metal film reflective technology; high-efficiency optical lenses (5% higher than ordinary glass) Light transmittance); maintain constant current and constant voltage circuit design to ensure that the light source works in a stable current state; use LED circuit protection system; each group of infrared lamps is powered separately to avoid vicious cycle of current, even if single lamp is damaged, it will not cause all lamps Failure; multiple designs can be used to ensure the life of the IR lamp and so on.
LED infrared light source application analysis
The infrared LED used in the remote control, because the light emitted by the infrared LED is not completely infrared light, but also contains part of the visible (red) component, so the naked eye can see a little light. The LED used in the remote control generally has an emission angle of about 30 degrees, and the user can operate effectively even if the target is not completely aligned.
When there is no external infrared interference, the remote control distance can reach 5 meters or more. However, due to the presence of infrared light in natural light, the distance is generally within 3 meters. Of course, increasing the transmit power of the remote control can increase the remote control distance. In theory, the transmit power is increased by 100% and the remote control distance is increased by 40%.
The camera used for monitoring is also an infrared LED. Personally, most people use a product similar to the remote control. The camera's sensitive range includes the infrared area, so using infrared LED illumination allows the camera to get a clear image. The effective distance of a single LED illumination is generally no more than 2 meters, and at this distance, the brightness is already very low. Therefore, the common monitoring uses multiple LEDs side by side. The more LEDs, the farther the effective range is, and the same is about 100%-40%.
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