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          迪奧科技標語
          The role and precautions of LED light sources in vision systems
          Author:Administrator   Published in:2019-12-24 14:50

          Machine vision system is mainly composed of three parts: image acquisition, image processing and analysis, output or display. The image acquisition is the core of machine vision, and the image acquisition system is composed of three parts: light source, lens and camera. The selection and lighting of the light source can directly affect the imaging quality of at least 30%. So the light source is a very important part of the machine vision system. What it can do in machine vision systems:

          1. Illuminate the target, increase the target brightness,

          2. Highlight measurement features and simplify image processing algorithms;

          3. Overcome the interference of ambient light, ensure the stability of the image, and improve the signal-to-noise ratio of the image;

          4. Improve the positioning, measurement and recognition accuracy of the vision system, and the speed of the system;

          5. Reduce the complexity of system design and form the imaging effect that is most conducive to image processing;

          Whether the LED light source lamp works stably and with good quality is very important for the heat dissipation of the lamp body itself. At present, the heat dissipation of high-brightness LED light source lamps on the market often uses natural heat dissipation, and the effect is not ideal. If the LED light source does not dissipate heat well, its life will be affected. Therefore, pay attention to the following points when using LED light sources:

          1.The influence of heat on high-brightness LED light source

          The heat is concentrated in a chip with a small size, and the temperature of the chip rises, which causes a non-uniform distribution of thermal stress, the chip's luminous efficiency and the luminescent efficiency of the phosphor drop; when the temperature exceeds a certain value, the device failure rate increases exponentially. Statistics show that every 2 ° C increase in component temperature reduces reliability by 10%. When multiple LED light sources are densely arranged to form a white light lighting system, the heat dissipation problem is more serious. Solving the problem of heat management has become the primary condition for the application of high-brightness LED light sources.

          2.Relationship between chip size and heat dissipation

          The most direct way to increase the brightness of a power LED light source is to increase the input power, and in order to prevent saturation of the active layer, the size of the pn junction must be increased accordingly; increasing the input power will necessarily increase the junction temperature and then reduce the quantum efficiency. . The increase in the power of a single tube depends on the device's ability to extract heat from the pn junction. Under the existing chip material, structure, packaging process, constant current density on the chip, and equivalent heat dissipation conditions, the size of the chip alone is increased, and the junction area is increased. The temperature will keep rising.

          3. Thermal management is a major issue in the application of high-brightness LED light sources

          Because the p-type doping of the III-nitride is limited by the solubility of the Mg acceptor and the higher activation energy of the holes, heat is particularly easily generated in the p-type region, and this heat must be dissipated on the heat sink through the entire structure; The heat dissipation path of LED devices is mainly heat conduction and convection. The extremely low thermal conductivity of the Sapphire substrate material results in an increase in the thermal resistance of the device, resulting in a serious self-heating effect, which has a devastating effect on the performance and reliability of the device.

          The above is the role of the LED light source in the vision system and the matters needing attention. If you want to know more about the machine vision system, welcome to pay attention to our TEO technology.


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          亚洲国产剧情中文视频在线
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