Why is the endoscope light source LED a cold light source
The luminous flux of a light source is related to its luminous efficiency and power consumption. The same kind of light source consumes high power and its luminous flux is large; consuming the same power, the luminous flux generated by different types of light sources is due to energy conversion, that is, the luminous flux produced by different luminous efficiency different
Therefore, it is meaningful to compare the luminous efficiency of different light sources in actual comparison: Approximate data on the luminous efficiency of several common light sources: Incandescent lamps and halogen lamps are 12-24 lumens per watt, and halogen lamps have higher luminous efficiency because of higher filament temperature. Ordinary incandescent lamps are high; fluorescent lamps and HID lamps (gas discharge lamps) are 50-120 lumens/watt; while LED lamps are currently around 110 lumens/watt; The light source of the laser machine is a semiconductor laser, also known as LD. The laser is indeed unidirectional, but the monochromaticity of the semiconductor laser is the worst.
Generally, the divergence angle of other lasers is less than one degree. So you need a lens to focus. Semiconductor focus, you just need to add a lens to the front to focus, but the general light source, because it wants to emit around, there is also light emitted back, so it must be controlled by a concave mirror. The light emitted backward is emitted to the front, just like a flashlight. Simply put, one is an emitting lens and the other is a lens. That is modulated light. Pay attention to the luminous power. If the light source is not too large, it will not work. Set the pulse width to the maximum and set the average time longer. A large reflection will be seen on the OTDR, and the optical power reading may be unstable. Without light source means that the light source needs to be quoted separately. Or some customers are willing to purchase lamps from one company and light sources from another. Give customers more choices. Now the regular brands in the lighting industry, such as Oufan Lighting, use this mode of operation, which is more scientific. Some small workshops buy lights and send light sources, and the quality of those light sources is not guaranteed.
