Most of the laser industry is used in high-end precision machinery, aerospace industry, and precision instruments. How to maintain it has become an important issue. The chiller has great applications in the laser industry.
Laser chiller not only protects CO2 laser tube, YAG solid-state laser crystal and lamp tube during laser processing ; full and constant laser cavity temperature is guaranteed by laser output power stability, laser cavity without thermal deformation, laser beam quality and so on. . Choosing the right laser cooling system can greatly improve the life and processing accuracy of the laser, and maximize the performance of the laser equipment. However, most users and manufacturers in the selection and recommendation of laser cooling system are often very vague concept, many laser chillers on the market are also unclear indicators, user equipment is also with the flow, can not accurately make reasonable use of the laser equipment used protection. Several indicators mentioned below are critical to the choice of laser chillers :
Cooling capacity
a. As the name suggests, the actual cooling capacity of the cooling system is the first indicator of laser cooling equipment selection.
b. Generally, we can calculate the calorific value of the laser according to the photoelectric conversion efficiency of the laser, and then choose.
P heat = P laser / μ
Assuming that the thermal efficiency μ of the glass tube CO2 laser is generally 15% , the 80W laser requires a minimum of 80/0.15 = 533W.
That is to say, while generating an 80W laser, the laser injects 533W of energy, and the ineffective energy needs to be taken away by the water cooler.
c. Sometimes we, we directly determine the cooling capacity of the laser chiller based on the input power of the laser power minus the output power of the laser. For example, our commonly used RF lasers and solid-state lasers will indicate the rated full-power supply voltage and current. Taking a coherent 70W RF laser as an example, it requires a power input of 48V25A and an instantaneous 36A . It can calculate an input power of up to 1200W .
2. Water flow and booster pump head
Everyone will pay attention to the amount of cooling, and often ignore the indicator of water flow. The cooling capacity represents the cooling capacity provided by the compressor, and the water flow represents the ability of the chiller to remove heat. This causes the phenomenon that people often see: a chiller with a nominal cooling capacity of 1000W is connected to an 80W glass tube, chiller At 25 °C, the laser tube is hot and hot; in fact it does not play a role.
3. Thermal efficiency and water volume
The above concept leads to the concept of water-cooling machine thermal efficiency and water volume, which is the working control mode of the compressor and the size of the water tank. Generally, the larger the tank, the better, but the different compressor control methods in design will be very different. This is the same compressor cooling capacity and water volume. The operation control mode with PID feedback function will greatly improve the cooling capacity of the overall system.
4. Temperature control accuracy
This index is completely from the requirements of the laser. For semiconductor lasers, the temperature control accuracy must be ± 0.1 °C, which requires the compressor to predict the temperature change law, the adaptive load change, and generally the water cooler with integrated temperature control module is impossible to do. To this point. Of course, for CO2 lasers, the temperature requirement is ± 2 °C to ± 5 °C, and most of the dedicated water coolers on the market can do this.
5. Water quality requirements and water filtration and water circulation system materials
a. This comprehensive indicator is often ignored, but it is very reusable and directly affects the life of the laser.
i. For the CO2 glass tube laser, the lens at both ends belongs to the water flow dead angle, and it is easy to retain impurities in the water, resulting in poor heat dissipation. The micro-deformation of the lens directly affects the output beam quality and spot pattern of the laser.
Ii. For the RF laser, the accumulation of scale and copper rust on the heat sink will cause the temperature of the cavity to be too high, and the temperature sensor will alarm, and the laser will not emit light.
Iii. For YAG lasers, the surface cleanliness of the pump lamp, crystal and gold-plated cavity directly affects the optical power and spot pattern; the tiny water holes in the semiconductor module directly block the bar.
b. Most of the chiller refrigerant pipes on the market use copper pipes, and the evaporation plates are directly placed in the cooling water, which will generate a large amount of copper rust, which directly affects the laser.
c. Many filter-free ones are the direct addition of tap water to the chiller or the use of pure water that is not replaced for a long time. It will cause the growth of bacteria and impurities to deposit on the laser, affecting the life and use of the laser.
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