Detecting Metal Impurities

The detection of slag impurities in molten metals is critical for ensuring high-quality metal production and improving manufacturing yield. InGaAs short wave infrared (SWIR) cameras offer a powerful imaging solution for this task by capturing thermal emissions and reflected light in the 900 nm to 1700 nm range. One of their key advantages lies in their ability to distinguish between slag and molten metal based on emissivity differences at high temperatures—typically between 980°C and 1650°C.

Slag forms as a byproduct during metal processing and, if not properly separated, can contaminate the final product. By using InGaAs cameras for real-time slag detection, operators gain valuable insight into the optimal time to stop the pour, ensuring only pure molten metal is transferred from the ladle. This precision minimizes waste, boosts production efficiency, and helps maintain consistent product quality. Missing the correct process endpoint not only compromises the integrity of the metal but also increases production costs due to the need for rework or material scrapping.

In addition to their imaging capabilities, InGaAs cameras offer practical advantages in industrial settings. They can be used with standard glass windows instead of expensive sapphire or germanium alternatives, allowing the cameras to be housed safely in protective enclosures without sacrificing performance. This makes them a cost-effective and robust solution for continuous use in harsh, debris-prone environments. Overall, InGaAs SWIR cameras represent a significant advancement in molten metal monitoring, helping manufacturers optimize process control and material integrity.