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Laser Hardening

This process uses a laser to harden the surface of the metal while retaining the flexibility of the metal underneath. Accurate temperature monitoring helps ensure the surface is heated to the correct level to achieve the desired strength, while leaving the internal properties of the metal unaffected.

To achieve high-precision temperature monitoring, it is important to measure the surface of the metal and not the laser. Contact methods cannot be used, as they are themselves heated by the laser. Since the laser uses wavelengths shorter than 1.2µm, non-contact infrared measurements at 1.6µm or 2.4µm are ideal.

Infrared measurements at 1.6µm or 2.4µm will ignore the laser to directly measure the surface area of the metal, providing a true temperature reading. This can be used to ensure the correct quality of hardening is achieved. 

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