Method for inspecting a metal surface and associated device

A method for inspecting a metal surface of a part, the method comprising the following steps:

• procuring a first laser source arranged to generate a first laser beam having a first wavelength comprised between 1000 nm and 1100 nm and a power greater than 1 W;
• procuring a second laser source arranged to generate a second laser beam having a second wavelength comprised between 1500 nm and 1800 nm and a power greater than 1 W;
• procuring an optic comprising an entrance for a laser beam, and a device arranged to project the laser beam on the metal surface and to scan the metal surface with the laser beam;
• activating one of the first and second laser sources and transmitting the first or second laser beam to the entrance of the optic;
• scanning the metal surface with the first or second laser beam projected by the optic;
• and
• acquiring at least one image of an infrared radiation emitted by the metal surface.

A device for inspecting a metal surface of a part, the device comprising:

• a first laser source arranged to generate a first laser beam having a first wavelength comprised between 1000 and 1100 nm and a power greater than 1 W;
• a second laser source arranged to generate a second laser beam having a second wavelength comprised between 1500 and 1800 nm and a power greater than 1 W;
• an optic comprising an entrance for a laser beam and a device arranged to project the laser beam on the metal surface and to scan the metal surface with the laser beam;
• and
• a sensor capable of acquiring at least one image of the infrared radiation emitted by the metal surface,
• the first and second laser beams being configured, either one or the other, for transmission to the entrance of the optic.