1. Fundamental laws of infrared radiation

1.1 Spectral range

Infrared radiation is part of the electromagnetic spectrum. The description of these phenomena has two inseparable and complementary aspects.

1.1.1 Wave aspect

Electromagnetic radiation can be broken down into a spectrum made up of simple periodic radiations, monochromatic radiations, interpreted as the oscillations of electromagnetic fields and characterized in particular by their frequency f. These waves propagate without attenuation in a vacuum with a celerity c...