In the context of measuring emissivity and absorptivity for material anodization used in space applications, the wavelength range typically considered is the infrared (IR) region. In particular, the long-wave infrared (LWIR) or mid-wave infrared (MWIR) regions are commonly used.
The specific wavelength range within the IR region depends on the application and the properties of the material being analyzed. Generally, wavelengths between 2.5 to 25 micrometers (µm) are often utilized for emissivity and absorptivity measurements in the IR range.
It's important to note that different materials may have varying spectral responses and absorption characteristics, which is why the exact wavelength range used for measurements can vary depending on the specific application and material properties.