Diffuse reflection of infrared light around 850nm

[idz]

Hello, i have a very basic question about reflection of infrared light.

What types of materials will give a diffuse reflection of light in the near IR spectrum (around 850nm)?
Is the original wavelength affected by this reflection?

thx in advance,
michael .

 

[Andy Resnick]

InfraGold is the 'gold standard' (no pun intended). Many types of textured surfaces will produce diffuse scatter in the waveband you are interested in- textured paints, for example.

As long as the scattering is elastic, the scattered wavelength will be the same as the incident wavelength. Simply find out if the material absorbs at your waveband of interest.