Compact optical probe and related measuring method

The invention concerns a compact optical probe and a measuring method associated with said probe. The probe (1) comprises means emitting (20) an incident light beam on a sample, a light diffusion detector capable of detecting the light diffused by the sample and a wall semitransparent (51) to the incident beam arranged so as to separate the sample from the emitting means and the light diffusion means. The probe also comprises a light reflection detector (40), capable of detecting a beam directly reflected by the semitransparent wall illuminated by the same incident beam. The reflected beam serves as reference for the diffused beam.