The present invention relates to a light-based collagen measurement measuring system using a first light intensity and a second light intensity comprising a light source (120) to emit a light beam. which has a source wavelength range and an optical system (130) for polarizing light within the source wavelength range thereby generating a polarized light beam (140) to direct and focus the light beam. polarized light (140) at a target position within the skin (160) at a predetermined depth of focus below an outer skin surface. the measurement system further comprises a first detector (150) and a second detector (250) for detecting the first light intensity and the second light intensity within, respectively, a first detection wavelength range and a second range wavelength of light detection (145) reflected from the target position. The metering system further comprises a comparator coupled to the first detector (150) and the second detector (250) configured and arranged to determine a difference between the first light intensity and the second light intensity. when natural collagen is present at the target position, a reflected light spectrum of the polarized light beam (140) reflected by said natural collagen comprises a plurality of adjacent first and second wavelength bands, wherein in said first wavelength bands wavelength, constructive interference prevails between the polarized light beam and natural collagen, and that in said second wavelength ranges, destructive interference prevails between the polarized light beam and natural collagen. the first sensing wavelength range is predetermined and / or controlled to be confined to one or more of said wavelength ranges, and the second sensing wavelength range is predetermined and / or controlled to be confined in one or more of said second wavelength ranges.a presente invenção refere-se a um sistema de medição para medição de colágeno baseada em luz, com o uso de uma primeira intensidade de luz e uma segunda intensid
