A measurement system for light-based measurement of collagen inside skin using a first light intensity and a second light intensity according to the present invention includes a light source that emits a light beam having a light source wavelength range, An optical system that deflects the light at a predetermined focal depth below the outer surface of the skin at the target location within the skin, thereby producing a deflected light beam. Guided and focused. The measurement system further includes a first detector for detecting a first light intensity within a first detection wavelength range and a second detection wavelength range of light reflected from the target position, respectively, and a second A second detector for detecting the light intensity； The measurement system further comprises a comparator coupled to the first detector and the second detector and 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 location, the light reflection spectrum of the polarized light beam reflected by the natural collagen has a plurality of adjacent first and second wavelength ranges, and in the first wavelength range, Constructive interference spreads between the deflected light beam and natural collagen, and destructive interference spreads between the deflected light beam and natural collagen in the second wavelength range. The first detection wavelength range is predetermined and / or controlled so as to be limited to one or more of the first wavelength range, and the second detection wavelength range is the second wavelength range. Are predetermined and / or controlled so as to be limited to one or more.本発明による、第1の光強度および第2の光強度を用いた、肌内部のコラーゲンの光ベース測定用の測定システムは、光源波長範囲を有する光ビームを放射する光源と、光源波長範囲内で光を偏向させる光学システムと、を有し、これにより、偏向された光ビームが生じ、偏向光ビームは、肌内のターゲット位置の肌の外表面の下側に、所定の焦点深さで誘導および焦点化される。測定システムは、さらに、それぞれ、ターゲット位置から反射される光の第1の検出波長範囲および第2の検出波長範囲内で、第1の光強度を検出する第1の検出器、および第2の光強度
