Compact Raman sensor and apparatus for estimating bio-component

A Raman sensor comprising:

• a light source assembly having a plurality of light sources configured to emit light to a plurality of skin points of skin, each of the plurality of skin points having a predetermined separation distance from a light collection region of the skin from which Raman scattered light is collected;
• a light collector configured to collect the Raman scattered light from the light collection region of the skin;
• and
• a detector configured to detect the collected Raman scattered light,
• wherein the light source assembly comprises:
• a first reflection surface for reflecting the light, emitted by the plurality of light sources, in a predetermined direction;
• a second reflection surface for reflecting a first light beam, reflected by the first reflection surface, toward a first skin point having a first predetermined separation distance;
• and
• a third reflection surface for reflecting a second light beam, reflected by the first reflection surface, toward a second skin point having a second predetermined separation distance,
• wherein the second reflection surface and the third reflection surface are arranged in a concentric circle.