Patent ID: 8116851

Claim:
A measurement apparatus for measuring a particular body composition of a living body that determines skin color and skin thickness to output a measurement of the particular body composition, said apparatus comprising: a first light source being arrangeable in use when substantially in contact with a first position of a skin surface of a living body and being configured to radiate a first light having a visible light wavelength range onto the skin surface; a second light source being arrangeable in use when substantially in contact with a second position of the skin surface and being configured to radiate a second light in a near-infrared wavelength range onto the skin surface; an optical detector being arrangeable in use when substantially in contact with the skin surface at a predetermined distance from the first and second light sources and being configured to detect the first and second lights being output from the skin and convert the detected first and second lights into electric signals; and a controller configured for sequentially driving the first and second light sources and for determining skin color and skin thickness to output the particular composition of the living body based on a comparison of intensity values of lights detected and output by the optical detector with predetermined values in storage for a particular determined skin color and skin thickness; a waveguide being arrangeable in use when substantially in contact with the skin, between the optical detector and the first and second light sources, the waveguide being configured to allow the first or second light inputted from one of the first and second light sources to travel around the optical detector with total reflection; and at least one light extracting pattern being configured to extract the first or second light traveling with total internal reflection from the waveguide by scattering or reflecting the first or second light and being configured to radiate the first or second light onto the surface of the skin.