Patent ID: 8482742

Claim:
A measuring apparatus comprising: a filter that transmits light of a predetermined wavelength; a first light receiving unit which receives a first light that is output from a first light source, reflected by or transmitted through an object to be measured, and transmitted through the filter and a second light that is output from a second light source, reflected by or transmitted through the object to be measured, and transmitted through the filter, and through which a first signal in response to the received first and second lights travels; a second light receiving unit which receives light of a different path from the light received by the first light receiving unit, and through which a second signal in response to the received light travels; a difference extracting unit that obtains a difference signal between the first signal traveling through the first light receiving unit and the second signal traveling through the second light receiving unit; and an information generating unit that generates information of the object to be measured based on the signal obtained from the difference extracting unit.