Patent ID: 8332006
Filing Date: 2012-12-11
Classification: A61B,G01N

Abstract:
1. A constituent concentration measuring apparatus characterized by comprising: light generating means for generating two light beams having different wavelengths; light modulation means for electrically intensity-modulating each of the two light beams having the mutually different wavelengths using signals having the same frequency and reverse phases; light outgoing means for outputting the two intensity-modulated light beams having the mutually different wavelengths toward a test subject; acoustic wave detection means for detecting an acoustic wave emitted in said test subject by the outputted light; and constituent concentration computation means for computing a constituent concentration of a constituent from pressure of the detected acoustic wave, the constituent being set as a measuring object in said test subject, wherein said constituent concentration computation means divides pressure of the acoustic wave, which is emitted by irradiating said two light beams having the mutually different wavelengths to said test subject, by pressure of the acoustic wave which is emitted when one of said two light beams is set to zero power.