Patent ID: 6921366

Claim:
An apparatus for non-invasively measuring bio-fluid concentrations comprising: a light source for irradiating an incident light having a predetermined wavelength band which can be absorbed into a targeted component of a living body on a predetermined part of a living body; an acoustic signal generator for generating a first acoustic signal A 1 having a similar frequency band to the frequency band of a photoacoustic signal PA that is generated when the incident light is absorbed into the targeted component of the living body in the vicinity of the predetermined part of the living body; a ultrasonic translator for detecting the photoacoustic signal PA and a second acoustic signal A 2 that is a modulated signal of the first acoustic signal A 1 due to the acoustic characteristics of the living body; a controller for generating the first acoustic signal A 1 in a predetermined frequency band; a light detector for detecting an intensity E of the incident light; and a calculator capable of calculating a signal compensation value N based on the intensity E of the incident light from the light source, the photoacoustic signal PA input from the ultrasonic translator, and a coefficient of sound wave transmission A C , and capable of computing a concentration C of the targeted component.