Apparatus and method for non-invasively measuring bio-fluid concentrations by using photoacoustic spectroscopy

摘要

An apparatus and a method for non-invasively measuring bio-fluid concentrations by using photoacoustic spectroscopy are provided. The apparatus includes a light source which irradiates on a predetermined part of a living body an optical signal having a predetermined wavelength band which can be absorbed into a predetermined component of a living body, an acoustic signal generator which generates in the vicinity of the predetermined part of the living body an acoustic signal A1 having a similar frequency band to the frequency band of a photoacoustic signal PA that is generated when the optical signal is absorbed into the predetermined component of the living body, a signal detector which detects the photoacoustic signal PA and an acoustic signal A2 that is a modulated signal of the acoustic signal A1 due to the acoustic characteristics of the living body, a controller which generates the acoustic signal A1 in a predetermined frequency band, an optical detector which detects an intensity E of the optical signal, and a calculator which calculates a signal compensation value (N) based on an intensity (E) of the optical signal from the light source, and the photoacoustic signal (PA) and the acoustic signal A2 input from the signal detector, and computes a concentration (C) of the predetermined component. <IMAGE>