Patent ID: 9008742
Filing Date: 2015-04-14
Classification: A61B,G01N

Abstract:
1. A constituent concentration measuring apparatus comprising: light generating means for generating light; light modulation means for electrically intensity-modulating the light at a constant frequency; light outgoing means for outputting the intensity modulated light toward a test subject; an acoustic wave generator that outputs an acoustic wave; acoustic wave detection means for detecting a photoacoustic signal emitted from the test subject, which is irradiated with the intensity modulated light, as an actual signal, and for detecting an intensity of the acoustic wave output by the acoustic wave generator and transmitted through the test subject as a reference signal; drive means for varying a position of at least one of the acoustic wave generator, the light outgoing means, and the acoustic wave detection means; and control means for controlling the drive means to detect plural reference signals from a plurality of positions, analyzing the plurality of reference signals to determine an optimum propagation path having minimized reflection/scattering characteristics, and detecting the actual photoacoustic signal from the position corresponding with the optimum propagation path.