PROBLEM TO BE SOLVED: To reduce an affection of interference of a photoacoustic wave to a measurement accuracy of density of a constituent which is a measurement object included in an analyte.SOLUTION: A constituent density measurement device comprises: a light radiation part 2 for radiating light of one or more wavelengths to an analyte 10 an acoustic wave acquisition part 3 for detecting a photoacoustic wave generated in the analyte 10 by light radiation and a signal processing part 4 for deriving density of the constituent which is a measurement object included in the analyte 10 on the basis of at least one of intensity and frequency of the photoacoustic wave detected by the acoustic wave acquisition part 3. The acoustic wave acquisition part 3 selectively detects the photoacoustic wave radiated to a prescribed direction out of photoacoustic waves generated in the analyte 10 by the light radiation.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】被検体に含まれる測定対象の成分の濃度の測定精度に対する光音響波の干渉の影響を低減する。【解決手段】成分濃度測定装置は、1つ以上の波長の光を被検体10に照射する光照射部2と、光照射によって被検体10の内部で発生する光音響波を検出する音波取得部3と、音波取得部3で検出した光音響波の強度および周波数の少なくとも一方に基づいて、被検体10に含まれる測定対象の成分の濃度を導出する信号処理部4とを備える。音波取得部3は、光照射によって被検体10の内部で発生する光音響波のうち、所定の方向に放射される光音響波を選択的に検出する。【選択図】 図1
