PROBLEM TO BE SOLVED: To provide a component concentration measurement device and method allowing for improvement of quantitative accuracy in measurement of a component concentration in an organism.SOLUTION: A component concentration measurement device 1 comprises: a light irradiation part modulating intensity of two lights having different wavelengths by signals having same frequencies and same phases, then irradiating a measurement target object 10 with the lights； a detection part detecting a photoacoustic wave which is generated in the measurement target object 10 by irradiation by the light irradiation part, then converting the photoacoustic wave into a first electric signal； and a processing part obtaining concentration of an object component 10G in the measurement target object 10 based on an amplitude and a phase of the first electric signal. Light absorption coefficients of two lights with respect to a background component 10W included in the measurement target object 10 have change amounts δ equal to each other with respect to change of temperature, and have codes different from each other.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2020,JPO&INPIT【課題】生体内成分濃度の測定における定量精度を向上させることができる成分濃度測定装置および方法を提供することを目的とする。【解決手段】 成分濃度測定装置１は、互いに異なる波長の２つの光を同一周波数で、かつ、同じ位相の信号によって強度変調して被測定物１０に照射する光照射部と、光照射部による照射によって被測定物１０の内部で発生する光音響波を検出して第１電気信号に変換する検出部と、第１電気信号の振幅および位相に基づいて、被測定物１０に含まれる対象成分１０Ｇの濃度を求める処理部とを備え、被測定物１０に含まれる背景成分１０Ｗに対する２つの光の光吸収係数は、温度の変化に対する変化量δが等しく、互いに符号が異なることを特徴とする。【選択図】 図１
