PROBLEM TO BE SOLVED: To provide a component concentration analyzer and analyzing method removing dispersion of a plurality of components included in a sample or disturbance of environmental factors such as a temperature, and identifying highly accurately a component concentration which is a measuring object.SOLUTION: This component concentration analyzer is equipped with: a photoacoustic signal detection means for generating mixed light formed by performing intensity modulation of two wavelength-variable lights with a signal having the same frequency in a reverse phase and by mixing the lights, detecting a sound wave generated from a sample by irradiating the sample with the mixed light, and acquiring spectrum data of each of the two lights from the sound wave and an operation means for calculating a difference of the spectrum data of each of the two lights acquired by the photoacoustic signal detection means, and measuring a concentration of the measuring object component included in the sample.COPYRIGHT: (C)2011,JPO&INPIT【課題】試料に含まれる複数成分のばらつきや温度等の環境因子の擾乱を除外でき、測定対象の成分濃度を高精度に同定することを可能にする成分濃度分析装置及び成分濃度分析方法を提供することを目的とする。【解決手段】本成分濃度分析装置は、波長可変な2つの光を逆位相の同一周波数の信号でそれぞれ強度変調して混合した混合光を生成し、前記混合光を試料に照射して前記試料から発生する音波を検出し、前記音波から前記2つの光毎のスペクトルデータを取得する光音響信号検出手段と、光音響信号検出手段が取得した前記2つの光毎のスペクトルデータの差分を計算し、前記試料に含まれる測定対象成分の濃度を測定する演算手段と、を備える。【選択図】図5
