PROBLEM TO BE SOLVED: To provide a light absorption coefficient calculation device for reducing an effect of noise generated by a layer other than a target layer, a concentration determination device, a light absorption coefficient calculation method, a concentration determination method, a program for calculating a light absorption coefficient, and a program for calculating a concentration.SOLUTION: The light absorption coefficient calculation device includes: irradiation means 102 light receiving means 103 optical intensity acquisition means 104 and light absorption coefficient calculation means 106 for obtaining a calibration curve created based optical intensity at a predetermined time of a time resolution waveform of short-time pulse light in a plurality of observation target models, optical intensity at non-absorption time at the predetermined time of the time resolution waveform of the short-time pulse light in the plurality of observation target models, and a model value of the light absorption coefficient of each of a plurality of layers of light scattering media set in each of the plurality of observation target models, and collating the optical intensity obtained by the optical intensity acquisition means 104 with the calibration curve to calculate a light absorption coefficient on an arbitrary layer.COPYRIGHT: (C)2014,JPO&INPIT【課題】目的の層以外の層によるノイズの影響を軽減する光吸収係数算出装置、濃度定量装置、光吸収係数算出方法、濃度定量方法、光吸収係数の算出を行うプログラム及び濃度の算出を行うプログラムを提供する。【解決手段】照射手段102と、受光手段103と、光強度取得手段104と、複数の観測対象のモデルにおける短時間パルス光の時間分解波形の所定の時刻における光強度と、複数の観測対象のモデルにおける短時間パルス光の時間分解波形の所定の時刻における無吸収時の光強度と、複数の観測対象のモデルの各々について設定された複数の光散乱媒質の層の各々の層の光吸収係数のモデル値と、に基づいて作成された検量線を取得し、光強度取得手段104が取得した光強度を検量線と照合して、任意の層における光吸収係数を算出する光吸収係数算出手段106と、を含む。【選択図】図1
