The scattering coefficient is precisely measured in an absorption scattering complex.From in vitro to in vivoA first irradiation portion for irradiating light at a first wavelength with a first irradiation intensity andA second irradiation portion for irradiating a light of a second wavelength with a second irradiation intensity from an in vitro to a living body andAt the first detection position, a first distance from the light irradiation position by the first irradiation sectionA first light intensity detecting portion for detecting a first light receiving intensity of light at a first wavelength emitted from a living bodyAt the second detection position, the second distance from the light irradiation position by the second irradiation sectionA second light intensity detecting portion for detecting a second light receiving intensity of light at a second wavelength emitted from the organismThe absorption coefficient is calculated based on the second light receiving intensity.The scattering coefficient of light in vivo is calculated based on the first light receiving intensity and absorption coefficient.The control unit has a control unit for calculating the scatterer concentration in vivo based on the scattering coefficient of the calculated light.Diagram【課題】 吸収散乱複合体において、散乱係数を精度よく計測する。【解決手段】 生体外から生体内に向けて、第１の照射強度で第１の波長の光を照射する第１の照射部と、生体外から生体内に向けて第２の照射強度で第２の波長の光を照射する第２の照射部と、第１の照射部による光の照射位置から第１の距離をあけた第１の検出位置における、生体から放出された第１の波長の光の第１の受光強度を検出する第１の光強度検出部と、第２の照射部による光の照射位置から第２の距離をあけた第２の検出位置における、生体から放出された第２の波長の光の第２の受光強度を検出する第２の光強度検出部と、第２の受光強度に基づき吸収係数を算出し、第１の受光強度と吸収係数に基づき生体内における光の散乱係数を算出し、算出された光の散乱係数に基づき生体内における散乱体濃度を算出する制御部とを有する。【選択図】 図１
