PROBLEM TO BE SOLVED: To selectively measure a concentration of an objective component in blood with high accuracy without performing troublesome operation.SOLUTION: Sets of a first wavelength and a second wavelength in each of which a peak appears in a change of a concentration change coefficient Qs with respect to each change of the first wavelength and the second wavelength obtained by obtaining the concentration change coefficient Qs of a target substance by respectively changing the first wavelength and the second wavelength by "Qs=[{Min(α1, α2)}/{Max(α1, α2)}]×(δαs2/α2-δαs1/α1)" where an absorption coefficient of water in the first wavelength is set as α1, an absorption coefficient of water in the second wavelength is set as α2, an absorption coefficient of the target substance in the first wavelength is set as αs1, and an absorption coefficient of the target substance in the second wavelength is set as αs2 are selected.COPYRIGHT: (C)2014,JPO&INPIT【課題】血液中の目的の成分の濃度を、煩雑な操作をすることなく、選択的かつ高精度に測定できるようにする。【解決手段】第1の波長における水の吸収係数をα1、第2の波長における水の吸収係数をα2、第1の波長における対象物質の吸収係数をαs1、第2の波長における対象物質の吸収係数をαs2とし、対象物質の濃度変化係数Qsを「Qs=[{Min(α1,α2)}/{Max(α1,α2)}]×(δαs2/α2-δαs1/α1)」により、第1の波長および第2の波長を各々変化させて求めることで得られる第1の波長および第2の波長の各々の変化に対する濃度変化係数Qsの変化の中で、ピークが出現する第1の波長および第2の波長の組を選択する。【選択図】 図1
