PROBLEM TO BE SOLVED: To provide a component concentration measuring method in which the component concentration of an object substance in blood can be measured selectively with high accuracy without complicated operation.SOLUTION: A concentration-change coefficient Qs of an object substance is found by changing a first wavelength and a second wavelength, respectively, using Qs=[{Min(α1,α2)}/{Max(α1, α2)}]×(δαs2/α2-δαs1/α1), where a water absorption coefficient in a first wavelength is α1, the water absorption coefficient in a second wavelength is α2, an absorption coefficient of an object substance in the first wavelength is αs1, and the absorption coefficient of the object substance in the second wavelength is αs2. In the change of the concentration-change coefficient Qs to the change of each of the first wavelength and the second wavelength obtained by the above, a group of the first wavelength and the second wavelength is selected in which the dependence of each component itself is zero about each component of the object substance, and a ratio coefficient β=α1/α2 of the water absorption coefficient α of 2-wavelengths becomes 1.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2016,JPO&INPIT【課題】血液中の対象物質の成分の濃度を、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、対象物質の各成分について各成分自身の依存性がゼロであり、かつ2波長の水の吸収係数αの比率係数β=α1/α2が1になる第1の波長および第2の波長の組を選択する。【選択図】 図1
