Process and device for determination of a portion of a component of the air exhaled by a breathing living being characteristic of the metabolic function of such living being

摘要

The invention relates to a process for determination of a first component A_a,1 in the air exhaled by a breathing living being characteristic of the metabolic function of such breathing living being, in particular the portion of carbon dioxide (CO₂) or oxygen (O₂), the exhaled air having at least two components (i1, 2, . . . ) each having a portion A_a,i, and the molecular weights M_i and the adiabatic coefficients k_i of the components being known, characterized in that the velocity of sound v_s in the exhaled air is measured, and in that the portion A_a,1 of the first component in the exhaled air is calculated by use of the measured velocity of sound v_s, the temperature T of the exhaled air, and the relation M_G/k_GRT/(V_s²), the statement M_Gsum(A_a,iM_i), i1, 2, . . . , applying to the molecular weight M_G of the exhaled air, and the statement 1/(1k_G)sum(A_a,i/(1k_i)), i1, 2, . . . , applying to the adiabatic coefficient k_G, and R being the universal gas constant; the invention also relates to a device for application of this process.