Opto-electrical measuring apparatus for determining the relative hemoglobin content of an illuminated solution by evaluating its light absorption

TL;DR: An opto-electrical measuring apparatus for determining the hemoglobin content of an illuminated hemoglobin solution arranged in the path of light between a light source and a photoelectric transducer by evaluating the light absorption of the solution within a predetermined wavelength range is described in this article.

Abstract: An opto-electrical measuring apparatus for determining the hemoglobin content of an illuminated hemoglobin solution arranged in the path of light between a light source and a photoelectric transducer by evaluating the light absorption of the solution within a predetermined wavelength range. The spectral or spectrum properties of the light source, the transducer and other components arranged in the path of the light emanating from the light source are accommodated or matched to one another such that in the absence of the hemoglobin solution in the path of light an electrical magnitude generated in the photoelectric transducer possesses a spectral dependency which in the wavelength range of 540 to 560 nm constitutes a maximum value and to both sides of such range with a half-value width of at least 60 nm continually decreases to less than 20% of the maximum value at about 500 and 600 nm, respectively, and externally of these band limits asymptotically approaches the value null.