PURPOSE: To provide measurability for the absolute value of photo-absorptivity by performing auto zero processing of the photo-absorptivity including the auto gain setting to the standard of known photo-absorptivity in which the absorptivity is not zero, and using the absorptivity point-of-origin standard independent of patient.
CONSTITUTION: Auto zero processing of photo-absorptivity including auto gain setting is conducted to the standard of known photo-absorptivity where the absorptivity is not zero, and thereupon the initial photo-absorptivity value of a vital body specimen is measured. Then a similar auto zero processing is made again, and change in the photo-absorptivity thereafter is measured. In the standard 1 of known photo- absorptivity where the absorptivity is not zero, a light sending part 4a of a absorption side light guide 4 is installed at an opening of a light input part 2, and there the light is projected over. This projected light 6 diffuses at the inner surface of the light input part 2. The photo-receiving part 10a of a reception side light guide 10 is installed at the outlet opening of the light output part 8, and the diffused light 12 by the output part 8 is put incident to this light guide 10. A junction 14 is provided between these light input and output parts 2, 8, and setting is made so that an appropriate reduction of light intensity is obtained.
TAMURA TOMOMI
EDA HIDEO
