SUBSTANCE-IN-BLOOD CONCENTRATION MEASUREMENT DEVICE AND SUBSTANCE-IN-BLOOD CONCENTRATION MEASUREMENT METHOD

摘要

A substance-in-blood concentration measurement device 1 for measuring the concentration of a substance contained in the blood of a living body Ob comprises: a target placement part 10 on which a measurement target part Mp of the living body Ob is placed, a light emitting part 20 for emitting a laser beam L1 to the measurement target part Mp, a photodetector 30 for receiving the reflected light of the emitted laser beam from the measurement target part Mp and detecting the intensity of reflected light L2, and an imaging lens 40 between the measurement target part Mp and the photodetector 30. In a segment from the target placement part 10 to the photodetector 30 in an optical path Op2 from the measurement target part Mp to the photodetector 30, the laser beam L2 propagates through a space except for a segment passing through the imaging lens 40, and the imaging lens 40 forms, on the photodetector 30, an image of the reflected light L2 reflected from the measurement target part Mp.