| abstract |
(57) [Summary]n[Purpose] To provide a reflective oxygen saturation measurement device with high measurement accuracy. provide.nA first light emitting element and a second light emitting element are provided. The distance from the light receiving element 16, that is, the radius r is 5 to 7 mm. Is detected by the light receiving element 16 The part of the scattered light that is deep from the body surface, Increased percentage of scattered light from sites with high blood vessel density Therefore, the AC component AC of the optical signal output from the optical sensor R Or AC IR And DC component DC R Or DC IR And the ratio (A C R / DC R ) Or (AC IR / DC IR ) Grows larger And the effect of noise is reduced, and the first optical signal SV R And the second optical signal SV IR The strength of oxygen saturation The stability and accuracy of the measurement of SaO2 are sufficiently obtained. |