Biological information measuring apparatus,reference element, and method of using the biological information measuring apparatus

摘要

When there is any abnormality or characteristic change in the light intensity of a light source or the sensitivity of a light detector, measurement accuracy decreases. To address this problem an apparatus is provided including a light source, a living body measuring optical element for applying light emitted from the light source to a living body and receiving light returning from the living body, and a light detector for detecting the light received by the living body measuring optical element. The apparatus also includes a light guide which can be arranged in contact with the living body measuring optical element, in which an abnormality is detected or corrected by use of output from the light detector in a state where the light guide is arranged in contact with the living body measuring optical element.