Blood glucose level measurement by confocal reflection photodetection system

In the present study, the confocal optical system has been constructed by using the near-infrared laser, and the reflection photodetection system of the living body has been developed. This system reduces the influence of a complex light scatter by the skin tissue and achieves a highly accurate measurement by confocal optical system. And the initial experiment for the development of the non-invasive blood glucose meter that presumed the blood glucose level by the near-infrared absorption of the living body has been done. In this report, the principle of the blood glucose level measurement of this system has been confirmed. The light intensity of the reflection in the living body skin tissue has been measured in the constructed system, and it has been compared with the blood glucose level reference value. As a result, the absorption of the reflected light that depended on the blood glucose level has been confirmed. The possibility of measuring the blood glucose level has been shown.