Patent ID: 9662067
Date: 2017-05-30
CPC Classifications: A61B,A61N,G01J,H05B,Y02B

Claim:
1. A light exposure sensing system for sensing light exposure of a user, comprising: at least one wearable device; at least two light receivers oriented towards different directions orthogonal to each other and configured to receive light from the different directions, the light receivers being arranged on the at least one wearable device, and a control unit configured to determine light intensities received from the at least two light receivers, wherein the control unit is further configured to determine a ratio of daylight to artificial light (X/Y) based on the light intensities received from the at least two light receivers and based on the relation wherein a highest light intensity of the light intensities received from the at least two light receivers is denoted as S 1 , a lowest light intensity of the light intensities received from the at least two light receivers is denoted as S 2 , and f is an illuminance ratio of vertical to horizontal illuminance from the artificial light.