Patent ID: 7979994
Filing Date: 2011-07-19
Classification: G01J

Abstract:
1. An ultraviolet risk indicator, comprising: a rigid panel having a surface with a dial configuration based upon location, wherein said dial is bounded by solar hour lines and lines of declination (solstices or equinoxes) forming distinct zones of solar UV radiation risk which depend on the altitude of the Sun; said dial configuration was designed for the location based on a transformation of the hourly coordinates of the Sun (hour angle and declination) in a 3D Cartesian Coordinate System using a matrix calculation to produce necessary rotations of the system, taking into account the latitude of the location, declination, and inclination of the dial, wherein calculated solar hour lines and lines of declination define the dial and delimit a risk area of UV radiation between 08:00 and 10:00 hours of true solar time, and a projection device with either a polar style parallel to the rotational axis of the Earth, or a straight style perpendicular to the dial having a rod or triangular shape, said projection device being located at a point of convergence of hour lines if a polar style, or at the origin of coordinates if a straight style, and whose tip is the focus of projection of a point in space that is the Sun.