Abstract: The present invention relates to a photo radiation intensity sensor (1) comprising a housing (2) having a lens (4), and a printed circuit board (7) placed in such way in the housing (2) that one of its edges (37) faces the lens (4), where at least a first and a second sensing element (5a, 5b) are placed at a first side (7?) of the printed circuit board (7), where the first and second sensing elements (5a, 5b) are separated by a first flange (8), serving as a shading element. Further, at least a third sensing element (5?; 5c) is placed at a second side (7?) of the printed circuit board (7), arranged to detect both the direction and the intensity of the radiation source and for producing corresponding output signals. The present invention also relates to a calibration and measurement method.

Abstract: A radiation intensity directional sensor includes a housing having an opening covered by a transparent or translucent lens element, an array of sensor elements sensitive to radiation, preferably to electromagnetic radiation in the visible and/or infrared range, and a shading element separating at least two of the sensor elements. The shading element at least partly blocks light from impinging directly on one of two sensing elements separated by the shading element. The array of sensor elements is thereby arranged for producing output signals from the at least two separated sensor elements having different amplitudes whereby the difference in amplitude is used for estimating the position of a light source in relation to the sensor housing.