Photo radiation intensity sensor and method thereof
First Claim
1. A photo radiation intensity directional sensor comprising a housing having a transparent or translucent portion, and a printed circuit board placed in such way in the housing that one of printed circuit board edges faces the transparent or translucent portion, at least a first and a second sensing element sensitive to radiation are placed at a first side of the printed circuit board, where the first and second sensing elements are separated by a first flange, serving as a shading element, at least a third sensing element sensitive to radiation is placed at a second side of the printed circuit board, where said sensing elements are arranged to detect both the direction and the intensity of the radiation source and for producing output signals which are used for estimating the sun radiation heating impact, and where the printed circuit board is arranged in such a way that it functions as a shading element between the areas on its first and second side where the sensing elements are mounted.
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Accused Products
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.
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Citations
22 Claims
- 1. A photo radiation intensity directional sensor comprising a housing having a transparent or translucent portion, and a printed circuit board placed in such way in the housing that one of printed circuit board edges faces the transparent or translucent portion, at least a first and a second sensing element sensitive to radiation are placed at a first side of the printed circuit board, where the first and second sensing elements are separated by a first flange, serving as a shading element, at least a third sensing element sensitive to radiation is placed at a second side of the printed circuit board, where said sensing elements are arranged to detect both the direction and the intensity of the radiation source and for producing output signals which are used for estimating the sun radiation heating impact, and where the printed circuit board is arranged in such a way that it functions as a shading element between the areas on its first and second side where the sensing elements are mounted.
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18. A photo radiation directional intensity sensor calibration method for a sensor having a housing with a transparent or translucent portion, a printed circuit board positioned in the housing, the printed circuit board having one edge facing the transparent or translucent portion, at least a first sensing element and a second sensing element sensitive to radiation being positioned at a first side of the printed circuit board, the first and second sensing elements being separated by a first flange, serving as a shading element, at least a third sensing element sensitive to radiation is placed at a second side of the printed circuit board, wherein said sensing elements are arranged to detect both the direction and the intensity of the radiation source and for producing output signals which are used for estimating the sun radiation heating impact, and wherein the printed circuit board is arranged in such a way that it functions as a shading element between the areas on its first and second side where the sensing elements are mounted, comprising:
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rotating the sensor 360°
in azimuth and from 0°
to 90°
in elevation under a fixed light source, which rotation takes place in predetermined steps;measuring all the azimuth steps for each elevation step, where each measurement results in a value from each sensing element that is part of the sensor; saving the acquired data amount in the form of tables and comparing with those of an ideal solar sensor; and calculating correction coefficients from this comparison. - View Dependent Claims (19)
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20. A photo radiation directional intensity sensor measuring method for a sensor having a housing with a transparent or translucent portion, a printed circuit board positioned in the housing, the printed circuit board having one edge facing the transparent or translucent portion, at least a first sensing element and a second sensing element sensitive to radiation being positioned at a first side of the printed circuit board, the first and second sensing elements being separated by a first flange, serving as a shading element, at least a third sensing element sensitive to radiation is placed at a second side of the printed circuit board, wherein said sensing elements are arranged to detect both the direction and the intensity of the radiation source and for producing output signals which are used for estimating the sun radiation heating impact, and wherein the printed circuit board is arranged in such a way that it functions as a shading element between the areas on its first and second side where the sensing elements are mounted, comprising:
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measuring the output values from each sensing element, and saving the measurement values to a digital memory; calculating an average value of the signal acquired from the sensing elements, which average value is proportional to the intensity of the detected radiation; calculating differences between output signals of opposite sensing elements; calculating normalized values p and q of the above differences by dividing them with the average value; calculating a first azimuth angle value Az=C1 arctan (p/q), where C1 is a constant; calculating a corrected azimuth angle value, using the calculated first azimuth value Az and using comparison with correction coefficients; calculating a first elevation angle value E=C2√
{square root over (p2+q2)} where C2 is a constant;calculating a corrected elevation angle value, using the calculated first elevation angle value E and using comparison with correction coefficients; calculating a first intensity value I=C3* the average value, where C3 is a constant; and calculating a corrected intensity value, using the calculated first intensity value E and using comparison with correction coefficients. - View Dependent Claims (21, 22)
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Specification