The present invention is a device suitable for characterizing photovoltaic concentration modules which allows obtaining the angular transmission function both of the module and of each group formed by cell and optical element, as well as for assessing the optical quality of the module.
1. Method for characterizing a photovoltaic concentration module (1) which in turn comprises a plurality of elementary "solar cell-optical element" units, applicable to a device comprising: a) an optical collimator (2) defining the focal plane (P) oriented perpendicular to the focal axis (C) of the optical collimator (2) and positioned passing through the focal point (F) of said optical collimator (2), b) a support (6) suitable for supporting the module (1) to be characterized located in a location of the focal plane (P) and with the main receiving surface of the module (1) oriented towards the optical collimator (2), c) a power supply source (4) suitable for electrically powering the module (1) such that said module (1) operates as a light emitter, d) a plurality ofn cameras (3) which in turn comprise an image sensor (3.1) and an optical element (3.2) where: - the plurality ofn cameras (3) is distributed along a line (L1, L2) located essentially in the focal plane (P) where each of the cameras (3) is oriented for taking an image of the module (1) through the optical collimator (2), - the line (L1, L2) along which the plurality ofn cameras (3) is distributed is contained in a planePα perpendicular to the focal plane (P) having an orientation coinciding with the orientation determined by the axis of the primary plane of the module (1) along which the angle α, coinciding with the independent variable of the impulse functionh (α) with which the module (1) is to be characterized, is examined, - the position of each camera (3) is such that it captures the image of the module (1) located in the support (6) corresponding to the light emission with a specific direction according to the angle of incidence α transmitted through the optical collimator (2), - the focus of the optical element (3.2) of each of the cameras (3) is such that the image obtainable from the module (1) through the optical collimator (2) is located within the depth of field, e) a central processing unit (5) in communication with the image sensors (3.1) of each of the cameras (3) suitable for receiving the images (Ii , i = 1..n ) captured by the image sensors (3.1) and for carrying out the processing of said images; where said method comprises the following steps: f) placing the module (1) to be characterized on the support (6) oriented towards the optical collimator (2), g) electrically powering the module (1) so that it operates as an emitter emitting light towards the optical collimator (2), h) while the module (1) is emitting light, capturing the image (I) of the module by means of the image sensors (3.1) of each of the cameras (3) of the plurality ofn cameras (3) and transferring said images (Ii , i = 1..n ) to the central processing unit (5), i) by means of the central processing unit (5), for an pre-established elementary "solar cell-optical element" unit from among the plurality ofn elementary units comprised in the module (1): - identifying in each image (Ii , i = 1..n ) the area corresponding to the pre-established elementary "solar cell-optical element" unit, - determining, for each image (Ii , i = 1..n ), the angle of incidence α of the light beam emission reaching the camera (3) which has captured said image, - evaluating, for each image (Ii , i = 1..n ), the emission radiation intensity of the "solar cell-optical element" group from the portion of image located inside the area of the image corresponding to said pre-established elementary "solar cell-optical element" unit, j) from the correspondence between each of the angles of incidence α of the emission and the radiation intensity values evaluated in the image associated with said angle of incidence α of the emission, generating a discrete functionhi =h (αi );i = 1..n for the pre-established elementary unit, k) providing the functionh (αi );i = 1..n as the impulse response function for a temporary source which characterizes the pre-established elementary "solar cell-optical element" unit. 2. The method according to claim 1,characterized in that by means of the images captured in step h), steps i) and j) are carried out for a plurality of elementary "solar cell-optical element" units or for all the elementary "solar cell-optical element" units, characterizing from the same images said plurality of or all the "solar cell-optical element" groups. 3. The method according to claim 1 or 2,characterized in that the device comprises a multiplicitym of rows formed by a plurality ofn cameras (3) distributed along each row giving rise to an array of cameras (3), this array of cameras (3) being located essentially in the focal plane (P). 4. The method according to claim 4,characterized in that by means of images from cameras distributed in rows in the array and by means of images from cameras distributed in columns in the same array, steps i) and j) are carried out for one or more elementary "solar cell-optical element" units for simultaneouslycharacterizing by means of impulse response functions corresponding to directions of incidence contained in the planes determined by the positions of the cameras. 5. The method according to any of claims 1 to 4,characterized in that the support (6) suitable for supporting the module (1) is inclined with respect to the focal axis (C) of the optical collimator (2) and the plurality ofn cameras (3) is spaced from the same focal axis (C). 6. The method according to any of claims 1 to 4,characterized in that the support (6) suitable for supporting the module (1) is parallel to the focal plane (P) and perpendicular with respect to the focal axis (C) of the optical collimator (2); and the plurality ofn cameras (3) is centered with respect to the focal axis (C). 7. The method according to any of the preceding claims,characterized in that at least one of the cameras (3) has the focus established with a focal length located in the infinite. 8. The method according to any of the preceding claims,characterized in that the central processing unit (5) is in turn comprised by central processing subunits responsible for specific tasks. 9. The method according to any of the preceding claims,characterized in that the radiation intensity associated with an area of the image is determined by assigning a specific scalar value to each pixel of the area and from these values the radiation intensity is calculated as the sum of all the assigned values. 10. The method according to claim 9,characterized in that the radiation intensity value associated with an area of the image taken as a sample of a curve is normalized by the sum of all the values forming said curve. 11. The method according to any of the preceding claims,characterized in that , given a radiation source defined from its characteristic functions (α), the angular transmission functionf (α) characterizing the behavior of an elementary "solar cell-optical element" unit with respect to said source is determined as the convolution of the characteristic functions (α) with the impulse response function f α = f * h α obtained for said elementary unit. 12. A device suitable for characterizing a photovoltaic concentration module (1) comprising components a)-e) of claim 1 and where the central processing unit (5) is suitable for carrying out tasks f)-j) of said claim 1. 13. The device according to claim 11,characterized in that it comprises an array of cameras (3). 14. The device according to claim 11,characterized in that the optical collimator is a collimator mirror (2).