title: Two-dimensional angular transmission characterization of CPV modules.
abstract: This paper proposes a fast method to characterize the two-dimensional angular transmission function of a concentrator photovoltaic (CPV) system. The so-called inverse method, which has been used in the past for the characterization of small optical components, has been adapted to large-area CPV modules. In the inverse method, the receiver cell is forward biased to produce a Lambertian light emission, which reveals the reverse optical path of the optics. Using a large-area collimator mirror, the light beam exiting the optics is projected on a Lambertian screen to create a spatially resolved image of the angular transmission function. An image is then obtained using a CCD camera. To validate this method, the angular transmission functions of a real CPV module have been measured by both direct illumination (flash CPV simulator and sunlight) and the inverse method, and the comparison shows good agreement.
authors.affiliation: Instituto de Energía Solar, E.T.S Ingenieros de Telecomunicación, Universidad Politécnica de Madrid, Ciudad Universitaria 28040, Madrid, Spain. rebeca.herrero@ies-def.upm.es
authors.forename: R
authors.initials: R
authors.lastname: Herrero
authors.forename: C
authors.initials: C
authors.lastname: Domínguez
authors.forename: S
authors.initials: S
authors.lastname: Askins
authors.forename: I
authors.initials: I
authors.lastname: Antón
authors.forename: G
authors.initials: G
authors.lastname: Sala