Calibration method and calibration device for a group of reflectors for concentrating solar radiation onto a radiation receiver

US11073307B2 · kind B2 · utility

Assignee

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Gregor Bern · Glückstadt, DE
• Peter Schoettl · Glückstadt, DE
• De Wet Van Rooyen · Glückstadt, DE
• Peter Nitz · Gundelfingen, DE
• Anna Heimsath · Freiburg (Elbe), DE

Key dates

• Filing date: Sep 26, 2017
• Grant date: Jul 27, 2021
• Expiry date: Apr 13, 2038

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E10/47
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a calibration method for a group of reflectors for concentrating solar radiation onto a radiation receiver, having the following steps: A) aligning the reflectors in order to at least partly expose a calibration surface to solar radiation reflected by the reflectors; B) modifying the intensity distribution of the radiation incident on the calibration surface by carrying out a pattern of movements by each reflector of the group, wherein at least one specified parameter for the pattern of movements of each reflector differs from the parameters of the other reflectors, said parameter being selected from the group: —movement frequency,—movement amplitude,—movement phase angle, and—trajectory of the solar radiation, reflected by the reflector, within the calibration surface; C) recording rows of pixels for a plurality of differently located location points of the calibration surface by at least one camera, each row of pixel having at least five temporally offset pixel recordings; D) ascertaining a spectrum for each row of pixels by transforming the row of pixels into the frequency domain; E) assigning a subset of spectra to the reflectors on the basis of the mov…