Heliostat Error Detection

Guangdong Zhu (Inventor), Rebecca Mitchell (Inventor)

Research output: Patent


The present disclosure describes non-intrusive optical (NIO) characterization methods which efficiency measures optical errors (such as mirror surface slope error, mirror canting error, and heliostat tracking error) of a heliostat field. The methods utilize photogrammetry and deflectometry to analyze an image taken of a heliostat to determine optical errors and increase the amount of solar energy delivered by the heliostat to the receiver.
Original languageAmerican English
Patent number11,250,587 B2
Filing date15/02/22
StatePublished - 2022

NREL Publication Number

  • NREL/PT-5700-82165


  • collinearity equations
  • deflectometry
  • optical efficiency
  • photogrammetry
  • plurality of pixels


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