A New Reflected Target Optical Assessment System - Stage 1 Development Results: Preprint

Research output: Contribution to conferencePaper


NREL has completed stage 1 development of an indoor optical measurement tool for fully assembled heliostats and single facets. This tool began as an indoor version of NREL's NIO technique. It uses similar techniques to other available tools (deflectometry, photogrammetry, etc.), but is designed require very little infrastructure, labor, and time to set up and collect surface slope and canting measurements on fully assembled heliostats and parabolic trough facets, making it a valuable tool for quality assurance and laboratory measurement of helio-stat optics. It accomplishes this by using computer vision, photogrammetry, and multiple images stitched together to minimize the printed target size and required setup precision. This adaptable setup is useful for taking measurements at a variety of heliostat pointing angles, and for measuring fully assembled heliostats on the assembly line. The measurement system's methodology and an analysis of its uncertainty, sensitivity and comparison with established optical measurement systems is described below.
Original languageAmerican English
Number of pages13
StatePublished - 2023
EventSolarPACES Conference - Albuquerque, New Mexico
Duration: 27 Sep 202230 Sep 2022


ConferenceSolarPACES Conference
CityAlbuquerque, New Mexico

NREL Publication Number

  • NREL/CP-5700-84142


  • canting
  • computer vision
  • concentrating solar power
  • deflectometry
  • heliostat optics
  • measurement
  • photogrammetry
  • slope


Dive into the research topics of 'A New Reflected Target Optical Assessment System - Stage 1 Development Results: Preprint'. Together they form a unique fingerprint.

Cite this