Uncertainty Analysis and Characterization of the SOFAST Mirror Facet
                    Characterization System

Finch, Nolan S.; Andraka, Charles E.

doi:10.1115/1.4024251

Cited by 8 publications

(2 citation statements)

References 3 publications

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“…Key elements missing in the work reported here are validation against ground truth and an analysis of measurement uncertainty and how it varies with configuration. We intend to address these problems in future work, extending the uncertainty analysis reported in [6].…”

Section: Data Availability Statementmentioning

confidence: 99%

Agile Deflectometry

Brost,

Smith,

Brimigion

2023

SolarPACES Conf Proc

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Concentrating Solar Power (CSP) systems use mirorrs to focus light onto a receiver, and high optical slope accuracy is required to achieve high concentration. Deflectometry is a technique for measuring optical slope directly, at fine spatial resolution across a miror surface. In this paper we report techniques for making an existing deflectometry system, SOFAST, more flexible and easier to deploy across a wide range of application scenarios. Example applications include mirror prototype development, high-volume manufacturing, outdoor in situ heliostat inspection, and education. We report using the resulting system to measure mirrors ranging in diameter from 0.13 m to 9.3 m, a range of nearly two orders of magnitude. Hardware implementations vary from a simple laptop computer to a system combining a computer, projector, screen, and camera. These efforts pursue a goal of making deflectometry easier to use, applicable to a wider range of problems, and widely available to the CSP community.

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Section: Data Availability Statementmentioning

confidence: 99%

Agile Deflectometry

Brost,

Smith,

Brimigion

2023

SolarPACES Conf Proc

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“…The milestone achievement was made by Andraka and co-authors in the Sadia National Laboratories, who developed the Sandia Optical Fringe Analysis Slope Tool (SOFAST) [14]. This fringe-reflection-based tool not only enables the fast characterization of mirror facets' shape and rotations in almost real-time [15], but also the development of the Alignment Implementation for Manufacturing using Fringe Analysis Slope Technique (AIMFAST) [16].…”

Section: Introductionmentioning

confidence: 99%

Precise Phase Measurement for Fringe Reflection Technique through Optimized Camera Response

Hu,

Zhu,

Huang

et al. 2023

Sensors

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The Fringe Reflection is a robust and non-contact technique for optical measurement and specular surface characterization. The periodic alternation between dark and light cycles of the fringe patterns encodes the geometric information and provides a non-contact method of spatial measurement through phase extraction. Precisely expressing the positions of the points of the fringe pattern is a fundamental requirement for an accurate fringe reflection measurement. However, the nonlinear processes, both in generating the fringe pattern on a screen and capturing it using pixel values, cause inevitable errors in the phase measurement and eventually reduce the system’s precision. Aiming at reducing these nonlinear errors, we focus on constructing a new quantity from the pixel values of the photos of the fringe patterns that could linearly respond to the ideal fringe pattern. To this end, we hypothesize that the process of displaying the fringe pattern on a screen using a control function is similar to the process of capturing the pattern and converting the illuminating information into pixel values, which can be described using the camera’s response function. This similarity allows us to build a scaled energy quantity that could have a better linear relation with the control function. We optimize the extracted camera response function using an objective to increase the precision and reduce the quoted error. Experiments designed to determine the positions of points along the quartile lines verify the effectiveness of the proposed method in improving fringe reflection measurement precision.

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A model-based approach for optical performance assessment and optimization of a solar dish

Xiao

Yang

et al. 2017

Renewable Energy

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Uncertainty Analysis and Characterization of the SOFAST Mirror Facet Characterization System

Cited by 8 publications

References 3 publications

Agile Deflectometry

Agile Deflectometry

Precise Phase Measurement for Fringe Reflection Technique through Optimized Camera Response

A model-based approach for optical performance assessment and optimization of a solar dish

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