Grating-Embedded Mirrors for Heliostat tracking error metrology

Hayden J. Wisniewski; Ian J. Arnold; Daewook Kim; Heng Zuo; Brandon D. Chalifoux

doi:10.1117/12.2677723

Grating-Embedded Mirrors for Heliostat tracking error metrology

Hayden J. Wisniewski, Ian J. Arnold, Daewook Kim, Heng Zuo, Brandon D. Chalifoux

Optical Sciences

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

Concentrated solar power (CSP) plants need to monitor the surface slope error of thousands of heliostats with sub-milliradian accuracy. We present grating embedded mirrors (GEMs) and the accompanying Diffractive Auto-Stigmatic Hartmann Camera (DASHCam) metrology system for measuring heliostat surface slopes. GEMs have multiple phase diffraction gratings written within a glass mirror substrate using an ultrafast laser. The gratings direct a small fraction of incident light to non-specular directions, which the DASHCam senses from a virtual center of curvature to measure the facet slopes at each grating location. Our results show, in a laboratory environment, 24 µrad RMS measurement repeatability and 47 µrad RMS accuracy, with single-shot image capture. GEMs and DASHCam are a compact, accurate, and high-speed heliostat slope error metrology system that is robust to the harsh environmental conditions at CSP plants.

Original language	English (US)
Title of host publication	Advances in Solar Energy
Subtitle of host publication	Heliostat Systems Design, Implementation, and Operation
Editors	Guangdong Zhu, Marc Roger, Zhifeng Wang
Publisher	SPIE
ISBN (Electronic)	9781510665569
DOIs	https://doi.org/10.1117/12.2677723
State	Published - 2023
Event	Advances in Solar Energy: Heliostat Systems Design, Implementation, and Operation 2023 - San Diego, United States Duration: Aug 20 2023 → Aug 22 2023

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	12671

Conference

Conference	Advances in Solar Energy: Heliostat Systems Design, Implementation, and Operation 2023
Country/Territory	United States
City	San Diego
Period	8/20/23 → 8/22/23

Keywords

Grating-embedded mirrors
Heliostat
Heliostat metrology
Heliostat tracking error
Ultrafast laser applications
Ultrafast laser grating writing

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

Access to Document

10.1117/12.2677723

Cite this

Wisniewski, H. J., Arnold, I. J., Kim, D., Zuo, H., & Chalifoux, B. D. (2023). Grating-Embedded Mirrors for Heliostat tracking error metrology. In G. Zhu, M. Roger, & Z. Wang (Eds.), Advances in Solar Energy: Heliostat Systems Design, Implementation, and Operation Article 1267104 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 12671). SPIE. https://doi.org/10.1117/12.2677723

Grating-Embedded Mirrors for Heliostat tracking error metrology. / Wisniewski, Hayden J.; Arnold, Ian J.; Kim, Daewook et al.
Advances in Solar Energy: Heliostat Systems Design, Implementation, and Operation. ed. / Guangdong Zhu; Marc Roger; Zhifeng Wang. SPIE, 2023. 1267104 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 12671).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Wisniewski, HJ, Arnold, IJ, Kim, D, Zuo, H & Chalifoux, BD 2023, Grating-Embedded Mirrors for Heliostat tracking error metrology. in G Zhu, M Roger & Z Wang (eds), Advances in Solar Energy: Heliostat Systems Design, Implementation, and Operation., 1267104, Proceedings of SPIE - The International Society for Optical Engineering, vol. 12671, SPIE, Advances in Solar Energy: Heliostat Systems Design, Implementation, and Operation 2023, San Diego, United States, 8/20/23. https://doi.org/10.1117/12.2677723

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title = "Grating-Embedded Mirrors for Heliostat tracking error metrology",

abstract = "Concentrated solar power (CSP) plants need to monitor the surface slope error of thousands of heliostats with sub-milliradian accuracy. We present grating embedded mirrors (GEMs) and the accompanying Diffractive Auto-Stigmatic Hartmann Camera (DASHCam) metrology system for measuring heliostat surface slopes. GEMs have multiple phase diffraction gratings written within a glass mirror substrate using an ultrafast laser. The gratings direct a small fraction of incident light to non-specular directions, which the DASHCam senses from a virtual center of curvature to measure the facet slopes at each grating location. Our results show, in a laboratory environment, 24 µrad RMS measurement repeatability and 47 µrad RMS accuracy, with single-shot image capture. GEMs and DASHCam are a compact, accurate, and high-speed heliostat slope error metrology system that is robust to the harsh environmental conditions at CSP plants.",

keywords = "Grating-embedded mirrors, Heliostat, Heliostat metrology, Heliostat tracking error, Ultrafast laser applications, Ultrafast laser grating writing",

author = "Wisniewski, {Hayden J.} and Arnold, {Ian J.} and Daewook Kim and Heng Zuo and Chalifoux, {Brandon D.}",

note = "Publisher Copyright: {\textcopyright} 2023 SPIE.; Advances in Solar Energy: Heliostat Systems Design, Implementation, and Operation 2023 ; Conference date: 20-08-2023 Through 22-08-2023",

year = "2023",

doi = "10.1117/12.2677723",

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AU - Wisniewski, Hayden J.

AU - Arnold, Ian J.

AU - Kim, Daewook

AU - Zuo, Heng

AU - Chalifoux, Brandon D.

PY - 2023

Y1 - 2023

N2 - Concentrated solar power (CSP) plants need to monitor the surface slope error of thousands of heliostats with sub-milliradian accuracy. We present grating embedded mirrors (GEMs) and the accompanying Diffractive Auto-Stigmatic Hartmann Camera (DASHCam) metrology system for measuring heliostat surface slopes. GEMs have multiple phase diffraction gratings written within a glass mirror substrate using an ultrafast laser. The gratings direct a small fraction of incident light to non-specular directions, which the DASHCam senses from a virtual center of curvature to measure the facet slopes at each grating location. Our results show, in a laboratory environment, 24 µrad RMS measurement repeatability and 47 µrad RMS accuracy, with single-shot image capture. GEMs and DASHCam are a compact, accurate, and high-speed heliostat slope error metrology system that is robust to the harsh environmental conditions at CSP plants.

AB - Concentrated solar power (CSP) plants need to monitor the surface slope error of thousands of heliostats with sub-milliradian accuracy. We present grating embedded mirrors (GEMs) and the accompanying Diffractive Auto-Stigmatic Hartmann Camera (DASHCam) metrology system for measuring heliostat surface slopes. GEMs have multiple phase diffraction gratings written within a glass mirror substrate using an ultrafast laser. The gratings direct a small fraction of incident light to non-specular directions, which the DASHCam senses from a virtual center of curvature to measure the facet slopes at each grating location. Our results show, in a laboratory environment, 24 µrad RMS measurement repeatability and 47 µrad RMS accuracy, with single-shot image capture. GEMs and DASHCam are a compact, accurate, and high-speed heliostat slope error metrology system that is robust to the harsh environmental conditions at CSP plants.

KW - Grating-embedded mirrors

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KW - Heliostat metrology

KW - Heliostat tracking error

KW - Ultrafast laser applications

KW - Ultrafast laser grating writing

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A2 - Roger, Marc

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PB - SPIE

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ER -

Grating-Embedded Mirrors for Heliostat tracking error metrology

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Keywords

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