Abstract
One of the major challenges of optical fabrication is measurement of the surface when first polished out, before its figure is within the capture range of interferometry. A high dynamic range instrument with good accuracy is needed to efficiently guide the processing. Our approach is to use the Software Configurable Optical Test System (SCOTS), a deflectometry technique that uses a camera and liquid crystal display to measure the surface slope. We describe the use of SCOTS in the fabrication of a 6.5 m on-axis mirror and an 8.4 m off-axis mirror segment (Giant Magellan Telescope primary). SCOTS has the dynamic range to measure high slope errors early in the mirror figuring process, with sufficient accuracy to corroborate later interferometric measurements. Accurately measuring low order figure errors with SCOTS requires careful calibration of the system geometry. Details of the data collection and processing, and comparison to interferometry measurements are presented.
| Original language | English (US) |
|---|---|
| Title of host publication | Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III |
| Editors | Roland Geyl, Ramon Navarro |
| Publisher | SPIE |
| Volume | 10706 |
| ISBN (Print) | 9781510619654 |
| DOIs | |
| State | Published - Jan 1 2018 |
| Event | Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III 2018 - Austin, United States Duration: Jun 10 2018 → Jun 15 2018 |
Other
| Other | Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III 2018 |
|---|---|
| Country | United States |
| City | Austin |
| Period | 6/10/18 → 6/15/18 |
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Keywords
- Aspheric
- Deflectometry
- GMT
- Metrology
- Telescope
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering
Cite this
Measurement of large on-axis and off-axis mirrors using software configurable optical test system (SCOTS). / Lowman, Andrew E.; Smith, Gregory A; Harrison, Lori; West, Steven C.; Oh, Chang Jin.
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III. ed. / Roland Geyl; Ramon Navarro. Vol. 10706 SPIE, 2018. 107061E.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Measurement of large on-axis and off-axis mirrors using software configurable optical test system (SCOTS)
AU - Lowman, Andrew E.
AU - Smith, Gregory A
AU - Harrison, Lori
AU - West, Steven C.
AU - Oh, Chang Jin
PY - 2018/1/1
Y1 - 2018/1/1
N2 - One of the major challenges of optical fabrication is measurement of the surface when first polished out, before its figure is within the capture range of interferometry. A high dynamic range instrument with good accuracy is needed to efficiently guide the processing. Our approach is to use the Software Configurable Optical Test System (SCOTS), a deflectometry technique that uses a camera and liquid crystal display to measure the surface slope. We describe the use of SCOTS in the fabrication of a 6.5 m on-axis mirror and an 8.4 m off-axis mirror segment (Giant Magellan Telescope primary). SCOTS has the dynamic range to measure high slope errors early in the mirror figuring process, with sufficient accuracy to corroborate later interferometric measurements. Accurately measuring low order figure errors with SCOTS requires careful calibration of the system geometry. Details of the data collection and processing, and comparison to interferometry measurements are presented.
AB - One of the major challenges of optical fabrication is measurement of the surface when first polished out, before its figure is within the capture range of interferometry. A high dynamic range instrument with good accuracy is needed to efficiently guide the processing. Our approach is to use the Software Configurable Optical Test System (SCOTS), a deflectometry technique that uses a camera and liquid crystal display to measure the surface slope. We describe the use of SCOTS in the fabrication of a 6.5 m on-axis mirror and an 8.4 m off-axis mirror segment (Giant Magellan Telescope primary). SCOTS has the dynamic range to measure high slope errors early in the mirror figuring process, with sufficient accuracy to corroborate later interferometric measurements. Accurately measuring low order figure errors with SCOTS requires careful calibration of the system geometry. Details of the data collection and processing, and comparison to interferometry measurements are presented.
KW - Aspheric
KW - Deflectometry
KW - GMT
KW - Metrology
KW - Telescope
UR - http://www.scopus.com/inward/record.url?scp=85053478667&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85053478667&partnerID=8YFLogxK
U2 - 10.1117/12.2313855
DO - 10.1117/12.2313855
M3 - Conference contribution
SN - 9781510619654
VL - 10706
BT - Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III
A2 - Geyl, Roland
A2 - Navarro, Ramon
PB - SPIE
ER -