Simultaneous multi-segmented mirror orientation test system using a digital aperture based on sheared Fourier analysis

Choi, Heejoo; Trumper, Isaac; Dubin, Matthew; Zhao, Wenchuan; Kim, Dae Wook

doi:10.1364/oe.25.018152

Cited by 22 publications

(5 citation statements)

References 17 publications

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“…The angular and linear positioning accuracy were identified to be 0.005° and 5 μm, respectively [258]. A similar application has been reported for alignment of multi-segmented mirrors on a polishing machine [31]. A CMOS camera captured images of reflected 2D sinusoidal patterns from seven multi-segmented mirrors for measurement of the surface orientations of the mirror segments with a resolution of 0.16 arcseconds in a time of 0.07 s, based on which the alignment of each mirror segment was carried out.…”

Section: Fringe Reflection (Fringe Deflectometry)supporting

confidence: 69%

On-machine and in-process surface metrology for precision manufacturing

et al. 2019

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On-machine and in-process surface metrology are important for quality control in manufacturing of precision surfaces. The classifications, requirements and tasks of on-machine and in-process surface metrology are addressed. The state-of-the-art on-machine and in-process measurement systems and sensor technologies are presented. Error separation algorithms for removing machine tool errors, which is specially required in on-machine and in-process surface metrology, are overviewed, followed by a discussion on calibration and traceability. Advanced techniques on sampling strategies, measurement systems-machine tools interface, data flow and analysis as well as feedbacks for compensation manufacturing are then demonstrated. Future challenges and developing trends are also discussed.

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Section: Fringe Reflection (Fringe Deflectometry)supporting

confidence: 69%

On-machine and in-process surface metrology for precision manufacturing

et al. 2019

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“…The flexibility of the deflectometry layout and dynamic range has been used for various types of testing, such as simultaneous multi-segmented optics orientation testing and instantaneous optical surface measurement. [15][16][17] The performance of the extended deflectometry showed comparable accuracy with an interferometer. It also showed a far better accuracy than similar dynamic range instruments, as shown in Figure 4 (b).…”

Section: Introduction To Deflectometrymentioning

confidence: 87%

Mid-to-high frequency characterization of inflatable membrane optics

Choi

Palisoc

Pandde

et al. 2021

Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems III

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Inflatable membrane primary optics for space telescopes are a smart approach in the context of saving flight payload weight and volume. The Orbiting Astronomical Satellite for Investigating Stellar systems (OASIS) adopted the membrane architecture for primary optics (primary antenna, A1) to have 20 meter diameter collection area with operation bands at the terahertz frequency. The membrane is made of Kapton or Mylar film with an aluminized surface, and the balloon (transparent surface + aluminized surface) is inflated to work as the convex mirror. In order to leverage the carrying volume advantage of inflatable optics, it must be folded during launch and deployed in orbit. The thin membrane film can crumple easily when it is folded, and it should be ironed out when the telescope is deployed for observation.We studied the microroughness and mid-to-high spatial frequency characteristics of the membrane via optical metrology to evaluate the surface properties. Because it is not of traditional shape and material, it is impossible to test with an offthe-shelf interferometer and profilometer. Moreover, the defect spatial frequency of interest is a few hundred microns to millimeters range, so the measurable field and dynamic range need to be in range of a few centimeters with microns resolution. To meet those requirements for metrology, we developed a flexible optics testbed utilizing deflectometry. The microroughness and mid-to-high frequency properties are measured with a white light interferometer and proposed methodology. The test results show that the candidate membrane is suitable for OASIS and this reliable test will guide the further design study of A1 assembly and optical system error budget.

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“…Developments to improve the coarse alignment of segmented mirrors are on-going and will eventually provide a more efficient and accurate method of positioning the segments. One multisegment alignment technology utilizes a sheared Fourier analysis to obtain the tip/tilt of many mirror segments over a wide dynamic range [203]. This multisegment alignment system uses a similar setup to the deflectometry system used during fabrication, where a 2D sinusoidal pattern is displayed on a screen and the pattern is captured by a camera in reflection from the segments under test.…”

Section: Segmented Mirror Alignmentmentioning

confidence: 99%

mentioning

confidence: 99%

Optics technology for large-aperture space telescopes: from fabrication to final acceptance tests

et al. 2018

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This review paper addresses topics of fabrication, testing, alignment, and as-built performance of reflective space optics for the next generation of telescopes across the x-ray to far-infrared spectrum. The technology presented in the manuscript represents the most promising methods to enable a next level of astronomical observation capabilities for space-based telescopes as motivated by the science community. While the technology to produce the proposed telescopes does not exist in its final form, the optics industry is making steady and impressive progress toward these goals across all disciplines. We hope that through sharing these developments in context of the science objectives, further connections and improvements are enabled to push the envelope of the technology.

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Simultaneous multi-segmented mirror orientation test system using a digital aperture based on sheared Fourier analysis

Cited by 22 publications

References 17 publications

On-machine and in-process surface metrology for precision manufacturing

On-machine and in-process surface metrology for precision manufacturing

Mid-to-high frequency characterization of inflatable membrane optics

Optics technology for large-aperture space telescopes: from fabrication to final acceptance tests

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