Advanced wavefront sensing and control testbed (AWCT)

Basinger, Scott A.; Díaz, Rosemary; Gappinger, Robert O.; Tang, Hong; Lam, Raymond; Sidick, Erkin; Hein, Randall C.; Rud, Mayer; Troy, Mitchell

doi:10.1117/12.858304

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…The testbed was described in details in Ref. [6], so its description will not be repeated here. The sub-images produced by this testbed have a size of about 35x35 pixels.…”

Section: Differential-modementioning

confidence: 99%

“…This is usually the case in an optical system laboratory. We have evaluated the differential-mode shift estimate accuracy of the APC algorithm using some image data obtained on the Advanced Wavefront-sensing and Control Testbed (AWCT) at Jet Propulsion Laboratory (JPL), California Institute of Technology [6]. The testbed was described in details in Ref.…”

Section: Differential-modementioning

confidence: 99%

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Extended scene SH wavefront sensor algorithm: Minimization of scene content dependent shift estimation errors

Sidick

2012

2012 IEEE Aerospace Conference

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Adaptive Periodic-Correlation (APC) algorithm was developed for use in extended-scene Shack-Hartmann wavefront sensors. It provides high-accuracy even when the sub-images in a frame captured by a Shack-Hartmann camera are not only shifted but also distorted relative to each other. Recently we found that the shift-estimate error of the APC algorithm has a component that depends on the content of extended-scene. In this paper we assess the amount of that error and propose a method to minimize it.

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“…The testbed was described in details in Ref. [6], so its description will not be repeated here. The sub-images produced by this testbed have a size of about 35x35 pixels.…”

Section: Differential-modementioning

confidence: 99%

Section: Differential-modementioning

confidence: 99%

Extended scene SH wavefront sensor algorithm: Minimization of scene content dependent shift estimation errors

Sidick

2012

2012 IEEE Aerospace Conference

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“…We have evaluated the differential mode shift estimate accuracy of the APC algorithm using some image data measured on the advanced wavefrontsensing and control testbed (AWCT) at Jet Propulsion Laboratory (JPL), California Institute of Technology. The testbed was described in detail in [7], so its description will not be repeated here. Figure 1 is an example of the measured extendedscene SHC image used in this study, and Fig.…”

Section: A Differential Modementioning

confidence: 99%

Extended scene Shack–Hartmann wavefront sensor algorithm: minimization of scene content dependent shift estimation errors

Sidick

2013

Appl. Opt.

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An adaptive periodic-correlation (APC) algorithm was developed for use in extended-scene Shack-Hartmann wavefront sensors. It provides high accuracy even when the subimages in a frame captured by a Shack-Hartmann camera are not only shifted but also distorted relative to each other. Recently we found that the shift estimate error of the APC algorithm has a component that depends on the content of the extended scene. In this paper, we assess the amount of that error and propose a method to minimize it.

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Detection and closed-loop control of piston errors for a Fizeau imaging interferometer

et al. 2020

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In the Fizeau imaging interferometer testbed we recently built, the optical path difference (OPD; i.e., piston error) among three sub-telescopes should be corrected for phased imaging to enhance the spatial resolution. This study presents the detection of the OPD via a dispersed fringe sensor (DFS) method and its closed-loop control. The retrieval of the OPD from a dispersed fringe map is a fast-Fourier-transform-based DFS method, which indicates in theory that the OPD has a linear relationship with the displacement of the secondary peaks in the Fourier spectrum of the dispersed fringe map. Then the design and alignment of the OPD detection module are presented, as well as the OPD compensation module with a two-level motion stage. A unique benefit of the fast-Fourier-transform-based DFS is high time efficiency for closed-loop control; for a window of 32 × 128 p i x e l s , a 932 Hz computation rate was achieved by dedicated electrical hardware, which is significant for the distributed satellite formation-flying platform. The experiments validated (1) that the detection range of the DFS is more than ± 160 µ m , (2) that the OPD has a fine-line relationship with the secondary peak displacement, (3) the feasibility of the DFS method used for closed-loop control, and (4) that an OPD control precision of 0.0593 µm RMS is achieved.

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Advanced wavefront sensing and control testbed (AWCT)

Cited by 3 publications

References 9 publications

Extended scene SH wavefront sensor algorithm: Minimization of scene content dependent shift estimation errors

Extended scene SH wavefront sensor algorithm: Minimization of scene content dependent shift estimation errors

Extended scene Shack–Hartmann wavefront sensor algorithm: minimization of scene content dependent shift estimation errors

Detection and closed-loop control of piston errors for a Fizeau imaging interferometer

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