Image-based wavefront sensing and control experiments
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NGST wavefront sensing wavefront control segmented↗
Engineering topics
Basinger, S.
Publications and source records attributed to Basinger, S..
NGST wavefront sensing and control
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NGST wavefront sensing wavefront control segmented↗
Segmented mirror coarse phasing with a dispersed fringe sensor: experiments on NGST's wavefront control testbed
A piston sensing and control algorithm for the segmented mirror coarse phasing using a dispersed fringe sensor (DFS) has been developed for Next Generation Space Telescope (NGST) wavefront sensing and control. The DFS can detect residual piston errors as large as order of a depth-of-focus and can phase the segment mirrors with an accuracy less than 0.1 micron, which is within the capture range of the fine phasing for NGST. A series of experiments has been carried out on the NGST's Wavefront Control Testbed (WCT) to validate the modeling results, evaluate the DFS performance, and systematically explore the factors that affect the DFS performance. This paper reports the testbed results for several critical issues of DFS performance, including DFS dynamic range, accuracy, fringe visibility, and the effects of segment mirror aberrations.
Space↗
Segmented mirror coarse phasing with white light interferometry: modeling and experiment on NGST's wavefront control testbed
A method of coarse phasing segmented mirrors using white light interferometry (WLI) has been developed for Next Generation Space Telescope (NGST) wavefront sensing and control. Using the broadband point spread function (PSF) of the segmented mirrors taken during a segment piston scan, the WLI can accurately detect small residual piston errors. WLI does not rely on any extra optics and uses only the final imaging camera. With its high sensitivity to small segment piston error WLI can be used as a complementary phasing algorithm to the dispersed fringe sensor (DFS) for NGST. The paper will present the results from modeling and experiment on the NGST's Wavefront Control Testbed (WCT).
Space↗
JPL phase retrieval camera
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phase retrieval↗
JPL phase retrieval camera
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phase retrieval NGST↗
White light fringe estimation: algorithms, error sources and mitigation strategies
This paper addresses the problem of highly accurate phase estimation at low light levels, as required by the Space Interferometry Mission (SIM).
fringe estimation quasimonochromatic↗
Phase Retrieval Results on Segmented Telescope Testbed
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phase retrieval NGST↗
Experiment of Segment Mirrors Initial Capture, Coarse Alignment and Coarse Phasing on WCT-2
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wavefront sensing and control segmented mirror nex↗
NGST wavefront control
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wavefront control space telescopes NGST↗
Wavefront Control for a Segmented Deployable Space Telescope
By segmenting and folding the primary mirror, quite large telescopes can be packed into the nose cone of a rocket.
adaptive↗
Average Phase Calculations with Near-Field Diffraction Algorithms for the Space Interferometry Mission
This work reports on the computation of the average phase of a beam over an optical element via discrete Fourier transform techniques.
discrete↗
DCATT Dispersed Fringe Sensor: Modeling and Experimenting with the Transmissive Phase Plates
Control algorithms developed for coarse phasing the segmented mirrors of the Next Generation Space Telescope (NGST)are being tested in realistic modeling and on the NGST wavefront control testbed, also known as DCATT.
space↗
Telescope Simulator for the Nexus Wavefront Control Testbed
A telescope simulator was built as part of the Nexus wavefront control testbed, an NGST technology experiment at NASA's Goddard Space Flight Center.
NGST↗
Performance of the NGST Wavefront Control System as Tested on DCATT
The NGST wavefront control testbed (also known as DCATT) is being used to map out the accuracy and dynamic range of the baseline NGST wavefront control system.
wavefront control large optics wave front sensing ↗
DCATT Dispersed Fringe Sensor (DFS) -- Modeling and Experiment with Transmissive Phase Plates
The alignment and phasing control of NGST's segment primary mirrors use images from the science camera instead of dedicated instruments.
Wavefront sensing wavefront correction dispersed f↗
Controlling the DCATT/NEXCAT Hardware
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DCATT/NEXCAT NGST hardware↗
NGST Wavefront Control: Lessons Learned from DCATT and Nexu
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NGST Wavefront Control NGST Lessons DCATT Nexu↗