Dynamic testbed demonstration of WFIRST coronagraph low order wavefront sensing and control (LOWFS/C)

Shi, Fang; An, Xin; Balasubramanian, Kunjithapatham; Cady, Eric J.; Kern, Brian; Lam, Raymond; Marx, David S.; Prada, Camilo Mejia; Moody, Dwight; Patterson, Keith; Poberezhskiy, Ilya; Seo, Byoung-Joon; Shields, Joel; Sidick, Erkin; Tang, Hong; Trauger, John T.; Truong, Tuan; White, Victor; Wilson, Daniel W.; Zhou, Hanying

doi:10.1117/12.2274887

“…When, stacking the real and imaginary parts of allÊ OL ij (k − 1) into a column vectorÊ OL (k − 1), the control deviation is given by Eqs. (29) and (30),…”

Section: A Dark Hole Maintenance Algorithmmentioning

confidence: 96%

Dark Hole Maintenance and A Posteriori Intensity Estimation in the Presence of Speckle Drift in a High-contrast Space Coronagraph

Pogorelyuk

¹

,

Kasdin

²

2019

ApJ

Get access via publisher Add to dashboard Cite

Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.

show abstract

“…The Roman Space Telescope CGI will make use of a spatially filtered version of the ZWFS to sense and correct low-order wavefront errors using light reflected off the coronagraph focal plane mask (FPM). [29][30][31][32] When used without spatial filtering in the image plane, the spatial resolution of a ZWFS is limited by the number of detector pixels across the beam. For context, the ZWFS is also similar in principle to a point-diffraction interferometer.…”

Section: Introductionmentioning

confidence: 99%

Wavefront sensing and control in space-based coronagraph instruments using Zernike’s phase-contrast method

Ruane

¹

,

Wallace

²

,

Steeves

³

et al. 2020

J. Astron. Telesc. Instrum. Syst.

Self Cite

Get access via publisher Add to dashboard Cite

Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.

show abstract

“…However, because of the finite stellar diameter (~1 mas for a G type star at 10 pc) even with the charge 4 VVC, pointing jitter as low as 0.4 mas is required 5 . In summary, both sensing and correcting rigid body motion of the front end optics will be required to maintain a high contrast dark hole.…”

Section: Laser Gaugesmentioning

confidence: 99%

“…The signals can be fed back to a focus mirror (or a deformable mirror) and a pointing control mirror and subsequently off-loaded to the spacecraft attitude control system. However, this technique has not been demonstrated in the lab for jitter and wavefront control at the 10 -11 contrast level even for bright host stars [5] . The problem will become increasingly difficult as the magnitude of the host star diminishes.…”

Section: Introductionmentioning

confidence: 99%

Wavefront sensing for a future HabEx space telescope

Nissen

¹

,

Martin

²

2017

Proceedings of the Adaptive Optics for Extremely Large Telescopes 5

2

0

Get access via publisher Add to dashboard Cite

Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.

show abstract

Dynamic testbed demonstration of WFIRST coronagraph low order wavefront sensing and control (LOWFS/C)

Cited by 36 publications

References 13 publications

Dark Hole Maintenance and A Posteriori Intensity Estimation in the Presence of Speckle Drift in a High-contrast Space Coronagraph

Dark Hole Maintenance and A Posteriori Intensity Estimation in the Presence of Speckle Drift in a High-contrast Space Coronagraph

Wavefront sensing and control in space-based coronagraph instruments using Zernike’s phase-contrast method

Wavefront sensing for a future HabEx space telescope

Contact Info

Product

Resources

About