Modeling the effect of high altitude turbulence in wide-field correlating wavefront sensing and its impact on the performance of solar AO systems

2014 ◽  
Author(s):  
I. Montilla ◽  
M. Tallon ◽  
M. Langlois ◽  
C. Béchet ◽  
M. Collados Vera
Keyword(s):  
High Altitude ◽  
Wavefront Sensing ◽  
Wide Field

scholarly journals MEMS Deformable Mirrors for Space-Based High-Contrast Imaging

Micromachines ◽  
2019 ◽  
Vol 10 (6) ◽  
pp. 366 ◽  
Author(s):  
Rachel E. Morgan ◽  
Ewan S. Douglas ◽  
Gregory W. Allan ◽  
Paul Bierden ◽  
Supriya Chakrabarti ◽  
...  
Keyword(s):  
High Altitude ◽  
Space Environment ◽  
Optical Systems ◽  
Sounding Rocket ◽  
Deformable Mirrors ◽  
Wide Field ◽  
High Contrast ◽  
Contrast Imaging ◽  
Wavefront Control ◽  
High Contrast Imaging

Micro-Electro-Mechanical Systems (MEMS) Deformable Mirrors (DMs) enable precise wavefront control for optical systems. This technology can be used to meet the extreme wavefront control requirements for high contrast imaging of exoplanets with coronagraph instruments. MEMS DM technology is being demonstrated and developed in preparation for future exoplanet high contrast imaging space telescopes, including the Wide Field Infrared Survey Telescope (WFIRST) mission which supported the development of a 2040 actuator MEMS DM. In this paper, we discuss ground testing results and several projects which demonstrate the operation of MEMS DMs in the space environment. The missions include the Planet Imaging Concept Testbed Using a Recoverable Experiment (PICTURE) sounding rocket (launched 2011), the Planet Imaging Coronagraphic Technology Using a Reconfigurable Experimental Base (PICTURE-B) sounding rocket (launched 2015), the Planetary Imaging Concept Testbed Using a Recoverable Experiment - Coronagraph (PICTURE-C) high altitude balloon (expected launch 2019), the High Contrast Imaging Balloon System (HiCIBaS) high altitude balloon (launched 2018), and the Deformable Mirror Demonstration Mission (DeMi) CubeSat mission (expected launch late 2019). We summarize results from the previously flown missions and objectives for the missions that are next on the pad. PICTURE had technical difficulties with the sounding rocket telemetry system. PICTURE-B demonstrated functionality at >100 km altitude after the payload experienced 12-g RMS (Vehicle Level 2) test and sounding rocket launch loads. The PICTURE-C balloon aims to demonstrate 10 - 7 contrast using a vector vortex coronagraph, image plane wavefront sensor, and a 952 actuator MEMS DM. The HiClBaS flight experienced a DM cabling issue, but the 37-segment hexagonal piston-tip-tilt DM is operational post-flight. The DeMi mission aims to demonstrate wavefront control to a precision of less than 100 nm RMS in space with a 140 actuator MEMS DM.

Adaptive optics wide-field microscopy using direct wavefront sensing

2011 ◽  
Vol 36 (6) ◽  
pp. 825 ◽  
Author(s):  
Oscar Azucena ◽  
Justin Crest ◽  
Shaila Kotadia ◽  
William Sullivan ◽  
Xiaodong Tao ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Wavefront Sensing ◽  
Wide Field

System Design Of A Wavefront Sensing Package For A Wide Field Of View Optical Phased Array

1988 ◽  
Vol 27 (9) ◽  
Author(s):  
John D. Gonglewski ◽  
Christooher R. De Hainaut ◽  
Curt M. Lampkin ◽  
Raymond C. Dymale
Keyword(s):  
System Design ◽  
Phased Array ◽  
Field Of View ◽  
Wavefront Sensing ◽  
Wide Field ◽  
Wide Field Of View ◽  
Optical Phased Array

Laboratory quantification of a plenoptic wavefront sensor with extended objects

2020 ◽  
Vol 497 (4) ◽  
pp. 4580-4586
Author(s):  
Zhentao Zhang ◽  
Nazim Bharmal ◽  
Tim Morris ◽  
Yonghui Liang
Keyword(s):  
Adaptive Optics ◽  
Closed Loop ◽  
Optical Design ◽  
Wavefront Sensor ◽  
Wavefront Sensing ◽  
Wide Field ◽  
Loop Correction ◽  
Wavefront Correction ◽  
Set Up ◽  
Experimental Bench

ABSTRACT Adaptive optics (AO) is widely used in ground-based telescopes to compensate the effects of atmosphere distortion, and the wavefront sensor is a significant component in the AO systems. The plenoptic wavefront sensor has been proposed as an alternative wavefront sensor adequate for extended objects and wide field of views. In this paper, a experimental bench has been set up to investigate the slope measurement accuracy and closed-loop wavefront correction performance for extended objects. From the experimental results, it has been confirmed that plenoptic wavefront sensor is suitable for extended objects wavefront sensing with proper optical design. The slope measurements have a good linearity and accuracy when observing extended objects. The image quality is significantly improved after closed-loop correction. A method of global tip/tilt measurement using only plenoptic wavefront sensor frame is proposed in this paper, it is also a potential advantage of plenoptic wavefront sensor in extended objects wavefront sensing.

scholarly journals Prospects for the Detection of the Prompt Very-high-energy Emission from γ-ray Bursts with the High Altitude Detection of Astronomical Radiation Experiment

2021 ◽  
Vol 923 (1) ◽  
pp. 112
Author(s):  
Guang-Guang Xin ◽  
Yu-Hua Yao ◽  
Xiang-Li Qian ◽  
Cheng Liu ◽  
Qi Gao ◽  
...  
Keyword(s):  
High Altitude ◽  
Detection Rate ◽  
Gamma Ray ◽  
Theoretical Calculations ◽  
Lorentz Invariance ◽  
Effective Area ◽  
High Energy ◽  
Wide Field ◽  
Very High Energy ◽  
Very High

Abstract The observation of very-high-energy (VHE; > 10 GeV) γ-ray emission from γ-ray bursts (GRBs), especially in the prompt phase, will provide critical information for understanding many aspects of their nature including the physical environment, the relativistic bulk motion, the mechanisms of particle acceleration of GRBs, and for studying Lorentz invariance violation, etc. For the afterglow phase, the highest-energy photons detected to date by the imaging atmospheric Cherenkov telescopes extend to the TeV regime. However, for the prompt phase, years of efforts in searching for the VHE emission has yielded no statistically significant detections. A wide field of view and large effective area above tens of GeV are essential for detecting the VHE emissions from GRBs in the prompt phase. The High Altitude Detection of Astronomical Radiation (HADAR) experiment has such merits. In this paper, we report the estimates of its expected annual GRB detection rate, which are obtained by combining the performance of the HADAR instrument with the theoretical calculations based on a phenomenological model to generate the pseudo-GRB population. The expected detectable gamma-ray signal from GRBs above the background is then obtained to give the detection rate. In the spectral model, an extra component is assigned to every GRB event in addition to the Band function. The results indicate that if the energy of the cutoff due to internal absorption is higher than 50 GeV, the detection rate for GRBs for the HADAR experiment is approximately two or three GRBs per year, which varies slightly depending upon the characteristics of the extra component.

Wide-field wavefront sensing

1998 ◽  
Vol 42 (6-8) ◽  
pp. 455-458 ◽  
Author(s):  
Michael I. Andersen
Keyword(s):  
Wavefront Sensing ◽  
Wide Field

In-orbit wavefront sensing of wide-field line scan space camera with a co-axial three-mirror system

2015 ◽  
Vol 41 (2) ◽  
pp. 166-170
Author(s):  
孙倩倩 SUN Qianqian ◽  
胡新奇 HU Xinqi
Keyword(s):  
Field Line ◽  
Mirror System ◽  
Wavefront Sensing ◽  
Wide Field ◽  
Line Scan
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