LIFT, a noise-effective low order focal-plane sensor: from theory to full experimental validation

2012 ◽  
Author(s):  
Cédric Plantet ◽  
Benoit Neichel ◽  
Serge Meimon ◽  
Thierry Fusco ◽  
Jean-Marc Conan
Keyword(s):  
Focal Plane ◽  
Experimental Validation ◽  
Low Order

scholarly journals Coronagraphic phase diversity through residual turbulence: performance study and experimental validation

2019 ◽  
Vol 488 (3) ◽  
pp. 4307-4316 ◽  
Author(s):  
Olivier Herscovici-Schiller ◽  
Jean-François Sauvage ◽  
Laurent M Mugnier ◽  
Kjetil Dohlen ◽  
Arthur Vigan
Keyword(s):  
Numerical Simulations ◽  
Adaptive Optics ◽  
Focal Plane ◽  
Experimental Validation ◽  
Performance Study ◽  
Current Generation ◽  
Phase Diversity

Abstract Quasi-static aberrations in coronagraphic systems are the ultimate limitation to the capabilities of exoplanet imagers both ground-based and space-based. These aberrations – which can be due to various causes such as optics alignment or moving optical parts during the observing sequence – create light residuals called speckles in the focal plane. Those speckles might be mistaken for planets. For ground-based instruments, the presence of residual turbulent wavefront errors due to partial adaptive optics correction causes an additional difficulty to the challenge of measuring aberrations in the presence of a coronagraph. In this paper, we present an extension of COFFEE, the coronagraphic phase diversity, to the estimation of quasi-static aberrations in the presence of adaptive-optics-corrected residual turbulence. We perform realistic numerical simulations to assess the performance that can be expected on an instrument of the current generation. We perform the first experimental validation in the laboratory, which demonstrates that quasi-static aberrations can be corrected during the observations by means of coronagraphic phase diversity.

A focal plane sensor for low-order sensing on laser tomographic systems: LIFT

2010 ◽  
Author(s):  
Serge Meimon ◽  
Thierry Fusco ◽  
Frederic Cassaing
Keyword(s):  
Focal Plane ◽  
Low Order

scholarly journals Experimental validation of active control of low-order aberrations with a Zernike sensor through a Lyot coronagraph

2021 ◽  
Author(s):  
Raphaël Pourcelot ◽  
Mamadou N'Diaye ◽  
Emiel H. Por ◽  
Marshall D. Perrin ◽  
Rémi Soummer ◽  
...  
Keyword(s):  
Active Control ◽  
Experimental Validation ◽  
Low Order

scholarly journals Experimental validation of LIFT for estimation of low-order modes in low-flux wavefront sensing

2013 ◽  
Vol 21 (14) ◽  
pp. 16337 ◽  
Author(s):  
C. Plantet ◽  
S. Meimon ◽  
J.-M. Conan ◽  
T. Fusco
Keyword(s):  
Experimental Validation ◽  
Wavefront Sensing ◽  
Low Order

scholarly journals Experimental validation of optimization concepts for focal-plane image processing with adaptive optics

2012 ◽  
Author(s):  
Visa Korkiakoski ◽  
Christoph U. Keller ◽  
Niek Doelman ◽  
Rufus Fraanje ◽  
Raluca Andrei ◽  
...  
Keyword(s):  
Image Processing ◽  
Adaptive Optics ◽  
Focal Plane ◽  
Experimental Validation ◽  
Plane Image

scholarly journals On-Sky Demonstration of Low-Order Wavefront Sensing and Control with Focal Plane Phase Mask Coronagraphs

2015 ◽  
Vol 127 (955) ◽  
pp. 857-869 ◽  
Author(s):  
Garima Singh ◽  
Julien Lozi ◽  
Olivier Guyon ◽  
Pierre Baudoz ◽  
Nemanja Jovanovic ◽  
...  
Keyword(s):  
Focal Plane ◽  
Phase Mask ◽  
Wavefront Sensing ◽  
And Control ◽  
Low Order

scholarly journals LIFT: a focal-plane wavefront sensor for real-time low-order sensing on faint sources

2010 ◽  
Vol 35 (18) ◽  
pp. 3036 ◽  
Author(s):  
Serge Meimon ◽  
Thierry Fusco ◽  
Laurent M. Mugnier
Keyword(s):  
Real Time ◽  
Focal Plane ◽  
Wavefront Sensor ◽  
Plane Wavefront ◽  
Low Order

scholarly journals Numerical Simulation and Experimental Validation of the Vibration Modes for a Processing Reciprocating Compressor

2017 ◽  
Vol 2017 ◽  
pp. 1-12
Author(s):  
Ying Zhao ◽  
Jiahao Chen ◽  
Qiang Zhou ◽  
Xiaohan Jia ◽  
Xueyuan Peng
Keyword(s):  
Numerical Simulation ◽  
Experimental Validation ◽  
Shell Element ◽  
Element Model ◽  
Bolted Joints ◽  
Vibration Modes ◽  
Reciprocating Compressor ◽  
Solid Element ◽  
Low Order ◽  
Moving Parts

The low-order vibration modes of a reciprocating compressor were studied by means of numerical simulation and experimental validation. A shell element model, a beam element model, and two solid element models were established to investigate the effects of bolted joints and element types on low-order vibration modes of the compressor. Three typical cases were compared to check the effect of locations of moving parts on the vibration modes of the compressor. A forced modal test with the MRIT (Multiple References Impact Test) technique was conducted to validate the simulation results. Among four numerical models, the solid element model with the bolt-pretension method showed the best accuracy compared with experimental data but the worst computational efficiency. The shell element model is recommended to predict the low-order vibration modes of the compressor with regard to effectiveness and usefulness. The sparsely distributed bolted joints with a small bonded region on the contact surface were key bolted joints that had greater impacts on the low-order vibration modes of the compressor than the densely distributed bolted joints. The positions of the moving parts had little effect on the low-order vibration modes of the compressor.

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