Wide Field Scanning Telescope Using MEMS Deformable Mirrors

Scott, Charles E.; Potsaid, Benjamin; Wen, John T.

doi:10.1080/15599612.2010.513720

Cited by 7 publications

(3 citation statements)

References 16 publications

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“…Depending on the image geometry and level of distortion, it is sometimes preferable to determine field of view (FOV) in terms of horizontal and vertical distances, or in terms of maximum angular extent. In our system, the FOV was 8.9 cm (7.3°) in the horizontal direction and 6.7 cm (5.4°) in the vertical direction 44 …”

Section: Methodsmentioning

confidence: 97%

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Performance test methods for near‐infrared fluorescence imaging

et al. 2020

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Purpose: Near-infrared fluorescence (NIRF) imaging using exogenous contrast has gained much attention as a technique for enhancing visualization of vasculature using untargeted agents, as well as for the detection and localization of cancer with targeted agents. In order to address the emerging need for standardization of NIRF imaging technologies, it is necessary to identify the best practices suitable for objective, quantitative testing of key image quality characteristics. Toward the development of a battery of test methods that are rigorous yet applicable to a wide variety of devices, we have evaluated techniques for phantom design, measurement, and calculation of specific performance metrics. Methods: Using a NIRF imaging system for indocyanine green imaging, providing excitation at 780 nm and detection above 830 nm, we explored methods to evaluate uniformity, field of view, spectral crosstalk, spatial resolution, depth of field, sensitivity, linearity, and penetration depth. These measurements were performed using fluorophore-doped multiwell plate and high turbidity planar phantoms, as well as a 3D-printed multichannel phantom and a USAF 1951 resolution target. Results and Conclusions: Based on a wide range of approaches described in medical and fluorescence imaging literature, we have developed and demonstrated a cohesive battery of test methods for evaluation of fluorescence image quality in wide-field imagers. We also propose a number of key metrics that can facilitate direct, quantitative comparison of device performance. These methods have the potential to facilitate more uniform evaluation and inter-comparison of clinical and preclinical imaging systems than is typically achieved, with the long-term goal of establishing international standards for fluorescence image quality assessment.

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Section: Methodsmentioning

confidence: 97%

“…In our system, the FOV was 8.9 cm (7.3°) in the horizontal direction and 6.7 cm (5.4°) in the vertical direction. 44…”

Section: A Nirf Imaging Systemmentioning

confidence: 99%

Performance test methods for near‐infrared fluorescence imaging

et al. 2020

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“…Microelectromechanical deformable mirror technology 1 has found a variety of uses, from adaptive optics for correction of atmospheric turbulence 2 and in-vivo imaging of the human retina, 3 to a design for a wide-field scanning telescope 4 and maximizing the contrast of a nulling interferometer for exoplanet imaging. 5 Deformable Mirror (DM)s are a critical technology for planned internal space coronagraphs to directly image extrasolar planets.…”

Section: Introductionmentioning

confidence: 99%

Design of the deformable mirror demonstration CubeSat (DeMi)

Douglas

Cahoy

Merck

et al. 2017

Techniques and Instrumentation for Detection of Exoplanets VIII

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The Deformable Mirror Demonstration Mission (DeMi) was recently selected by DARPA to demonstrate in-space operation of a wavefront sensor and Microelectromechanical system (MEMS) deformable mirror (DM) payload on a 6U CubeSat. Space telescopes designed to make high-contrast observations using internal coronagraphs for direct characterization of exoplanets require the use of high-actuator density deformable mirrors. These DMs can correct image plane aberrations and speckles caused by imperfections, thermal distortions, and diffraction in the telescope and optics that would otherwise corrupt the wavefront and allow leaking starlight to contaminate coronagraphic images. DeMi is provide on-orbit demonstration and performance characterization of a MEMS deformable mirror and closed loop wavefront sensing.The DeMi payload has two operational modes, one mode that images an internal light source and another mode which uses an external aperture to images stars. Both the internal and external modes include image plane and pupil plane wavefront sensing. The objectives of the internal measurement of the 140-actuator MEMS DM actuator displacement are characterization of the mirror performance and demonstration of closed-loop correction of aberrations in the optical path. Using the external aperture to observe stars of magnitude 2 or brighter, assuming 3-axis stability with less than 0.1 degree of attitude knowledge and jitter below 10 arcsec RMSE, per observation, DeMi will also demonstrate closed loop wavefront control on an astrophysical target. We present an updated payload design, results from simulations and laboratory optical prototyping, as well as present our design for accommodating high-voltage multichannel drive electronics for the DM on a CubeSat.

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Quantitative Determination of 3D-Printing and Surface-Treatment Conditions for Direct-Printed Microfluidic Devices

Namgung

Kaba

et al. 2022

BioChip J

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Wide Field Scanning Telescope Using MEMS Deformable Mirrors

Cited by 7 publications

References 16 publications

Performance test methods for near‐infrared fluorescence imaging

Performance test methods for near‐infrared fluorescence imaging

Design of the deformable mirror demonstration CubeSat (DeMi)

Quantitative Determination of 3D-Printing and Surface-Treatment Conditions for Direct-Printed Microfluidic Devices

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