![]() ![]() The DeMi mission underwent environmental testing in Fall 2019 and was launched in February 15th, 2020. The final payload design contains a 35-mm primary mirror, an internal calibration laser light source, a 140-actuator Multi MEMS DM from Boston Micromachines Corporation (BMC), a Shack Hartmann wavefront sensor, and an image plane wavefront sensor. The DeMi payload was assembled for flight in the Summer-Fall of 2019. The final optical and electronics design was an iterative process which was not complete until final integration and testing. The DeMi payload has evolved over several years in order to improve the design fidelity, redundancy, and versatility of the instrument ( Cahoy et al., 2013a Marinan and Cahoy, 2014 Marinan, 2016 Marinan et al., 2016 Douglas et al., 2017 Allan et al., 2018 Morgan, 2019). The DeMi mission goal is to demonstrate MEMS mirror operation in space for an extended period of time. Closely related to the continuous phase-sheet mirrors described here are segmented deformable mirrors, which allow other applications such as image slicing and data transmission ( Chan and Ford, 2006). (2020)), wavefront control for optical space interferometry, and biological and in-vivo microscopy ( Bifano, 2011 Wahl et al., 2015 Marx, 2017) in space. These include correcting thermal and deployment errors on future small space telescopes (e.g. While much of the interest in DM technology in space has been for large-scale missions with apertures of several meters or larger, there is a large continuum of nanosatellite applications for the technology. ![]() For a detailed review of MEMS operation and testing in space and space-like environments see Morgan et al. Micro-electromechanical systems (MEMS) Deformable Mirror (DM)s are included in designs for many future exoplanet imaging missions due to relatively high actuator counts which allow correction of high-order spatial errors, and low Size, Weight, and Power (SWaP) ( Pueyo et al., 2019). Details of the implementation are provided to establish technology readiness level (TRL) and provide a foundation for understanding future application of active wavefront control on satellites.ĭeformable mirrors which actively change shape at sub-wavelength precision have a wide array of applications in space, such as future missions to image Earth-like exoplanets ( Levine et al., 2009 Stapelfeldt et al., 2014 Pueyo et al., 2019 Ruane et al., 2019 Gaudi et al., 2020 Kasdin et al., 2020), correction of scattered light imaging of dim debris disks ( Chakrabarti et al., 2015 Cook et al., 2015 Sirbu et al., 2015 Douglas et al., 2018 Maier et al., 2020), reconfigurable telescopes ( Underwood et al., 2015), and error correction for deployable or inflatable apertures ( Dolkens et al., 2019 Lesser et al., 2019). This work provides an overview of the design considerations and engineering of the Deformable Mirror Demonstration Mission optical payload. The 6U CubeSat was launched on Februand deployed from the International Space Station on July 13, 2020. This work describes the instrument design drivers and CubeSat implementation, and briefly illustrates operation on orbit by comparing ground-based measurements of a displaced actuator to an on-orbit measurement using the internal laser source. In the DeMi payload, a Shack Hartmann lenslet array based wavefront sensor monitors the deformable mirror, illuminated by either an internal 636 nm laser diode or external starlight. Hence, they have the potential of improving contrast in coronagraphs on future space telescopes. Such mirrors can provide precise wavefront control with low size, weight, and power per actuator. The Deformable Mirror Demonstration Mission (DeMi) is a technology demonstration CubeSat to test a 140 actuator micro-electromechanical system (MEMS) deformable mirror in low-Earth orbit. 5Department of Earth, Atmospheric and Planetary Sciences, Cambridge, MA, United States.4Aurora Flight Sciences, Cambridge, MA, United States.3Department of Physics, California Institute of Technology, Pasadena, CA, United States.2Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, Cambridge, MA, United States.1Department of Astronomy/Steward Observatory, University of Arizona, Tucson, AZ, United States.Holden 2 Jennifer Gubner 2 Christian Haughwout 2 Paula do Vale Pereira 2 Yinzi Xin 2,3 John Merk 4 Kerri L. Douglas 1,2* Greg Allan 2 Rachel Morgan 2 Bobby G. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |