Zobrazeno 1 - 10
of 48
pro vyhledávání: '"Mark A. Ealey"'
Autor:
Mark A. Ealey, Gary H. Blackwood
Publikováno v:
Smart Materials and Structures. 2:124-133
Lead magnesium niobate (Pb(Mg1/3Nb2/3)O3 or PMN) exhibits many attractive properties required by actuators for precision submicron control. At room temperature hysteresis is negligible, thermal expansion is less than 1 microstrain degrees C-1, and th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7979112c994aa1ff89b19b7fcbc31354
https://doi.org/10.1088/0964-1726/2/2/008
https://doi.org/10.1088/0964-1726/2/2/008
Autor:
Mark A. Ealey, Maureen L. Mulvihill
Publikováno v:
SPIE Proceedings.
Xinetics has been investigating ferroelectric actuator materials to meet the greater amplitude and higher bandwidth operation for the large mirror actuators of the 21st Century. This class of actuators features precision displacement control in terms
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::409ecf01149d4ef18275061c68f579b5
https://doi.org/10.1117/12.512730
https://doi.org/10.1117/12.512730
Autor:
Mark A. Ealey
Publikováno v:
SPIE Proceedings.
Conventional telescopes whether for ground or space feature a highly accurate primary mirror coupled to a secondary and other mirrors using a stiff metering structure. In the last decade, significant progress has been made in aperture size (8 to 10-m
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::09d1548c8e3d306388bd375222e9cc25
https://doi.org/10.1117/12.512726
https://doi.org/10.1117/12.512726
Autor:
John A. Wellman, Mark A. Ealey
Publikováno v:
SPIE Proceedings.
Large optics for space will undergo a revolutionary change in the early 21st century. Conventional discrete manufacturing technology will be replaced by an integrated materials approach conducted on the mesoscale level. Integrated Zonal Meniscus is a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::41186385db73e40c2c47f1ab8e9f9d69
https://doi.org/10.1117/12.512728
https://doi.org/10.1117/12.512728
Autor:
Maureen L. Mulvihill, Michael E. Roche, Mark A. Ealey, Zaffir A. Chaudhry, Ryan J. Shawgo, Jeffrey L. Cavaco
Publikováno v:
SPIE Proceedings.
Xinetics is working with NASA to develop a cryogenic deformable mirror (DM) specific to the needs of future Origins Program missions such as TPF and JWST. Of utmost importance was the development of an electroceramic material that exhibited electrost
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bab5dfc9076a8f5fd3f580f57177e8d5
https://doi.org/10.1117/12.506269
https://doi.org/10.1117/12.506269
Publikováno v:
SPIE Proceedings.
First and foremost, an optical material must be able to be cost effectively made to the desired size and shape and then be polished to optical tolerances. Over the past 15 years, reaction bonded silicon carbide has been scaled from 2 inches to 1.2 me
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::682869daef86f5fe74e1881290436576
https://doi.org/10.1117/12.284709
https://doi.org/10.1117/12.284709
Publikováno v:
SPIE Proceedings.
Helicopter design is limited by the compromise inherent in meeting hover and forward flight requirements, and the unsteady environment encountered in forward flight. Active control of helicopter rotors using smart material, in-blade actuation can ove
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6d5fb68dacc821e64cfdddc449d8939f
https://doi.org/10.1117/12.274701
https://doi.org/10.1117/12.274701
Publikováno v:
SPIE Proceedings.
Over the past decade, the principle focus in the lead magnesium niobate (PMN) family of relaxor ferroelectric ceramics has been on the electrostrictive formulation due mainly to its application in deformable optics. Electrostrictive response of the P
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3bed5da8ae87ef0b7cc3b0ecb559e98f
https://doi.org/10.1117/12.259038
https://doi.org/10.1117/12.259038
Autor:
George S. Surprenant, Mark A. Ealey
Publikováno v:
SPIE Proceedings.
Multilayer actuators are being used in optical communications, large-scale telescopes, semiconductor processing, medical imaging, and a host of optical instruments which need submicron control. PMN multilayer actuators have hysteresis which is less t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d519b6c4a0eb1b46ccfb7a7cb42bd5fd
https://doi.org/10.1117/12.259041
https://doi.org/10.1117/12.259041
Publikováno v:
SPIE Proceedings.
Energy density is the key to higher authority actuators. New generation electroceramics, such as temperature stabilized lead magnesium niobate (PMN), generate large forces which can do work in adaptive structures. Ever increasing induced- strains and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a219d61207e0f1ac16526a40780e1d62
https://doi.org/10.1117/12.259039
https://doi.org/10.1117/12.259039