TPF-C Technology Plan - Exoplanet Exploration Program - NASA

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Chapter 7 7.5 Structural, Thermal, and Spacecraft Testbeds 7.5.1 Metrology Components Scope The baseline approach is to follow SIM progress on the external metrology truss development while periodically revisiting the project requirements. If for any reason SIM technology is deemed insufficient for TPF-C needs, this task will be expanded to address TPF-C requirements. In addition, as the verification plan matures, metrology requirements will emerge. Any necessary technology development activities will be captured in the next update to this plan. The schedule for metrology components is given in Table 7-11. The metrology components have achieved TRL 3. Table 7-11. Metrology Components Schedule Planned Completion Date Planned Activities Performance Targets TRL Pre-Phase A Study and monitor metrology sensing scheme based on SIM components 3 Phase A Implement metrology scheme on Closedloop Secondary Mirror Position Control Testbed. 6 DOF control to ~50 nm over 24-hour timescale 4 120
Plan for Technology Development 7.5.2 Precision Hexapod Scope The testbed development begins in pre-Phase A with design work and requirements definition. By the end of pre-Phase A the metrology sub-system will demonstrate 15-nm measurement. In Phase A, components and full hexapod systems will be acquired where possible, and designed and built where necessary to develop a baseline concept. In Phase B, the EM of the hexapod system will be designed, fabricated and demonstrated to meet performance requirements. This characterization facility will be used during the I&T program to verify the performance of the flight hexapod. The schedule for the precision hexapod is given in Table 7-12. State of the Art TRL 3 A hexapod built by JPL for SIM in 1997 was designed for a 20 kg payload. It used precision ball screw actuators to achieve a piston accuracy of 1 micron, a pointing accuracy of 3 arcsec, a pointing range of 15 degrees from nominal, and a maximum travel range of 8 cm. The hexapod was designed with low CTE materials and the struts were conductively decoupled from its surroundings to aid with thermal stability. Table 7-12. Precision Hexapod Schedule Planned Completion Date Pre-Phase A Q4 FY05 Pre-Phase A Q2 FY06 Phase A Phase B Phase C/D Planned Activities Performance Targets TRL Planning of the testbed Clearly define the goals and uses of the testbed 3 Proposed initial development of the test-bed facility (pending availability of resources) Characterization of actuators and hexapod systems Characterization of EM hexapod system Utilize the facility to perform initial verification of the flight Hexapod system Demonstrate the ability to measure 6 degrees of freedom to a level of 15 nm over a 5 mm range Procure/fabricate actuator and hexapod systems and characterize using the facility Facility used to verify performance of an EM hexapod system Facility is used to verify the performance of the flight hexapod system 4 5 5 6 121
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JPL Publication 05-8 Technology Pla
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TECHNOLOGY PLAN TERRESTRIAL PLANET
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Recent Highlights Technical progres
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Figure i-4. Deformable mirror deliv
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Table of Contents Approvals........
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7.5.2 Precision Hexapod............
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Chapter 1 Figure 1-1. Artist's impr
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Chapter 1 interferometry, continues
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Chapter 1 Back end coronagraph opti
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Chapter 1 Surrounding the whole tel
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Chapter 1 Pol. BS fold/steering Mic
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Chapter 1 1.6.5 Sunshield The teles
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Chapter 1 expected architecture dow
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Chapter 1 Table 1-3. TPF-C Technolo
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Chapter 1 3B: Demonstrate, using th
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Chapter 2 2 Error Budgets 2.1 Contr
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Chapter 2 Error Budget Validation G
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Chapter 2 Further, it is shown that
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Chapter 2 Table 2-1. Requirement on
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Chapter 3 3 Optics and Starlight Su
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Chapter 3 are in progress with cont
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Chapter 3 Figure 3-5. Coronagraph s
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Chapter 3 (though not light-weight
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Chapter 3 Table 3-3. ITT Metrology
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Chapter 3 observations. The time it
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Chapter 3 vacuum-compatible, low-po
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Chapter 3 blank size. Westerhoff et
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Chapter 3 configurations, performan
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Chapter 3 Figure 3-10: Plots showin
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Chapter 3 The wavefront quality of
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Chapter 3 Figure 3-13. Optical layo
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Chapter 3 algorithms have limitatio
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Chapter 3 simulated star source is
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Chapter 4 Figure 4-1. Overview of t
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Chapter 4 enclosures, and stable la
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Chapter 4 facilities from which dat
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Chapter 4 Figure 4-5. Microslip Tri
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Chapter 4 Figure 4-7. Calibration o
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Chapter 4 Figure 4-8. Comparison of
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Chapter 4 4.2 Subsystem and System
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Page 112 and 113: Chapter 6 super computers and is us
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Page 126 and 127: Chapter 7 7.4.4 Wavefront Sensing a
Page 128 and 129: Chapter 7 7.4.6 Transmissive Optics
Page 130 and 131: Chapter 7 7.4.8 Scatterometer Scope
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Page 148 and 149: Appendices Appendix B: TPF-C Detail
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Page 152 and 153: Appendices Appendix F: Acronym List
Page 154: Appendices RWA SAO SBIR SIM SM SMFA
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TPF-C Technology Plan - Exoplanet Exploration Program - NASA

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