TPF-C Technology Plan - Exoplanet Exploration Program - NASA

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Chapter 7 7.4.6 Transmissive Optics Scope If it is decided that a configuration similar to that of the minimum design mission is needed, the following technology development steps can be outlined further in Phase A and pursued. The schedule for transmissive optics work is given in Table 7-7. First the system requirements would be defined through detailed modeling of the system using values for the state of the art and allowing for error correction via DMs. A detailed design including material identification would be performed and investigated with vendors for manufacturability. Demonstration optics would be procured and tested at the manufacturers, for example from Corning for fused silica and from Schott for the beamsplitter glass. Measurements if selected, specially prepared blanks would include dispersion of optical constants, birefringence, striations, bubbles and inclusions, through-thickness homogeneity of index, surface and internal scatter over wavelength; this is estimated to be a ~1-year-long process. The properties of the optical cement and the cemented assembly must also be addressed at the same time, through modeling and measurement, specifically with respect to induced stress. The alternative approach of large-scale wire grid polarizers fabricated through electron beam lithography might also be addressed. State of the Art TRL 2 With samples of fused silica, homogeneity values in the range of 0.5 ppm have been published, birefringence levels as low as 0.07 nm/cm have been obtained, and scatter (transmission loss) at a level just over 10 -5 /cm has been reported Table 7-7. Transmissive Optics Schedule Planned Completion Date Planned Activities Performance Targets TRL Phase A Large blanks of transmissive optics glass completed Characterization data from large blanks delivered Blanks of a size consistent with 10-cm clear aperture optics Blanks meet or exceed performance requirements as outlined in the contracts as consistent with the error budget 3 4-5 116
Plan for Technology Development 7.4.7 Coatings Scope In order to achieve TRL 6 at the end of Phase B, we will progress through a series of steps from identification of suitable designs and confirmation of their performance on small parts (“witness samples”), to developing the processes for coating on large scales (for the primary and secondary mirrors) and confirmation of performance using the TDM as a large test system. In addition, test coatings for all optics throughout TPF-C and confirmation of their properties on witness samples will be demonstrated to ensure their performance conforms to the established requirements. The coatings have achieved TRL 3.The schedule for coatings work is given in Table 7-8. Table 7-8. Coatings Schedule Planned Completion Date Planned Activities Performance Targets TRL Pre-Phase A Design of critical coatings Sensitivity analysis of coating performance Measurement of small samples confirm design performance Initiate lifetime measurements Input to definition of TDM coating requirements & process Nominal designs for all optics completed Small samples of critical coatings meet required performance 1-3 Phase A Define tests to be used on large optics to confirm performance Test coatings for TDM Test sample coatings for all components to confirm performance TDM coating performance meets or exceeds requirements Samples of all critical coatings meet or exceed performance requirements 4-6 117
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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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Page 80 and 81: Chapter 4 4.2 Subsystem and System
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Page 84 and 85: Chapter 4 Figure 4-12. Fine guiding
Page 86 and 87: Chapter 4 (5) The Fine Steering Mir
Page 88 and 89: Chapter 4 Third, precise thermal co
Page 90 and 91: Chapter 4 giving confidence that fl
Page 92 and 93: Chapter 4 surface polish is nonethe
Page 94 and 95: Chapter 5 TPF-C is planning a suite
Page 96 and 97: Chapter 5 engineering judgment (i.e
Page 98 and 99: Chapter 5 categories, in reality ea
Page 100 and 101: Chapter 5 Table 5-3. Validation of
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Page 106 and 107: Chapter 6 6 Instrument Technology a
Page 108 and 109: Chapter 6 Figure 6-1. Detailed conc
Page 110 and 111: Chapter 6 The first method is self-
Page 112 and 113: Chapter 6 super computers and is us
Page 114 and 115: Chapter 7 7 Plan for Technology Dev
Page 116 and 117: Chapter 7 Figure 7-1. TPF-C Technol
Page 118 and 119: Chapter 7 Improvements to the DM ov
Page 120 and 121: Chapter 7 7.3 Error Budgets 7.3.1 D
Page 122 and 123: Chapter 7 7.4 Optics and Starlight
Page 124 and 125: Chapter 7 7.4.2 Apodizing Masks and
Page 126 and 127: Chapter 7 7.4.4 Wavefront Sensing a
Page 130 and 131: Chapter 7 7.4.8 Scatterometer Scope
Page 132 and 133: Chapter 7 7.5 Structural, Thermal,
Page 134 and 135: Chapter 7 7.5.3 Precision Structura
Page 136 and 137: Chapter 7 model of TPF-C and should
Page 138 and 139: Chapter 7 7.5.6 Secondary Mirror To
Page 140 and 141: Chapter 7 7.5.8 Sub-scale EM Sunshi
Page 142 and 143: Chapter 7 7.6 Integrated Modeling a
Page 144 and 145: Chapter 7 7.7.3 Advanced Concepts:
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Page 148 and 149: Appendices Appendix B: TPF-C Detail
Page 150 and 151: Appendices Appendix D: TPF-C Techno
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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