Cornerstone Research Conformal Membrane Reflectors for Deployable Optics.pdf

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Cholesteric
Discotic
Transmitted Light:
Wavelength Selection
3.0 2.5 Optical Density
100 90 % cholesteric agent (weight %) 80 70 60 50 40 30 20 10
(single polarization)
Specular Reflection in Monodomain Broadband Device Specular Reflection in Monodomain Broadband Device (XLCP film on 2.5 cm diameter glass substrate) (XLCP film on 2.5 cm diameter glass substrate)
0 200
300
400
500
600
700
800
λ, nm
Task 1-1: Monodomain Broadband Film
2.0 1.6 Optical Density
(for single polarization)
Optical Density Optical Density (single polarization) (single polarization)
Requirement: Large Membrane Optics
Key Technology: Key Technology: All-Polymer Broadband Reflector All-Polymer Broadband Reflector
• • • • • • Thermal Stability Low Areal Density High Specular Reflectivity Broad Bandwidth Radiation Hard Mechanically Robust
UR041298 XLCP
1.2
0.8
0.4
0.0 400
500
600
700
800
900
01.30.02
Wavelength (nm)
CRGSRV1/Technical Data/NASA Gossamer (1115)/UR Samples/UR041298 Transmission and OD (012902).xls
3.0
Optical Density
2.0
0 400
500
600
700
800
900
1000
Wavelength (nm)
1.0
Experimental Performance Experimental Performance Correlates Well with Theory Correlates Well with Theory
1-1 Demo Monodomain Broadband Reflective Film
Task 1-1: Monodomain Broadband Film
• University of Rochester effort -- Prof Shaw Chen • Developed monodomain LCP broadband reflective film – Cross-linked cholesteric LCP • Formulated with commercially available monomers • Polymerization yields graded pitch of molecular structure -- broadening the reflection band – Homogenous film with good alignment – Transitioned fabrication process technology to CRG • Achieved broadband specular reflectance Reflectance near theoretical maximum of 50% for single layer material
wavelength selection guide % cholesteric agent in mixture
2.0 1.5 1.0 0.5 0.0 400
450
500
550 Wavelength (nm)
600
650
700
0 300
400
500
600
700
800
900
1000
Wavelength (nm)
50
Task 1-1: Monodomain Broadband Film
Specular, +dp/dz Specular, -dp/dz
40
30
%R
20
10
Reflection Spectrum Reflection Spectrum (XLCP, 14 microns thick) (XLCP, 14 microns thick)
Phase II Phase
Prototype Mirror Prototype Mirror LCP Membrane, Monodomain Broadband Reflector: Coupon
Phase II Phase II
LCP Membrane, Monodomain Broadband Reflector: 1 m Prototype Mirror
Conformal Membrane Reflectors for Deployable Optics
Patrick J. Hood Cornerstone Research Group, Inc. Dayton, OH 45440 937.320.1877 23 May 2002
Overview
Inorganic Resins Inorganic Resins
Company History
Smart Materials (1999-present)
Shape Memory Shape Memory Polymers Polymers
Dynamic Modulus Dynamic Modulus Composites Composites
500 600 700 800
0.0 400
Wavelength, nm
Conformal Processing
3.0 2.5 Optical Density 2.0 1.5 1.0 0.5 0.0 400
XLCP Membrane Conformed XLCP Membrane Conformed to Parabolic Figure: to Parabolic Figure: Wrinkle-Free Surface Wrinkle-Free Surface Retained Optical Performance Retained Optical Performance
Phase I Work Plan
0 = 19 Oct 2001 WEEKS AFTER AWARD 10/22 4 11/19 8 12/17 12 1/14 16 2/11 20 3/11 TASK 1-1A UR Formulate & Fabricate Film 1-1B UR Transition Process Technology to CRG 1-1C Assess Technology for Ph II Planning 1-2 Demo 10 cm Monodomain Narrowband Reflective Membrane 1-2A Formulate Material 1-2B Develop Fabrication Process 1-2C Assess Technology for Ph II Planning 1-3 Characterize Films & Membranes 1-3A Characterize UR Films 1-3B Charcterize CRG Membranes 1-4 Determine Radiation Effects on Membranes 1-4A Compare Pre- & Post-Irradiation Charact'n 1-4B Assess Required Formulation Changes 24
Reflective Membranes Reflective Membranes
Company History
Structural Materials (1998-present)
Syntactics Syntactics Reactive Liquid Reactive Liquid Crystals Crystals
Company History
Optical Materials (1997-present)
Latching Electrooptic Latching Electrooptic Liquid Crystals Liquid Crystals Composite Mirrors Composite Mirrors
• Company Introduction • Program Outline • Results • Related CRG Technology • Summary
Mission
Company History
• Founded April 1997 to conduct applied R&D of novel polymeric materials • Bootstrapped: No partners or outside investors • First commercial contract awarded February 2001 (35% of sales)