Heat-Activated Elastic Memory Composite Occulter for Exoplanet Detection
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Solution Overview
Problem
The direct detection of extrasolar planets is hindered by the overwhelming brightness of their host stars, as existing occulter designs are too large to be launched into space and suffer from diffraction issues that allow starlight to still be visible around the occulter's edges.
Innovation Solution
A deployable structure using elastic memory composite materials that can change configuration from a compact to an extended shape via heat activation, featuring a heat shield assembly to protect and deploy the structure in space, and specially shaped petals to eliminate constructive diffraction interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large occulter disc is used to block starlight, then the ability to observe planets is improved, but the structure becomes too large to be launched into space
Solution Approach 1:
The occulter structure is designed to be nested or folded into a compact configuration that fits within launch vehicle constraints, then deployed to its full operational size in space. The petal-like structures can be folded against each other during launch and unfurled to form the complete occulter disc at the destination.
Solution Approach 2:
The occulter employs deployable, movable structures rather than rigid fixed components. The petal structures can be dynamically positioned and adjusted after deployment, allowing the system to transition from a compact launch configuration to the extended operational configuration needed for effective starlight blocking.
2Ease of manufacture
If a simple circular occulter disc is used, then the structure is easy to manufacture, but diffraction causes starlight to remain visible around the edges
Solution Approach 1:
The occulter incorporates asymmetric petal-like structures around its perimeter rather than a simple circular edge. These asymmetric features are specifically shaped to manipulate the diffraction pattern of light, causing destructive interference that suppresses starlight in the observation region while maintaining relative manufacturing simplicity.
Solution Approach 2:
The occulter has different structural properties at different locations: the central disc area provides bulk blocking, while the perimeter features specialized petal structures with specific geometric properties designed to control diffraction. This local differentiation addresses the diffraction problem without requiring complete redesign of the entire structure.
3Reliability
If the occulter structure is deployed to full size in space, then starlight blocking is effective, but the structure requires complex deployment mechanisms and thermal protection during launch
Solution Approach 1:
The occulter structures are pre-configured in a compact, protected state for launch, with deployment mechanisms prepared but not activated. Thermal protection systems are pre-positioned on the structure before launch, and the deployment sequence is predetermined, reducing the need for complex real-time control systems during the deployment phase.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the blocking of starlight while allowing planet light to be observed, overcoming size constraints and diffraction challenges, allowing for the direct detection of exoplanets by deploying a compact, heat-activated occulter in space.
Implementation Method 1
at least one structural element formed from an elastic memory composite material; heating up at least one structural element beyond a change state temperature thereof; changing the configuration of the structural element from an extended configuration to a reduced size configuration; heating, via the heat radiation, at least a portion of the structural element to thereby cause the structural element to change from the reduced size configuration to the extended configuration
Implementation Method 2
covering the structural element with a thermal protection device; removing the thermal protection device to expose the structural element to heat radiation
Implementation Method 3
light incoming from the target star would diffract around the disc and constructively interfere along the central axis; By adding specially shaped petals to the outer edge of the disc, the starlight will disappear, allowing the suppression of the star's light
Data Source
AI summary
An embodiment of the present method may comprise: heating up at least one structural element beyond a change state temperature thereof; changing the configuration of the structural element from an extended configuration to a reduced size configuration; cooling the structural element to below the change state temperature thereof; covering the structural element with a thermal protection device; removing the thermal protection device to expose the structural element to heat radiation; and heating, via the heat radiation, at least a portion of the structural element to thereby cause the structural element to change from the reduced size configuration to the extended configuration. In one embodiment each of the structural elements is formed from a thin elastic memory composite material.