Multispectral Optics Using Composite Materials for Compact Imaging
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Solution Overview
Problem
Current multispectral imaging systems using refractive optics are bulky and heavy due to the limited availability of optical materials that can cover the transmission range from Shortwave Infrared (SWIR) to Longwave Infrared (LWIR), requiring numerous optical elements for chromatic aberration correction, which increases size, weight, and alignment challenges, and results in reduced image brightness and performance.
Innovation Solution
A compact multispectral imaging system using new refractive optical materials, such as MILTRAN ceramics and NRL glasses, which transmit across SWIR, MWIR, and LWIR bands, reducing the number of optical elements and air/glass interfaces, thereby minimizing size, weight, and Fresnel reflection losses, while allowing for easier athermalization and improved optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional refractive optics with limited optical materials are used to cover SWIR to LWIR bands, then chromatic aberration correction is achieved, but the number of optical elements increases, leading to increased size and weight
Solution Approach 1:
The patent employs composite optical materials including chalcogenide glasses, crystalline materials, and polymer-based materials with tailored optical properties. These composite material systems enable broad spectral coverage from SWIR to LWIR while reducing the number of discrete optical elements needed, thereby decreasing overall system weight while maintaining chromatic aberration correction capability
Solution Approach 2:
The invention develops optical elements with universal functionality that can operate across multiple spectral bands (SWIR, MWIR, LWIR) simultaneously. By designing optical materials and structures that serve multiple spectral functions, the system reduces the total number of elements required, directly addressing the weight reduction goal while preserving correction performance
2Adaptability or versatility
If numerous optical elements are used to cover broad spectral range, then spectral coverage is improved, but device complexity and alignment challenges increase
Solution Approach 1:
The patent utilizes composite optical materials such as chalcogenide glass compositions (e.g., Ge-As-S, Ge-As-Se systems) and crystalline materials that inherently provide broad spectral transmission from SWIR through LWIR. This material-level solution achieves spectral versatility without requiring multiple discrete optical elements, thereby reducing device complexity
Solution Approach 2:
The invention merges multiple spectral band capabilities into unified optical elements and a single shared aperture system. By combining SWIR, MWIR, and LWIR functionality into integrated optical structures with common focal planes, the design reduces the number of separate components and simplifies the overall system architecture
3Measurement precision
If multiple optical elements with air/glass interfaces are used, then chromatic aberration is corrected, but Fresnel reflection losses increase, reducing image brightness
Solution Approach 1:
The patent employs composite material systems including chalcogenide glasses and crystalline materials that can be engineered with optimized refractive indices. By selecting and combining materials with appropriate optical properties, the design minimizes Fresnel reflection losses at interfaces while maintaining the chromatic aberration correction function, thereby preserving image brightness
Solution Approach 2:
The invention optimizes optical design parameters including refractive index selection, surface curvature, and layer thickness of anti-reflective coatings. By carefully adjusting these parameters, the system reduces Fresnel reflections at air/optic interfaces while maintaining effective chromatic aberration correction across the broad spectral range
4Measurement precision
If many optical elements are assembled, then optical performance is achieved, but alignment tolerances become more difficult to meet
Solution Approach 1:
The patent merges multiple optical functions into fewer integrated elements and employs a common aperture design with shared focal planes. This consolidation reduces the number of interfaces and assembly steps, thereby relaxing alignment tolerance requirements while maintaining diffraction-limited optical performance across all spectral bands
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
The new materials enable a compact, lightweight multispectral imager with improved performance, reduced cost, and simplified alignment tolerances, as they fill gaps in the glass map, providing more options for multispectral optics and enhancing imaging capabilities across challenging spectral bands.
Implementation Method 1
refractive optical elements capable of simultaneously focusing light from one or more spectral bands (SWIR, MWIR, and LWIR) to a common focal plane
Implementation Method 2
optical materials chosen from a set of new multispectral optical materials... that transmit in multispectral wavelength regions
Data Source
AI summary
A compact multispectral imaging system comprising a set of optical elements capable of simultaneously focusing light from one or more spectral bands (SWIR, MWIR, and LWIR) to a common focal plane and a detector capable of capturing the multispectral image, wherein the optical elements comprise optics made from new optical materials or in combination with existing optical materials that transmit in multispectral wavelength regions.