Spectral Polar Imager Beam Displacer Lenslet Array
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Solution Overview
Problem
Current Space Situational Awareness (SSA) technologies are limited in characterizing distant and dim unresolved objects, relying mainly on light curve analysis, which lacks efficient utilization of spectral and polar information, and struggles with temporal resolution and signal efficiency.
Innovation Solution
The development of spectral, polar, and spectral-polar imagers that use a coupling optic to form displaced images across an array of lenslets, achieving high photon collection efficiency and scalable snapshot-mode spectral imagery by combining spectral and polar beam displacement techniques, with a collimator, beam displacer, and lenslet array to minimize chromatic blur and crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If integration time is increased to increase signal of dim objects, then signal strength is improved, but temporal resolution deteriorates
Solution Approach 1:
The patent segments the spectral information by using an array of lenslets, each forming an image in a unique spectral band. This allows simultaneous capture of multiple spectral bands in a single exposure, effectively providing multi-spectral imaging without increasing integration time, thus maintaining temporal resolution while enhancing signal extraction capability.
Solution Approach 2:
The patent transitions from temporal dimension (increasing integration time) to spectral dimension (using multiple lenslets for different spectral bands). By dispersing light spectrally and capturing multiple bands simultaneously, the system achieves enhanced signal extraction without sacrificing temporal resolution, effectively moving the problem solution from time domain to spectral domain.
2Loss of information
If traditional light curve analysis is used for unresolved objects, then temporal signature variations are captured, but spectral and polar information remain unexploited
Solution Approach 1:
The patent creates a multi-functional imaging system where a single instrument simultaneously captures temporal, spectral, and polar information. The lenslet array configuration enables the system to perform traditional light curve analysis while also extracting spectral signatures and polarization data, making the system universal for multiple types of astronomical observations without requiring separate instruments.
Solution Approach 2:
The patent introduces a beam displacer as an intermediary optical element that separates polarized light components. This intermediary device enables the system to capture polarization information without fundamentally redesigning the entire imaging system, allowing traditional imaging paths to coexist with polarimetry capabilities through the mediating action of the beam displacer.
3Loss of information
If snapshot-mode spectral imagery is achieved with multiple spectral bands, then spectral information extraction is improved, but photon collection efficiency may be reduced
Solution Approach 1:
The patent optimizes the optical parameters of the lenslet array system, including focal lengths, aperture sizes, and spacing, to maximize photon collection efficiency while maintaining snapshot-mode spectral imaging capability. By carefully tuning these parameters, the system achieves high efficiency in directing photons to the detector across multiple spectral bands simultaneously.
Solution Approach 2:
The patent assigns different spectral bands to different lenslets in the array, allowing each lenslet to be optimized for its specific wavelength range. This local optimization enables each element to maximize photon collection for its designated band while the overall system achieves comprehensive spectral coverage, balancing spectral information extraction with energy efficiency.
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 efficient extraction of spectral and polar information from distant, dim unresolved objects, enhancing SSA capabilities with high photon collection efficiency and improved temporal sampling, reducing chromatic blur and crosstalk, and allowing for simultaneous sampling of multiple spectral bands.
Implementation Method 1
a coupling optic is employed to form a displaced image of the pupil across an array of lenslets. Each of the lenslets forms an image in a unique spectral band
Implementation Method 2
using a birefringent material to displace the beam (s) based on polarization instead of wavelength
Implementation Method 3
Each of the lenslets forms an image in a unique spectral band
Data Source
AI summary
An imager for imaging a plurality of images of a single scene over a plurality of disparate electromagnetic wavelength sets includes front-end optics for outputting a polychromatic, collimated image beam of the scene; a beam displacer configured for splitting the collimated image beam into spatially displaced, mutually parallel beams, and an imaging-sensor array configured for registration of the spatially displaced wavelength sets at disparate locations along the imaging-sensor array. In alternative versions, the beam displacer displaces constituent light beams based on at least one of wavelength and polarization. In various implementations, a back-end focusing element focuses each constituent beam onto a predetermined location along the imaging-sensor array. The imaging-sensor array is optimally configured for simultaneous sampling of the plural images focused thereupon by the back-end focusing elements.