Multi-mode Imaging Spectrometer with Orthogonal Slits
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Solution Overview
Problem
Conventional imaging spectroscopy systems face challenges in achieving both wide area coverage and fine spectral resolution with a single set of spectrometer optics due to size, weight, power, and cost constraints, often requiring multiple spectrometers optimized for different modes of operation.
Innovation Solution
A multi-mode imaging spectrometer is designed with two orthogonal entrance slits and a single set of optics, allowing configuration between wide area, moderate spectral resolution and narrow area, fine spectral resolution modes, using a grating or prism as the dispersive element and a processor to switch between modes based on image data analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple single-mode spectrometers are used to achieve both wide area coverage and fine spectral resolution, then both requirements are met, but device complexity and SWAP-C constraints are worsened
Solution Approach 1:
A single imaging spectrometer is designed to perform multiple functions by switching between two operational modes: wide area coverage mode and fine spectral resolution mode. The system uses two entrance slits with orthogonal orientations that can be selectively activated, allowing one spectrometer to replace what would traditionally require two separate spectrometers, thereby reducing device complexity while maintaining adaptability
Solution Approach 2:
The spectrometer incorporates dynamic reconfiguration capability through movable components including a fold mirror and selectable entrance slits. The system can dynamically switch between different operational modes by changing the optical path configuration, enabling adaptation to different measurement requirements without physical reconfiguration or multiple fixed instruments
2Area of stationary object
If spectrometer optics are optimized for wide area coverage, then area coverage is improved, but spectral resolution deteriorates
Solution Approach 1:
The optical system is designed with dynamic reconfiguration capability that allows switching between two operational modes. In wide area mode, the first entrance slit is used with optical paths optimized for broad coverage. In fine spectral resolution mode, the second entrance slit is activated with different optical path configurations. This dynamic switching enables the same optics to achieve both wide area coverage and fine spectral resolution at different times, resolving the trade-off between these two parameters
3Measurement precision
If spectrometer optics are optimized for fine spectral resolution, then spectral resolution is improved, but area coverage deteriorates
Solution Approach 1:
The single imaging spectrometer is designed to universally handle both wide area coverage tasks and fine spectral resolution analysis tasks. By incorporating two entrance slits with orthogonal orientations and the capability to selectively activate different optical paths, the system provides universal functionality that eliminates the need for separate specialized instruments, allowing the same optics to serve both purposes depending on operational mode
4Device complexity
If a single set of spectrometer optics is used for both wide area coverage and fine spectral resolution, then SWAP-C is reduced, but the ability to achieve both modes with same optics deteriorates
Solution Approach 1:
The spectrometer incorporates dynamic reconfiguration mechanisms including movable fold mirrors and selectable entrance slits that enable the single optical system to adapt between wide area coverage mode and fine spectral resolution mode. This dynamic capability ensures that despite using a single set of optics, the system maintains full adaptability to different operational requirements, resolving the contradiction between SWAP-C reduction and mode configurability
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 detection and identification of materials with reduced SWAP-C by dynamically switching between modes, providing wide area coverage with moderate spectral resolution and fine spectral resolution over a smaller area using the same optical prescription.
Implementation Method 1
at least one dispersive element configured to spectrally disperse electromagnetic radiation and provide spectrally dispersed electromagnetic radiation
Implementation Method 2
collimating and imaging optics configured to receive the electromagnetic radiation from the first entrance slit during a first mode of operation of the imaging spectrometer and from the second entrance slit during a second mode of operation of the imaging spectrometer, and to direct the electromagnetic radiation to the at least one dispersive element, at least one imaging detector configured to receive the spectrally dispersed electromagnetic radiation and produce image data therefrom, the collimating and imaging optics being further configured to direct and focus the spectrally dispersed electromagnetic radiation onto the at least one imaging detector
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3F
AI summary
A multi-mode imaging spectrometer that incorporates two orthogonally positioned entrance slits and is configurable between a first mode in which the system produces images of relatively wide spatial coverage with moderate spectral resolution, using a first one of the two slits, and a second mode in which the system produces images of a smaller spatial area with fine spectral resolution, using the other one of the two slits.