Correction Optics for Spectrometer Slit Curvature
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Solution Overview
Problem
Existing spectrometers face challenges in correcting undesired curvature in the projection of a straight entry slit, leading to distorted images and difficulties in spectral component reconstruction, which can diminish the effective use of detector arrays.
Innovation Solution
The introduction of correction optics, comprising a cylindrical mirror plane, a collimation compensator, a flat mirror plane, and an exit surface, formed as a monolithic block, which warps the straight object line shape into a curved shape to counteract the distorting curvature caused by projection optics, resulting in a spectrally resolved image with parallel straight projected line shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If projection optics are used to project spectrally resolved image onto detector array, then spectral analysis capability is improved, but curvature distortion in the projected slit line shape occurs
Solution Approach 1:
The correction optics are positioned in the optical path before the projection optics to pre-correct the curvature distortion. By applying the opposite curvature transformation in advance, the distortion is counteracted before the projection occurs, resulting in a straight projected slit line shape on the detector array while maintaining spectral resolution capability
Solution Approach 2:
Correction optics serve as an intermediary component between the entry slit and the projection optics. This intermediate optical element transforms the curved object line shape into a shape that, when projected, produces a straight line image, thereby mediating the distortion issue while preserving the spectral analysis function
2Shape
If correction optics are added to counteract curvature distortion, then image shape accuracy is improved, but device complexity increases
Solution Approach 1:
The correction optics are integrated into the existing spectrometer optical path as a unified component. By merging the correction function with the existing optical system rather than adding separate complex subsystems, the solution improves image shape accuracy while minimizing the increase in overall device complexity
Solution Approach 2:
The correction optics perform multiple functions within a single component: they correct curvature distortion, maintain spectral resolution, and work兼容 with existing projection optics. This multi-functionality reduces the need for additional specialized components, thereby limiting the increase in device complexity
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
This solution effectively corrects the curvature, allowing for improved image reconstruction and enhanced utilization of detector arrays by transforming the distorted image into a straight, parallel format, thereby simplifying spectral analysis.
Implementation Method 1
an internal reflection surface forming a cylindrical mirror plane
Implementation Method 2
a curved entry surface forming a collimation compensator configured to counteract decollimation of parallel principal light rays after reflection by the cylindrical mirror plane, wherein the collimation compensator comprises a cylindrical optical surface
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 2C~2D
AI summary
Correction optics (10) are disposed in an optical path directly behind an entry slit (1) of a spectrometer (100) and configured to warp a straight object line shape (A1) of the entry slit (1) into a curved object line shape (B1) from a point of view of the projection optics (2,3,4). The warping of the correction optics (10) is configured such that a curvature (R1) of the curved object line shape (B1) counteracts an otherwise distorting curvature (R5) in a projection (A5) of the straight object line shape (A1) by the projection optics (2,3,4) without the correction optics (10). As a result, the spectrally resolved image (B5) comprises a plurality of parallel straight projected line shapes formed by spectrally resolved projections of the straight object line shape (A1).