Spectrometer Aperture Geometry Optimization for Aberration Control
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Solution Overview
Problem
Conventional aperture geometries in spectrometers are often unsuitable for the beam path, limiting the realization of advantages related to aberrations and other factors, thus hindering optimal performance.
Innovation Solution
An adaptive method for determining the aperture geometry of an aperture diaphragm using an optical model with free parameters and a quality function to optimize the beam path, allowing for the selection of the best aperture geometry based on specified quality criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional aperture geometries (circular, elliptical, rectangular) are used, then manufacturing is simple and standard, but the aperture geometry is unsuitable for the beam path within the spectrometer, limiting the realization of advantages regarding aberrations and other factors
Solution Approach 1:
The invention changes the geometric parameters of the aperture from conventional fixed shapes (circular, elliptical, rectangular) to a customized geometry defined by up to 12 adjustable parameters. These parameters control the shape, size, and orientation of the aperture opening, allowing optimization for specific beam paths while maintaining manufacturability through systematic parameter control.
Solution Approach 2:
The aperture geometry is optimized locally for each specific beam path configuration within the spectrometer. Instead of using a universal standard shape, the invention tailors the aperture's local geometric properties (edge angles, curvature, positioning) to match the specific requirements of the beam path, thereby reducing aberrations and improving optical performance.
2Ease of operation
If an aperture diaphragm is positioned before the entrance slit where light beams have not yet been spectrally split, then the aperture can define the beam geometry, but common aperture geometries are often unsuitable for the beam path within the spectrometer
Solution Approach 1:
The aperture diaphragm is positioned and configured before the entrance slit to pre-define the beam geometry before spectral splitting occurs. The customized aperture shape prepares the beam for subsequent optical components by establishing optimal geometric parameters in advance, ensuring that the beam is properly conditioned for the spectrometer's optical path.
Solution Approach 2:
The aperture geometry parameters can be dynamically adjusted to match different beam path configurations. The system allows for adaptive optimization where the aperture parameters are modified based on the specific operational requirements, enabling the aperture to maintain optimal performance across different measurement conditions.
3Manufacturing precision
If the aperture diaphragm together with the focal length determines the system's aperture ratio, then the aperture influences aberrations, but selecting the aperture diaphragm and its geometry requires complex optimization to fully realize advantages
Solution Approach 1:
The aperture optimization problem is segmented into discrete adjustable parameters (up to 12 parameters controlling shape, size, and orientation). This segmentation allows the complex optimization to be broken down into manageable parameter adjustments, making the optimization process more systematic and less overwhelming while achieving precise aberration control.
Data Source
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AI summary
The invention relates to a method for adapting the aperture geometry of an aperture (1) of an aperture diaphragm (2) to a beam path (3) of light beams in a spectrometer (4), wherein the spectrometer (4) comprises the aperture diaphragm (2), several optical components (5) and a detector (6), and wherein the method comprises at least the following steps: - specifying an optical model that describes the beam path (3) and includes the optical components (5) as well as their position and orientation, wherein the optical model has a first free parameter set that describes the aperture geometry and comprises two or more first free parameters, - establishing a quality function that includes at least one quality criterion of the beam path (3), wherein the quality function is configured to calculate a quality measure based on the optical model.- Substituting a multitude of sets of values for the first free parameter set and calculating the goodness-of-fit measure for each set of values, - Determining the aperture geometry by selecting the set of values from the first free parameter set for which the lowest goodness-of-fit measure was calculated.