Spectrometer Aberration Reduction via 3D Detection Unit Placement
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Solution Overview
Problem
Conventional spectroscopy apparatuses suffer from aberrations such as spherical, coma, and astigmatism in the post-diffraction radiation light, which degrade the color-specific resolution and energy intensity, making it difficult to analyze materials effectively.
Innovation Solution
A spectrometer configuration where a slit unit, collimating member, diffraction grating, and focusing member are arranged in one plane, with the detection unit located under or above the diffraction grating, optimizing the focal lengths and positions to minimize aberrations and maximize the intensity of post-diffraction radiation light received by the photoelectric device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the detection unit is arranged in the conventional planar configuration with the diffraction grating and light concentration member, then the device complexity is reduced, but spherical aberration, coma aberration, and astigmatism occur in the post-diffraction radiation light
Solution Approach 1:
The detection unit is moved from the conventional planar arrangement to a three-dimensional position above or below the diffraction grating. This dimensional change allows the detection unit to be positioned at the focal point of the focusing member, enabling proper focusing of post-diffraction radiation light while eliminating aberrations caused by planar arrangement constraints.
2Illumination intensity
If the light concentration member is used to focus post-diffraction radiation light, then the energy intensity is improved, but spherical aberration and coma aberration degrade the color-specific resolution
Solution Approach 1:
The light concentration member is removed from the optical path. Instead, a focusing member is used to focus the post-diffraction radiation light directly onto the detection unit. This extraction of the light concentration member eliminates the aberrations it introduced while maintaining the energy focusing function through the alternative focusing member.
Solution Approach 2:
The focusing member acts as an intermediary between the diffraction grating and the detection unit. It properly focuses the post-diffraction radiation light onto the detection unit's focal point, enabling both high energy intensity and high color-specific resolution without the aberrations caused by conventional light concentration members.
3Device complexity
If the diffraction grating is arranged diagonally to the optical axis, then the device complexity is reduced, but coma aberration and astigmatism occur in the post-diffraction radiation light
Solution Approach 1:
The detection unit is positioned in a third dimension (above or below the diffraction grating) rather than being constrained to the planar arrangement. This allows the diffraction grating to be optimally positioned and oriented, with the focusing member capturing the post-diffraction radiation light at the focal point, thereby eliminating coma and astigmatism aberrations.
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 configuration enhances the energy intensity and reduces aberrations, allowing for improved material analysis by ensuring each pixel receives focused light within the maximum opening width, thereby increasing the color-specific resolution and energy intensity of the post-diffraction radiation light.
Implementation Method 1
the pre-diffraction radiation light L1 or L3 is diffracted into multiple wavelengths through the diffraction grating 14, whereby post-diffraction radiation light L2 or L4 is formed
Implementation Method 2
a slit unit and a collimating member sequentially arranged along a path of the pre-diffraction radiation light
Implementation Method 3
a focusing member and a detection unit sequentially arranged along a path of the post-diffraction radiation light
Implementation Method 4
focused on a photoelectric device of the detector 40, such as a photodiode array, a charge coupled device (CCD), or an image sensor 36
Data Source
AI summary
Disclosed is a spectrometer including a slit unit and a collimating member sequentially arranged along a path of pre-diffraction radiation light, a focusing member and a detection unit sequentially arranged along a path of post-diffraction radiation light, and the diffraction grating located between the collimating member and the focusing member, wherein the slit unit, the collimating member, the diffraction grating, and the focusing member are seated in one plane and are spaced apart from each other by a predetermined distance, and the detection unit is spaced apart from one plane and is located under or above the diffraction grating.