Toroidal Mirror Spectrometer Spatial Separation
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Solution Overview
Problem
Spectral interference occurs in optical emission spectroscopy due to overlapping spectral lines from different elements, making it difficult to extract accurate elemental composition data, and existing spectrometers face challenges in efficiently illuminating multiple gratings and reducing high excitation energy background noise.
Innovation Solution
A compact spectrometer design utilizing a single toroidal mirror to spatially separate light from different regions of the spark source, allowing each grating to be preferentially illuminated, thereby reducing spectral interference and improving light collection efficiency, and employing a single entrance slit with multiple diffraction gratings for broad spectral range coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate gratings with separate entrance slits are used to cover broad spectral range, then spectral coverage is improved, but device complexity and size increase
Solution Approach 1:
A single detector array performs multiple functions by detecting spectra from multiple gratings simultaneously. The detector is positioned to receive diffracted light from several gratings, each covering different spectral ranges, allowing one detector to replace what would traditionally require multiple separate detection systems.
Solution Approach 2:
Multiple spectral ranges that would traditionally require separate optical paths are merged into a single detection plane. The optical design combines light from multiple gratings onto a single detector array, reducing the number of separate optical systems needed while maintaining broad spectral coverage.
2Measurement precision
If spectral lines from different elements overlap, then measurement precision deteriorates, but this is a fundamental challenge in OES
Solution Approach 1:
The spectral range is segmented across multiple gratings, with each grating optimized for specific wavelength regions. This segmentation allows better separation of overlapping spectral lines by distributing different portions of the spectrum across multiple optical paths that are then detected simultaneously, reducing interference between lines from different elements.
3Volume of moving object
If a compact spectrometer design is used, then device size is reduced, but illuminating multiple gratings efficiently becomes difficult
Solution Approach 1:
The optical design utilizes three-dimensional spatial arrangement to direct light from a single entrance slit to multiple gratings positioned at different locations and orientations. By exploiting the third dimension, the system achieves efficient illumination of multiple gratings in a compact configuration without requiring multiple separate light sources or complex optical paths.
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
The design effectively reduces spectral interference and enhances light collection efficiency, enabling more accurate elemental analysis by spatially separating spectral information and maintaining high resolving power across a broad spectral range.
Implementation Method 1
A compact spectrometer design utilizing a single toroidal mirror to spatially separate light from different regions of the spark source
Implementation Method 2
an optical system for dispersing the emitted light into discrete wavelengths
Data Source
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Figure 7
AI summary
A spark optical emission spectrometer comprising: a spark source for causing spark induced emission of light from a sample; a single entrance slit; a toroidal mirror for directing the light through the single entrance slit; a plurality of diffraction gratings for diffracting light that has been directed through the entrance slit by the mirror, whereby the plurality of diffraction gratings are simultaneously illuminated; and at least one array detector for detecting the diffracted light from the plurality of diffraction gratings, wherein the mirror is for directing the light through the entrance slit such that light from different regions in the spark source is spatially separated in an image of the light at the gratings whereby a first diffraction grating is preferentially illuminated with light from a first region of the spark source and simultaneously a second diffraction grating is preferentially illuminated with light from a second region of the spark source.