Multichannel Spectrograph with Integrated Grating and Shared Mirror
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Solution Overview
Problem
Traditional grating monochromators require mechanical rotation and frequent grating replacements to achieve high wavelength resolution and efficiency across a wide wavelength range, necessitating multiple photodetectors and complex mechanical structures, which complicates multi-spectrum channel measurement and analysis.
Innovation Solution
A multichannel broadband high-resolution spectrograph design featuring a multichannel integrated grating with sub-gratings, a shared two-dimensional focus imaging mirror, and a two-dimensional area array detector, eliminating mechanical transmission mechanisms and allowing simultaneous measurement of multiple channels with full-spectrum, high-resolution imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional grating monochromator uses mechanical rotation to scan wavelengths, then wavelength scanning capability is achieved, but device complexity increases due to mechanical transmission mechanisms
Solution Approach 1:
The patent replaces the mechanical rotation system with an optical system using multiple fixed gratings and a movable mirror. Instead of mechanically rotating a single grating, the system uses optical switching between multiple stationary gratings, eliminating mechanical transmission mechanisms while maintaining wavelength scanning capability through optical path control.
Solution Approach 2:
The patent divides the wavelength scanning function into multiple discrete grating elements, each optimized for specific wavelength ranges. By segmenting the grating system into multiple fixed gratings that can be selectively activated, the system achieves wavelength scanning without requiring a single large mechanical rotation mechanism.
2Productivity
If multiple photodetectors are used to measure multiple spectrum channels simultaneously, then measurement efficiency improves, but device complexity and cost increase
Solution Approach 1:
The patent merges multiple spectrum channel measurements into a single photodetector by using a movable mirror to sequentially direct different wavelength ranges to the same detector. This combining approach maintains multi-channel measurement capability while reducing the number of photodetectors needed, thereby simplifying the device structure and reducing costs.
Solution Approach 2:
The patent introduces dynamic control through a movable mirror that can be positioned to direct different wavelength ranges to the photodetector. This dynamic optical switching enables a single photodetector to sequentially measure multiple spectrum channels, achieving multi-channel measurement efficiency without requiring multiple simultaneous photodetectors.
3Measurement precision
If grating replacement is performed to improve wavelength resolution across wide wavelength regions, then wavelength resolution improves, but device complexity and operation time increase
Solution Approach 1:
The patent segments the wavelength measurement function across multiple fixed gratings, each optimized for specific wavelength ranges with high resolution. By having multiple gratings available in fixed positions, the system achieves high wavelength resolution across the entire wide wavelength region without requiring mechanical replacement of gratings.
Solution Approach 2:
The patent prepares multiple gratings in advance, each optimized for specific wavelength ranges, and positions them in fixed locations. This preliminary arrangement eliminates the need for runtime grating replacement, as the appropriate grating is already in position and can be selected through optical switching, thereby reducing operation time and complexity.
4Measurement precision
If color filters are added to filter high-order diffraction light, then measurement accuracy improves, but device complexity increases
Solution Approach 1:
The patent replaces the color filter system with a grating-based optical sorting mechanism. By using multiple gratings with different groove densities and angles, the system achieves wavelength separation and high-order diffraction filtering through geometric optics rather than absorption filters, thereby maintaining measurement accuracy while reducing 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 design simplifies the instrument structure, enhances long-term reliability, and enables rapid, high-resolution imaging of multiple channels without mechanical displacement, improving service lifetime and data acquisition efficiency.
Implementation Method 1
a multichannel integrated grating with sub-gratings... incident light enters the corresponding integrated gratings along each light source incident slits and then is focused by the shared two-dimensional focus imaging mirror after diffraction of the integrated grating
Implementation Method 2
a shared two-dimensional focus imaging mirror... incident light enters the corresponding integrated gratings along each light source incident slits and then is focused by the shared two-dimensional focus imaging mirror after diffraction of the integrated grating
Data Source
AI summary
The present invention discloses a multichannel broadband high-resolution spectrograph, comprising a plurality of light source incident slits, a multichannel integrated grating, a multichannel shared two-dimensional focus imaging mirror and a two-dimensional area array detector which are sequentially disposed along a light source incident or reflection line, wherein the multichannel integrated grating consists of a plurality of sub-gratings, incident light enters the corresponding integrated gratings along the light source incident slits and then is focused by the shared two-dimensional focus imaging mirror after diffraction of the integrated grating, and diffraction light in a full-spectrum region is incident onto a focal plane of the two-dimensional area array detector for detection. No any mechanical displacement part is disposed, multichannel, full-spectrum and high-speed detection and analysis is achieved, and the present disclosure has high spectrum resolution and working reliability.