Microscopic Raman Spectroscopy Layout Without Grating Switching
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Solution Overview
Problem
Existing microscopic Raman spectroscopy devices face issues with structural complexity, increased size, and cost due to the need for multiple apertures, diffraction gratings, and CCD detectors that are physically switched, leading to potential position reproducibility problems affecting analysis accuracy.
Innovation Solution
A microscopic Raman spectroscopy device with multiple excitation light sources and a simplified spectrometer design, using diffraction gratings and detectors without physical switching, where optical systems guide Raman scattering light to diffraction gratings and a single imaging lens forms images on the detector, eliminating the need for aperture and grating switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple apertures, diffraction gratings, and CCD detectors are physically switched according to different excitation laser lights, then sample analysis accuracy can be maintained by selecting optimal wavelengths, but the structure of the spectrometer becomes complicated and size increases
Solution Approach 1:
A single spectrometer unit is designed to handle multiple excitation wavelengths simultaneously through a fixed optical path with multiple incident apertures and a diffraction grating that can disperse different wavelengths to appropriate detector regions, eliminating the need for physical switching mechanisms while maintaining analysis accuracy
Solution Approach 2:
Multiple incident apertures, diffraction gratings, and CCD detectors are merged into a single integrated spectrometer unit with a unified optical path, where the diffraction grating disperses light from multiple apertures and a single CCD detector captures spectra from different wavelengths simultaneously, simplifying the overall structure
2Adaptability or versatility
If physical switching mechanisms are introduced to change apertures, diffraction gratings, and detectors, then different excitation wavelengths can be accommodated, but position reproducibility of movable parts may deteriorate
Solution Approach 1:
Instead of switching between different gratings and detectors for different wavelengths, the invention inverts the approach by using a single fixed grating and detector that can simultaneously handle multiple wavelengths through proper optical path design, where the grating disperses different wavelengths to different spatial regions on the same detector
Solution Approach 2:
The mechanical switching system is replaced with a fixed optical path system where multiple incident apertures feed into a single diffraction grating, and the dispersed light from different wavelengths is captured by a single CCD detector without any moving parts, eliminating position reproducibility issues entirely
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 reduces the size and cost of the spectrometer while ensuring high-accuracy sample analysis by preventing overlap between Raman scattering light and fluorescence, and eliminating position reproducibility issues from movable parts.
Implementation Method 1
a spectrometer that uses diffraction gratings to disperse Raman scattering light
Implementation Method 2
an imaging lens that forms an image of a plurality of Raman scattering light beams dispersed by the diffraction gratings on the detector
Implementation Method 3
a detector that detects and photoelectrically converts the Raman scattering light dispersed by the spectrometer
Data Source
AI summary
A microscopic Raman spectroscopy device includes laser oscillators (excitation light sources) that emit excitation laser lights (excitation lights) of different wavelengths, a spectrometer that uses a diffraction grating to disperse Raman scattering light emitted from a sample by irradiation with the excitation laser light from the laser oscillator, and a CCD detector that detects and photoelectrically converts the Raman scattering light dispersed by the spectrometer. The spectrometer includes incident apertures, a plurality of (two) optical systems that guide the Raman scattering light incident from the incident aperture to the diffraction grating, and a plurality of light beams dispersed by the diffraction grating are incident on one imaging lens in tandem.