Raman Sample Chamber Resonator With Diffraction Grating Feedback
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Solution Overview
Problem
Existing Raman spectroscopy devices for industrial applications face challenges with high costs, large installation space requirements, and complex designs due to the need for powerful lasers and external resonators, which compromise measurement sensitivity and compactness.
Innovation Solution
The sample chamber is positioned within the external resonator, utilizing a diffraction grating for both laser light feedback and spectral separation, eliminating the need for a separate dispersing element and allowing a compact design with enhanced irradiation power and signal strength, combined with a laser diode and optional hollow-core fiber for signal amplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a powerful laser unit is used to achieve sufficient Raman signal strength, then measurement sensitivity is improved, but device cost and energy consumption increase
Solution Approach 1:
The patent combines the laser cavity and sample chamber into a single integrated structure. The sample chamber serves dual purposes: as the measurement cell and as part of the laser resonator cavity, eliminating the need for separate components and reducing overall device complexity while maintaining measurement sensitivity
Solution Approach 2:
The sample chamber is designed to perform multiple functions simultaneously: it acts as both the sample containment vessel and the laser resonator cavity. This multi-functionality reduces the number of components needed, lowering device cost while maintaining the required measurement sensitivity through the integrated design
2Measurement precision
If an external resonator is added to reduce laser linewidth, then spectral resolution is improved, but installation space requirements increase
Solution Approach 1:
The patent merges the external resonator function with the sample chamber by making the sample chamber itself part of the resonator cavity. This integration achieves the required spectral resolution through linewidth reduction while eliminating the need for additional space-consuming external resonator components
Solution Approach 2:
The laser cavity is nested within the sample chamber structure. The resonator components are arranged concentrically or integrally with the sample chamber, allowing the resonator function to be embedded within the existing spatial footprint of the measurement device without requiring additional installation space
3Measurement precision
If a separate dispersing element is used for spectral separation, then spectral resolution is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The diffraction grating is designed to perform multiple functions: it serves as both the spectral dispersing element for Raman signal separation and as the output coupler for the laser resonator. This dual functionality maintains spectral resolution while reducing the number of separate components and simplifying the overall device design
Solution Approach 2:
The patent combines the dispersing function with the laser feedback mechanism by using the same diffraction grating for both purposes. The grating simultaneously separates Raman signals spectrally and provides the necessary optical feedback to the laser cavity, eliminating the need for separate dispersing elements and reducing design 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 configuration achieves high measurement sensitivity and a compact, cost-effective design with improved spectral resolution and signal detection, using a diffraction grating for both laser feedback and signal separation, enabling efficient analysis of gases and liquids.
Implementation Method 1
a dispersing element which is arranged at a distance from the light-emitting surface such that it is acted upon by the laser beam and, for feedback purposes, sends at least a part of the laser light back towards the light-emitting surface
Implementation Method 2
a laser system for irradiating the sample substance located in the sample chamber with laser light
Implementation Method 3
Raman spectroscopy investigates the inelastic scattering of light by matter by spectrally analyzing the light scattered by a substance. The detected frequency shifts compared to the incident light result from quantized rotational, vibrational, and rotational-vibrational transitions
Implementation Method 4
a detection unit for generating a Raman spectrum based on scattered light emanating from the sample substance
Data Source
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AI summary
An analysis device (11) for analyzing a sample substance (13) using Raman spectroscopy comprises a sample chamber (14) for receiving the sample substance (13), a laser system (17) for irradiating the sample substance (13) located in the sample chamber (14) with laser light, and a detection unit (29) for generating a Raman spectrum based on scattered light emitted by the sample substance (13). The laser system (17) has a laser unit (19) with a light exit surface (23) for the exit of a laser beam and a dispersing element (25) arranged at a distance from the light exit surface (23) such that it is exposed to the laser beam and, for feedback, sends at least a portion of the laser light back toward the light exit surface (23).The sample chamber (14) is arranged between the laser unit (17) and the dispersing element (25) and the detection unit (29) is arranged such that it receives the scattered light emanating from the sample substance (13) via the dispersing element (25).