Multiple-Wavelength Reflective Raman Probe for High-Efficiency Detection
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Solution Overview
Problem
Traditional Raman systems face challenges in efficiently collecting Raman scattering light due to low numerical aperture in low magnification lenses, leading to sample damage from high energy density, especially for samples with low damage thresholds, and result in intensity decline or wavenumber shift of Raman spectra.
Innovation Solution
A multiple-wavelength reflective Raman probe using four parabolic mirrors to disperse energy at the sample position, employing reflective optical elements to maintain focal spot size and efficiency across different wavelengths, eliminating chromatic aberration and reducing energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a low magnification objective lens is used to enlarge the focus light point, then the energy density is reduced, but the numerical aperture is small which reduces the collection efficiency of Raman scattering light
Solution Approach 1:
The patent divides the optical system into separate functional modules: a condensing lens for focusing excitation light and a collecting lens for collecting Raman scattering light. This segmentation allows each lens to be optimized independently - the condensing lens can use higher magnification while the collecting lens provides large numerical aperture, resolving the contradiction between energy density and collection efficiency.
Solution Approach 2:
The patent introduces a beam splitter as an intermediary element that separates the excitation light path from the collection light path. This allows independent optimization of the condensing and collecting optical paths, enabling high energy density focusing while maintaining high collection efficiency through the beam splitter's directional separation of light paths.
2Reliability
If a high magnification objective lens is used to achieve high collection efficiency, then the focusing spot becomes smaller, but the energy density increases causing sample damage
Solution Approach 1:
The patent segments the optical functions into distinct condensing and collecting paths with separate lenses. The condensing lens focuses excitation light to achieve high collection efficiency, while the collecting lens with large numerical aperture gathers Raman scattering light, preventing excessive energy concentration on the sample and avoiding damage.
Solution Approach 2:
The beam splitter acts as an intermediary that directs excitation light through the condensing lens while directing collected Raman light through the collecting lens to the detector. This intermediary separation ensures that high magnification for collection efficiency does not result in harmful energy concentration on the sample.
3Device complexity
If a single objective lens is used for both condensing and receiving light, then the device complexity is reduced, but the light collection efficiency is insufficient
Solution Approach 1:
The patent segments the single objective lens function into separate condensing lens and collecting lens components with a beam splitter. Although this increases the number of optical elements, each component is optimized for its specific function, resulting in significantly improved light collection efficiency that compensates for the increased structural complexity.
Solution Approach 2:
The beam splitter serves as an intermediary that enables the separation of condensing and collecting functions while maintaining a relatively compact overall structure. This intermediary approach allows independent optimization of each optical path for maximum efficiency.
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
Enhances light collection efficiency by eight times, prevents sample damage, and maintains consistent focal plane positioning across wavelengths, improving analytical accuracy and reproducibility.
Implementation Method 1
The first parabolic mirror receives the laser beam and reflects the laser beam into a collimated light beam
Implementation Method 2
The second mirror surface condenses the collimated light beam and reflects out a convergent light beam to the sample surface
Implementation Method 3
The third parabolic mirror surface collects a Raman scattering light reflected by the sample detecting position and reflects as a collimated detection light beam
Implementation Method 4
The fourth mirror surface collects the Raman scattering light and condenses to an output light beam
Implementation Method 5
The collimated light beam passes through a long pass filter to remove the excitation laser beam
Data Source
AI summary
A multiple-wavelength reflective Raman probe includes a first parabolic mirror, a second parabolic mirror, a third parabolic mirror, and a fourth parabolic mirror. The first parabolic mirror receives a laser light, and reflects as a collimated light beam. The second parabolic mirror receives the collimated light beam, and condenses to a convergent light beam. The third parabolic mirror has a through hole. The convergent light beam passes through the through hole, and is focused on the sample detecting position. The third parabolic mirror also collects the light reflected by the sample detecting position and reflects as a collimated detection light beam. The fourth parabolic mirror collects the detection light beam, and condenses to a detection output light beam. The detection output light beam is focused at a focal point of the fourth parabolic mirror to be collected by a spectrometer.