Raman Spectroscopy Solvent Peak Suppression

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Solution Overview

Problem

Raman spectroscopy in chemical processes, such as supercritical fluid extraction, faces challenges due to strong solvent peaks overpowering analyte peaks, making precise detection difficult, as increasing exposure time to enhance analyte visibility can lead to detector saturation and contamination.

Innovation Solution

Employing an adjustable optical filter unit with shortpass, longpass, or notch optical filters to selectively attenuate solvent Raman bands, allowing for improved measurement of analyte peaks by controlling the filter configuration dynamically during data acquisition, thereby enhancing sensitivity and fidelity of analyte detection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If exposure time is increased to enhance analyte visibility, then analyte detection sensitivity is improved, but detector saturation and contamination occur

Engineering Contradiction:

Improveanalyte detection sensitivityVSAvoiddetector saturation

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent extracts and removes the harmful solvent Raman signals from the spectral data through computational methods. By identifying and eliminating solvent peak contributions, the system enables detection of analyte peaks at lower exposure times without detector saturation, thus resolving the contradiction between sensitivity and reliability.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the parameter of spectral analysis by applying advanced signal processing techniques that transform the raw spectral data. Through parameter optimization in the analysis stage, the system achieves high analyte detection sensitivity without requiring increased exposure time that would cause detector saturation.

Inventive Principle:

Principle #35Parameter changes

2Loss of information

If solvent peaks are allowed to dominate the dynamic range, then complete spectral information is captured, but analyte peak detection becomes difficult

Engineering Contradiction:

Improvespectral information completenessVSAvoidanalyte peak detection

Core Design Contradiction:

Loss of informationVSMeasurement precision

Solution Approach 1:

The patent segments the spectral analysis process into distinct stages: first capturing the complete spectrum including solvent peaks, then separately analyzing and subtracting solvent contributions, and finally detecting analyte peaks in the processed data. This segmentation allows both complete information capture and precise analyte detection.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent performs preliminary action by pre-identifying and removing solvent peak contributions before analyte detection. This preliminary processing step eliminates the dominant solvent signals that would otherwise mask the weaker analyte peaks, enabling precise analyte measurement while preserving complete spectral information.

Inventive Principle:

Principle #10Preliminary action

3Ease of operation

If standard Raman spectroscopy is used without filtering, then simple measurement is maintained, but solvent interference prevents accurate analyte quantification

Engineering Contradiction:

Improvemeasurement simplicityVSAvoidanalyte quantification accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent introduces an intermediary computational processing step between light collection and analyte quantification. This intermediary stage applies algorithms to separate solvent and analyte signals, maintaining the simplicity of the physical measurement setup while achieving high quantification accuracy through digital signal processing.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 approach effectively suppresses strong solvent peaks, enabling more sensitive and accurate measurement of weak analyte peaks, thereby optimizing chemical process parameters in real-time, such as solvent concentration and contaminant detection, without saturating the detector.

Implementation Method 1

filtering the scattered light using one or more optical filters for selectively attenuating one or more wavelength sections for Raman analysis

Methodology Applied

Scientific EffectOptical filtering: Filter (optical)

Implementation Method 2

Raman spectroscopy involves the illumination of a sample with a laser and detailed spectroscopic analysis of the scattered light returning to the apparatus from the sample illumination region

Methodology Applied

Scientific EffectRaman scattering: Scattering

Data Source

PatentUS20250003880A1Raman spectroscopy of chemical processes with spectral blocking filters

Publication Date: 2025.01.02 TORNADO SPECTRAL SYST

AI summary

Various embodiments are provided herein for a Raman analyzer system and associated method of analyzing a chemical process including a supercritical fluid extraction process or a solvent extraction process using a Raman analyzer system where the method involves generating light stimuli and providing the light stimuli to a sample of the chemical process; collecting scattered light from the sample; filtering the scattered light using one or more selected optical filters for selectively attenuating one or more wavelength sections for Raman analysis; detecting the filtered light; and generating one or more filtered Raman spectra of the detected light.