Porous Material Layer for Gas Analyte Detection
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Solution Overview
Problem
Existing detection systems for analytes in gaseous samples face issues such as non-uniform illumination leading to spatially heterogeneous response signals, reduced resolution, and decreased sensitivity over time due to the use of sol-gel materials deposited by dip coating and two-dimensional detection zones, which limit the detection capabilities and operating time.
Innovation Solution
A system with a three-dimensional porous material layer extending along the fluidic path, containing probe molecules that react with analytes, is illuminated successively at distinct detection zones, allowing for constant and precise optical detection of spectral property modifications, maintaining sensitivity over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the light excitation source illuminates the whole thin layer simultaneously, then the detection area is maximized, but the response signal becomes spatially heterogeneous and resolution is reduced
Solution Approach 1:
The thin layer is divided into multiple detection zones that are illuminated successively rather than simultaneously. Each zone can be independently illuminated and detected, allowing spatial resolution to be maintained while covering the entire layer area over time.
Solution Approach 2:
The illumination is performed periodically by successively illuminating different detection zones. This periodic scanning approach allows the system to cover the entire detection area while maintaining resolution through sequential measurement of each zone.
2Area of stationary object
If the light excitation source illuminates areas not directly located in the fluidic path, then the illumination coverage is maximized, but the response signal is reduced and resolution is degraded
Solution Approach 1:
Different zones of the thin layer are illuminated selectively based on their location relative to the fluidic path. Areas directly in the fluidic path are illuminated to provide strong response signals, while other areas are illuminated sequentially to maintain coverage without compromising resolution.
3Measurement precision
If the probe molecules react with the analyte, then the detection sensitivity is improved, but the sensitivity degrades over time as probe molecules are consumed
Solution Approach 1:
The system monitors the response signal over time to detect when probe molecules are depleted. When sensitivity degrades due to probe consumption, the system can identify this and trigger regeneration or replacement of the probe molecules to restore detection capability.
Solution Approach 2:
The system uses feedback from the response signal to monitor the state of probe molecules. When the signal indicates probe depletion, the system can automatically initiate regeneration processes or alert the user to replace the probe layer, maintaining operational sensitivity over extended periods.
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 enhances the resolution and maintains constant sensitivity by ensuring all areas of the porous material are traversed and illuminated, allowing for effective detection and quantification of analytes with improved spatial coverage and prolonged system performance.
Implementation Method 1
The gaseous sample flows in the fluidic chamber and naturally comes into contact with the thin layer of sol-gel nanoporous material and is introduced therein, due to the porosity of the material
Implementation Method 2
The probe molecules then react with the formaldehydes, which results in a variation of the spectral properties of these probe molecules
Implementation Method 3
An optical detection device makes it possible to detect said variation in the spectral properties of the probe molecules before and after reaction with formaldehyde, in particular a variation in the absorbance or fluorescence spectra
Implementation Method 4
The light excitation source illuminates the entire layer of sol-gel nanoporous material according to a determined wavelength or on a given spectrum of wavelengths, and the collector receives the transmitted or reflected light, or the light emitted by fluorescence
Data Source
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AI summary
The system i.e. detector (1), has a porous material layer (30) formed at a surface (21) of transparent or translucent substrate (20) so as to longitudinally extend along a fluid flow path of gas sample, where the layer contains a set of probe molecules (31). A generation unit (41) generates flow of gas sample along the flow path, so that the gaseous sample contacts the porous material layer. An optical detection device (50) successively detects modification of spectral properties of one of the probe-molecules at distinct detection zones of the layer distributed along the path. The layer is made of micro porous or sol-gel nanoporous material of metal oxides or polymer. Independent claims are also included for the following: (1) a method for production of a detection system of analytes in a gas sample (2) a method for detecting analytes of interest present in a gas sample.