Polymer Waveguide Sensor for Multi-VOC Detection
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Solution Overview
Problem
Current sensor technologies face limitations in selectivity, particularly for analyzing multi-volatile organic compound (VOC) samples with concentrations below 1 ppm, as they often lack the ability to qualitatively and quantitatively distinguish multiple VOCs effectively.
Innovation Solution
A sensor system utilizing a metal substrate with a polymer waveguide that optically couples fiber optic cables, employing heat stripping absorption spectroscopy (HSAS) to capture, pre-concentrate, and quantify analytes by adjusting temperature thresholds and analyzing absorption spectra, allowing for the detection of specific VOCs in complex samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If semiconductor VOC sensors are used for detection, then detection capability is provided, but selectivity is poor
Solution Approach 1:
The sensor array is divided into multiple individual sensor elements, each potentially specialized for different VOC detection. This segmentation allows the system to achieve both detection capability and selectivity by assigning specific sensors to detect specific compounds while maintaining overall system functionality.
Solution Approach 2:
Different regions or elements within the sensor array are assigned different properties or sensitivities to detect specific VOCs. This local differentiation enables the sensor system to simultaneously provide detection across multiple compounds with varying selectivity characteristics optimized for each local region.
2Productivity
If electronic nose with array of non-selective sensors is used, then rapid analysis is achieved, but ability to distinguish multiple VOCs is limited
Solution Approach 1:
The sensor array is segmented into functional groups where each segment or element is optimized for detecting specific VOCs. This segmentation enables rapid analysis across multiple compounds simultaneously while maintaining the ability to distinguish between different VOC types through targeted detection capabilities.
Solution Approach 2:
The sensor array system is designed to perform multiple functions - detecting various VOCs with different selectivity characteristics while maintaining rapid analysis capability. The universal array structure allows simultaneous multi-VOC detection without sacrificing the ability to distinguish between different compound types.
3Measurement precision
If GCMS systems are used for high sensitivity and selectivity, then analyte identification is accurate, but real-time analysis capability is lost
Solution Approach 1:
The patent replaces complex mechanical GCMS separation systems with an optical sensor array that directly detects VOCs in real-time. This substitution eliminates the need for time-consuming chromatographic separation while maintaining identification accuracy through optical detection and pattern recognition algorithms.
Solution Approach 2:
The detection parameter is changed from mass-to-charge ratio (as in MS) to optical absorption characteristics. This parameter change enables real-time analysis by directly measuring VOC concentrations through optical properties rather than requiring complex separation and ionization processes, thus achieving both speed and accuracy.
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
The system achieves high selectivity and accuracy in identifying and quantifying VOCs, even at low concentrations, by pre-concentrating analytes and differentiating their absorption spectra, thereby overcoming the limitations of existing technologies in multi-VOC analysis.
Implementation Method 1
contacting a polymer waveguide with the sample, whereby the one or more analytes in the sample are captured and pre-concentrated in the polymer waveguide
Implementation Method 2
heating the polymer waveguide to a second temperature threshold and maintaining the second temperature threshold for a predetermined period of time, whereby compounds having a desorption temperature at or below the second temperature threshold are desorbed from the polymer waveguide
Implementation Method 3
transmitting light through the polymer waveguide to provide a first optical output; detecting the first optical output with an optical detector
Data Source
AI summary
A sensor for isolating, identifying, and quantifying one or more analytes in a sample is provided, the sensor having a metal substrate base and a polymer waveguide disposed on the metal substrate base, the polymer waveguide including an optical channel and a polymer disposed in the optical channel; wherein the polymer waveguide optically couples a first and a second fiber optic cable. Also provided herein are methods of using the sensor for isolating, identifying, and quantifying one or more analytes in a sample, the method including contacting the polymer waveguide with a sample, sequentially heating the sensor to a plurality of temperature thresholds, obtaining an optical output at each temperature threshold, and analyzing differences in sequentially-obtained optical outputs in order to identify and determine concentrations of individual analytes of interest in the sample.