Electronic Nose Reference Sensor for Noise Correction
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Solution Overview
Problem
Electronic noses face challenges in accurately distinguishing between measurement noise and sensor drift, leading to unreliable and reproducible results due to the difficulty in identifying and correcting for parasitic signals and gradual signal variations over time.
Innovation Solution
Incorporating a reference sensor with a sensitive part functionalized by fluorinated compounds, such as those with perfluorinated terminal alkyl groups, to provide a signal representative of measurement noise, allowing for the correction of drift and noise in the detection system, thereby enhancing reliability and reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a reference sensor is added to the detection system, then measurement noise and sensor drift can be corrected, but device complexity increases
Solution Approach 1:
A reference sensor functionalized with fluorinated compounds serves as an intermediary element that does not interact with target analytes but captures environmental noise and drift. This mediator sensor allows separation of useful signals from parasitic signals, enabling correction of measurement errors without fundamentally changing the detection principle of the main sensors.
Solution Approach 2:
The detection system is segmented into two functional parts: detection sensors for target compound analysis and a reference sensor for noise/drift characterization. This segmentation allows independent optimization and processing of different signal components, improving overall measurement precision while managing system complexity through modular architecture.
2Reliability
If fluorinated compounds are used to functionalize the reference sensor, then reliability improves through noise correction, but manufacturing complexity increases
Solution Approach 1:
The reference sensor uses fluorinated compounds (such as perfluorinated terminal alkyl groups) to modify its surface properties, creating a chemically inert surface that responds only to environmental changes rather than specific analytes. This parameter change in surface chemistry enables the reference sensor to reliably track noise and drift while maintaining manufacturability through established surface functionalization techniques.
3Device complexity
If measurement noise is not corrected, then the system remains simple, but measurement precision deteriorates over time
Solution Approach 1:
The reference sensor provides continuous feedback on environmental noise and sensor drift conditions. This feedback information is used to correct the signals from detection sensors in real-time, maintaining measurement precision without requiring complex preventive measures or frequent recalibration, thus balancing simplicity with 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 solution effectively isolates and corrects measurement noise and sensor drift, improving the reliability and longevity of electronic nose operations by providing a stable and accurate detection system for volatile compounds.
Implementation Method 1
In chemical gas multisensors whose operation is based on an interaction between gases and gas-specific sensors, it is known to provide for the presence of a reference sensor to compensate for measurement noise, this sensor being typically an area of the multisensor which is free of sensitive material as described, for example, by Y. C. Lee et al. (19th International Conference on Solid-State Sensors, Actuators and Microsystems (Transducers), IEEE, 2017, pp. 672-675, hereinafter reference [2]) for measuring a fluorescence reference (insensitive to the chemical environment). In this case, the gaseous compounds will quench the fluorescence signal of the sensors.
Data Source
AI summary
The invention relates to a detection system for an electronic nose capable of detecting and identifying a set of compounds that can be found in a gaseous sample, the detection system comprises a plurality of cross-reactivity detection sensors (D1, D2, D3, D4, D5, D6, D7) for supplying signals representing the presence of one or more compounds of said set in the gaseous sample, and which is particularly characterised in that the detection system further comprises at least one reference sensor (RI) for supplying a signal representing the measurement noise of the detection system. The detection system further relates to an electronic nose comprising such a detection system.