Modular Chemiresistive Sensor for Hypergolic Fuel Leak Detection
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Solution Overview
Problem
Current sensor technologies for hypergolic fuel and oxidizer leak detection, carbon dioxide monitoring, and disease biomarker detection face challenges such as lack of specificity, limited effectiveness at elevated temperatures, maintenance burdens, and high costs, with existing systems being inefficient for rapid and accurate detection of hypergolic fuel and oxidizer leaks, and inadequate for early diagnosis of diseases like Alzheimer's and cancer.
Innovation Solution
A modular chemiresistive sensor using gold or platinum electrodes with polymer nanowires or carbon nanotubes spanning the gap, connected to a circuit board with a processor for measuring current and voltage changes, allowing for sensitive detection of hypergolic fuels, oxidizers, carbon dioxide, and disease biomarkers, with the ability to operate across a wide temperature range and provide calibration-free operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If prior art electrochemical monitoring devices are used, then detection can be performed in the range -20°C to +71°C, but the response time is typically 55 minutes at 100 ppm for NO2 and sensitivity is typically about 100 ppm for both MMH and NO2
Solution Approach 1:
The patent changes the fundamental detection mechanism from electrochemical to chemiresistive, utilizing polymer nanowires whose electrical resistance changes in response to analyte binding. This parameter change enables both improved sensitivity (detecting lower concentrations) and faster response times compared to traditional electrochemical methods
Solution Approach 2:
The invention uses composite structures combining gold or platinum electrodes with polymer nanowires (such as polyaniline, polythiophene, or polypyrrole). This composite material approach leverages the electrical conductivity of metals and the selective binding properties of functionalized polymers to achieve enhanced detection performance
2Reliability
If prior art electrochemical systems are used, then monitoring can be performed, but the devices should be replaced annually which creates maintenance burden and drives system lifecycle costs
Solution Approach 1:
The chemiresistive sensor design uses inexpensive materials (polymer nanowires on simple electrodes) that can be manufactured at low cost, enabling disposable or frequently replaceable sensors that eliminate complex maintenance protocols and reduce lifecycle costs while maintaining detection reliability
Solution Approach 2:
The sensor design incorporates self-referencing capabilities through bridge circuits that automatically compensate for drift and environmental changes, reducing the need for manual calibration and maintenance interventions
3Measurement precision
If existing sensor technologies are used for hypergolic fuel and oxidizer leak detection, then detection capability is provided, but the systems lack specificity and have limited effectiveness at elevated temperatures
Solution Approach 1:
The patent functionalizes different regions of the polymer nanowire with specific chemical groups (such as carboxylic acid, amine, or hydroxyl groups) that provide selective binding to specific analytes (MMH, NO2, CO2, or biomarkers). This local functional differentiation enables high detection specificity while the overall polymer structure maintains stability at elevated temperatures
Solution Approach 2:
The invention utilizes the temperature-dependent electrical conductivity properties of conducting polymers to not only maintain operation at elevated temperatures but potentially leverage temperature effects to enhance selectivity through differential response patterns
4Measurement precision
If prior art systems are used for CO2 monitoring, then atmospheric or above ground monitoring can be performed using LIDAR or satellite-based technologies, but by the time leaked CO2 appears above the surface, significant damage may have occurred
Solution Approach 1:
The patent replaces remote sensing technologies (LIDAR, satellite-based systems) with direct-contact chemiresistive sensors that utilize electrical resistance changes in polymer nanowires upon CO2 binding. This substitution enables immediate detection at the source without the time delays inherent in atmospheric transport to remote sensing platforms
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 modular sensor achieves reliable, rapid, and accurate detection of hypergolic fuel and oxidizer leaks, carbon dioxide, and disease biomarkers, offering improved sensitivity, stability, and cost-effectiveness, suitable for both military applications and point-of-care diagnostics.
Implementation Method 1
A polymer nanowire or carbon nanotube spans the gap between the electrodes and connects the electrodes electrically
Implementation Method 2
A modular chemiresistive sensor using gold or platinum electrodes with polymer nanowires or carbon nanotubes spanning the gap, connected to a circuit board with a processor for measuring current and voltage changes
Data Source
AI summary
The present invention relates to a modular chemiresistive sensor. In particular, a modular chemiresistive sensor for hypergolic fuel and oxidizer leak detection, carbon dioxide monitoring and detection of disease biomarkers. The sensor preferably has two gold or platinum electrodes mounted on a silicon substrate where the electrodes are connected to a power source and are separated by a gap of 0.5 to 4.0 μM. A polymer nanowire or carbon nanotube spans the gap between the electrodes and connects the electrodes electrically. The electrodes are further connected to a circuit board having a processor and data storage, where the processor can measure current and voltage values between the electrodes and compare the current and voltage values with current and voltage values stored in the data storage and assigned to particular concentrations of a pre-determined substance such as those listed above or a variety of other substances.