Aerosol Detection Standoff System Using Collection Arm
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Solution Overview
Problem
Current chemical and biological aerosol detection systems lack a true standoff capability, often requiring contact with the sample, which leads to contamination and potential hazards during reuse.
Innovation Solution
A system comprising a collection arm and a detection module configured to collect and analyze aerosol samples from a cloud while maintaining a standoff distance, utilizing an optical detection module to determine the chemical composition of the aerosol particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If contact-based detection systems (mobility spectrometry and mass spectrometry) are used to achieve strong chemical identification capability, then detection specificity is improved, but system contamination occurs and reliability deteriorates
Solution Approach 1:
The system divides the detection function into two separate modules: a collection arm that physically contacts the aerosol cloud to gather samples, and a detection module that remains isolated from the cloud. This segmentation allows the detection module to maintain reliability while the collection arm handles contamination, resolving the contradiction between measurement precision and system reliability.
Solution Approach 2:
The collection arm acts as an intermediary between the aerosol cloud and the detection module. It collects aerosol particles through its opening and transports them via a collection tube to the detection module, which never directly contacts the cloud. This intermediary mechanism enables strong chemical identification capability while preventing system contamination.
2Reliability
If optically based systems are used to operate from a safe distance, then standoff capability is improved, but detection limits worsen and measurement precision deteriorates
Solution Approach 1:
The system performs preliminary action by collecting and concentrating aerosol particles onto the collection medium within the collection arm before optical detection occurs. This pre-concentration step enhances the signal strength for subsequent optical detection, allowing the system to maintain both standoff capability and improved detection limits.
Solution Approach 2:
The system uses pneumatic principles through the collection tube to transport aerosol particles from the collection arm to the detection module. This controlled fluid transport mechanism enables the system to maintain standoff distance while ensuring sufficient sample delivery to the detection module for accurate measurement.
3Reliability
If a collection arm with extended length is used to increase standoff distance, then safety against contamination is improved, but device complexity increases
Solution Approach 1:
The collection arm employs a flexible shroud that can be extended or retracted to adjust standoff distance. This flexible structure provides contamination protection through extended length while maintaining relatively simple device architecture compared to rigid extended structures, resolving the contradiction between reliability and device complexity.
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 effectively identifies chemical cloud constituents and maps cloud dimensions and direction of travel while minimizing exposure to contamination, enabling safe and efficient detection and decontamination protocols.
Implementation Method 1
A collection medium can be disposed at an inlet of the collection tube configured to collect aerosol particles from the cloud and condense the aerosol particles onto the collection medium.
Implementation Method 2
The optical detection module can include a radiation source configured to transmit an interrogation beam through the plenum to interrogate the collection medium. The optical detection module can also include a radiation receiver configured to receive a return signal through the plenum from the collection medium.
Data Source
AI summary
In accordance with at least one aspect of this disclosure, a system includes, a collection arm configured to collect an aerosol sample from a cloud and a detection module operatively connected to the collection arm configured to analyze a composition of the sample from the cloud. In certain embodiments, one or more of the collection arm and/or the detection module can be configured to couple to a mobile platform, including for example, a land vehicle, aircraft, or watercraft. In certain embodiments one or more of the collection arm and/or the detection module can be configured to couple to a stationary structure, for example a building