Standoff Spectroscopy Using Conditioned Target Residues
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Solution Overview
Problem
Conventional spectroscopy methods are limited in their ability to detect and analyze small target residues from a distance and cannot resolve unique spectra due to their reliance on optical excitation of by-products, preventing effective identification of surface materials.
Innovation Solution
A standoff spectroscopy system that uses a conditioning source to modify residues with radiation, such as ultraviolet light, and a spectral generating source to measure and compare spectra before and after exposure, allowing for the identification of surface residues through differential analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional spectroscopy methods are used to detect target residues, then the measurement can be performed, but the ability to resolve unique spectra and identify surface materials is insufficient
Solution Approach 1:
The system performs preliminary action by conditioning the target residue with UV radiation before spectral measurement. This pre-treatment step modifies the residue to generate detectable by-products, enabling subsequent spectral detection that would otherwise be impossible or inconclusive with conventional methods.
Solution Approach 2:
The system introduces an intermediary substance or reaction product generated when UV conditioning interacts with the target residue. These by-products serve as mediators that produce detectable spectral signatures, allowing indirect identification of the original residue materials that would not be directly detectable.
2Productivity
If laser induced fluorescence is used to vaporize the target, then partial vaporization can be achieved, but the unique spectrum of the target material cannot be measured
Solution Approach 1:
The system applies preliminary UV conditioning to the target residue before attempting spectral detection. This pre-treatment modifies the residue composition and generates characteristic by-products that serve as spectral fingerprints, enabling unique identification without relying on fluorescence from vaporized material.
Solution Approach 2:
The system changes the measurement parameters by detecting spectral absorption characteristics of UV-conditioned residue by-products rather than measuring fluorescence emission from vaporized target material. This parameter change enables unique spectrum identification through a different physical mechanism.
3Measurement precision
If conventional spectroscopy methods are used, then detection can be performed, but the capability to detect small target residues from a distance is limited
Solution Approach 1:
The system performs preliminary UV conditioning of the target residue at a distance before spectral measurement. This pre-treatment step concentrates and modifies the residue material in place, enhancing the spectral signal strength and enabling detection from greater standoff distances than would be possible with conventional direct spectroscopy.
Solution Approach 2:
The system uses UV radiation as an intermediary to remotely condition the target residue, generating detectable by-products that serve as spectral mediators. These intermediary reactions enable enhanced detection sensitivity at distance by creating stronger spectral signals from the conditioned residue without requiring close proximity.
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
Enables the detection and identification of molecules on a surface from a distance without contact, effectively resolving the limitations of conventional methods by differentiating between residues through spectral comparison, enhancing the capability to detect explosives, medical conditions, and other chemical substances.
Implementation Method 1
A conditioning source emits radiation that modifies the residue, such as through decomposition
Implementation Method 2
A spectral generating source measures a spectrum of the residue before and after the residue is exposed to the radiation from the conditioning source
Data Source
AI summary
A system and method are disclosed for standoff spectroscopy of molecules (e.g. from a residue) on a surface from a distance. A source emits radiation that modifies or conditions the residue, such as through photodecomposition. A spectral generating source measures a spectrum of the residue before and after the residue is exposed to the radiation from that source. The two spectra are compared to produce a distinct identification of the residues on the surface or identify certain properties of the residue.