Differential reflection spectroscopy system and method for detecting explosives and other target materials
First Claim
1. A method for identifying explosive materials, comprising the steps of:
- irradiating a first location and a second location of a sample suspected of having one or more target materials deposited thereon with a broadband light source emitting light in the range of 200 nm to 500 nm, said second sample location spaced apart from said first sample location, wherein the target materials comprise one or more explosive comprising materials, exclusive of liquid solvents having one or more solutes comprising explosive materials;
measuring reflected light emanated from said first sample location (R1) and reflected light emanated from said second sample location (R2);
generating a differential reflection spectrum (DRS) for said sample by calculating a normalized difference in reflectivity of said first and said second sample locations (Δ
R/ R), wherein Δ
R=R2-R1 is the difference of the measured reflected light from said first and said second sample locations, and wherein R=(R1+R2) /2 is an average reflectivity of said sample; and
identifying said one or more explosives or other target materials if present on said sample based on comparing said generated DRS to at least one reference DRS for said one or more explosives or other target materials.
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Abstract
A system and method for identifying explosive or other target materials includes the steps of irradiating a first location and a second location spaced apart from the first location from a sample suspected of including explosives with ultraviolet, visible or infrared light, measuring reflected light emanated from the first sample location (R1) and reflected light emanated from the second sample location (R2), and calculating a normalized difference in reflectivity (ΔR/
29 Citations
20 Claims
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1. A method for identifying explosive materials, comprising the steps of:
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irradiating a first location and a second location of a sample suspected of having one or more target materials deposited thereon with a broadband light source emitting light in the range of 200 nm to 500 nm, said second sample location spaced apart from said first sample location, wherein the target materials comprise one or more explosive comprising materials, exclusive of liquid solvents having one or more solutes comprising explosive materials; measuring reflected light emanated from said first sample location (R1) and reflected light emanated from said second sample location (R2); generating a differential reflection spectrum (DRS) for said sample by calculating a normalized difference in reflectivity of said first and said second sample locations (Δ
R/R ), wherein Δ
R=R2-R1 is the difference of the measured reflected light from said first and said second sample locations, and whereinR =(R1+R2) /2 is an average reflectivity of said sample; andidentifying said one or more explosives or other target materials if present on said sample based on comparing said generated DRS to at least one reference DRS for said one or more explosives or other target materials. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system for identifying explosive materials, comprising:
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a broadband light source emitting light in the range of 200 nm to 500 nm for irradiating a first location and a second location of a sample surface suspected of having one or more target materials deposited thereon, said second sample location spaced apart from said first sample location, wherein the target materials comprise one or more explosive comprising materials, exclusive of liquid solvents having one or more solutes comprising explosive materials; a photodetector for measuring reflected light emanated from said first sample location (R1) and reflected light emanated from said second sample location (R2), and a computer or processor having an associated memory coupled to said photodetector, said computer or processor running software for generating a differential reflection spectrum (DRS) for said sample by calculating a normalized difference in reflectivity (Δ
R/R ) of said first and said second sample locations, where Δ
R=R2−
R1 is the difference of the measured reflected light from said first and said second sample locations andR =(R1+R2)/2 is an average reflectivity of said sample, and for identifying said one or more explosives or other target material if present on said sample based on comparing said generated DRS to at least one reference DRS for said one or more explosives or other target materials stored in said memory. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification