Rapid detection of infrared backscatter for standoff detection of trace explosives

2020 ◽  
Author(s):  
Christopher J. Breshike ◽  
Christopher A. Kendziora ◽  
Robert Furstenberg ◽  
Yohan Yoon ◽  
Tyler J. Huffman ◽  
...  
Keyword(s):  
Rapid Detection ◽  
Standoff Detection ◽  
Trace Explosives

scholarly journals Deep Ultraviolet Standoff Photoacoustic Spectroscopy of Trace Explosives

2018 ◽  
Vol 73 (6) ◽  
pp. 601-609 ◽  
Author(s):  
Alyssa B. Zrimsek ◽  
Sergei V. Bykov ◽  
Sanford A. Asher
Keyword(s):  
Photoacoustic Spectroscopy ◽  
Signal Strength ◽  
Pentaerythritol Tetranitrate ◽  
Gaseous Species ◽  
Absorption Bands ◽  
Standoff Detection ◽  
Deep Ultraviolet ◽  
Deep Uv ◽  
Trace Explosives ◽  
The Impact

We demonstrate deep ultraviolet (UV) photoacoustic spectroscopy (PAS) of trace explosives using a sensitive microphone at meter standoff distances. We directly detect 10 µg/cm2 of pentaerythritol tetranitrate (PETN), 2,4,6-trinitrotoluene (TNT), and ammonium nitrate (AN) with 1 s accumulations from a 3 m standoff distance. Large PAS signals for standoff detection are achieved by exciting into the absorption bands of the explosives with a 213 nm laser. We also investigate the impact of the deep UV photochemistry of AN on the PAS signal strength and stability. We find that production of gaseous species during photolysis of AN enhances the PAS signal strength. This deep UV photochemistry can, however, limit the PAS signal lifetimes when detecting trace quantities.

Methodology for using active infrared spectroscopy in standoff detection of trace explosives

2017 ◽  
Author(s):  
Christopher J. Breshike ◽  
Christopher A. Kendziora ◽  
Robert Furstenberg ◽  
Viet Nguyen ◽  
R. Andrew McGill
Keyword(s):  
Infrared Spectroscopy ◽  
Standoff Detection ◽  
Trace Explosives

Broadband infrared imaging spectroscopy for standoff detection of trace explosives

2016 ◽  
Author(s):  
Christopher A. Kendziora ◽  
Robert Furstenberg ◽  
Michael Papantonakis ◽  
Viet Nguyen ◽  
R. Andrew McGill
Keyword(s):  
Infrared Imaging ◽  
Imaging Spectroscopy ◽  
Standoff Detection ◽  
Trace Explosives

Advances in standoff detection of trace explosives by infrared photo-thermal imaging

2010 ◽  
Author(s):  
Christopher A. Kendziora ◽  
Robert Furstenberg ◽  
Michael Papantonakis ◽  
Viet Nguyen ◽  
Jennifer Stepnowski ◽  
...  
Keyword(s):  
Thermal Imaging ◽  
Standoff Detection ◽  
Trace Explosives

Infrared backscatter imaging spectroscopy for standoff detection of trace explosives

2019 ◽  
Author(s):  
Christopher J. Breshike ◽  
Christopher A. Kendziora ◽  
Yohan Yoon ◽  
Robert Furstenberg ◽  
Viet Nguyen ◽  
...  
Keyword(s):  
Imaging Spectroscopy ◽  
Standoff Detection ◽  
Trace Explosives

Point and standoff detection of trace explosives using quantum cascade lasers

2014 ◽  
Author(s):  
Seonghwan Kim ◽  
Dongkyu Lee ◽  
Xunchen Liu ◽  
C. W. Van Neste ◽  
Thomas Thundat
Keyword(s):  
Quantum Cascade Lasers ◽  
Quantum Cascade ◽  
Standoff Detection ◽  
Trace Explosives ◽  
Cascade Lasers

Search mode for rapid detection of virus particles

1991 ◽  
Vol 49 ◽  
pp. 286-287
Author(s):  
O. E. Bradfute
Keyword(s):  
Electron Microscopy ◽  
Rapid Detection ◽  
Plant Virus ◽  
Low Dose ◽  
Search Mode ◽  
Virus Diseases ◽  
Virus Particles ◽  
Focus Image ◽  
Time Required ◽  
Rapid Switching

Electron microscopy is frequently used in preliminary diagnosis of plant virus diseases by surveying negatively stained preparations of crude extracts of leaf samples. A major limitation of this method is the time required to survey grids when the concentration of virus particles (VPs) is low. A rapid survey of grids for VPs is reported here; the method employs a low magnification, out-of-focus Search Mode similar to that used for low dose electron microscopy of radiation sensitive specimens. A higher magnification, in-focus Confirm Mode is used to photograph or confirm the detection of VPs. Setting up the Search Mode by obtaining an out-of-focus image of the specimen in diffraction (K. H. Downing and W. Chiu, private communications) and pre-aligning the image in Search Mode with the image in Confirm Mode facilitates rapid switching between Modes.

Identification of hepatitis a virus in cell cultures by solid phase immune electron microscopy

1986 ◽  
Vol 44 ◽  
pp. 238-239
Author(s):  
C.D. Humphrey ◽  
T.L. Cromeans ◽  
E.H. Cook ◽  
D.W. Bradley
Keyword(s):  
Electron Microscopy ◽  
Liquid Phase ◽  
Cell Cultures ◽  
Rapid Detection ◽  
Hepatitis A ◽  
Hepatitis A Virus ◽  
Solid Phase ◽  
Immune Electron Microscopy ◽  
Detection And Identification

There is a variety of methods available for the rapid detection and identification of viruses by electron microscopy as described in several reviews. The predominant techniques are classified as direct electron microscopy (DEM), immune electron microscopy (IEM), liquid phase immune electron microscopy (LPIEM) and solid phase immune electron microscopy (SPIEM). Each technique has inherent strengths and weaknesses. However, in recent years, the most progress for identifying viruses has been realized by the utilization of SPIEM.

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