Utilization of advanced clutter suppression algorithms for improved standoff detection and identification of radionuclide threats

<p>Active mid-infrared spectroscopy with tunable lasers is a leading technology for standoff detection and identification of trace chemicals. Information-theoretic optimal selection of the laser wavelength offers the promise of increased detection confidence at lower abundances and with fewer wavelengths. Reducing the number of wavelengths required enables faster detections and lowers sensor power consumption while keeping the optical power under eye safety limits. This paper presents an approximation to the mutual information which operates ~40000x faster than traditional techniques, thereby making near-optimal real-time sensor control computationally feasible. Application of this technique to synthetic data suggests it can reduce the number of wavelengths needed by a factor of two relative to an evenly-spaced grid, with even higher gains for chemicals with weak signatures.</p>

Download Full-text

DETECTION AND IDENTIFICATION OF TOXIC CHEMICAL VAPORS IN AN OPEN-AIR ENVIRONMENT BY A DIFFERENTIAL PASSIVE LWIR STANDOFF TECHNIQUE

International Journal of High Speed Electronics and Systems ◽

10.1142/s0129156408005485 ◽

2008 ◽

Vol 18 (02) ◽

pp. 457-468

Author(s):

HUGO LAVOIE ◽

ELDON PUCKRIN ◽

JEAN-MARC THÉRIAULT

Keyword(s):

Chemical Warfare Agents ◽

Chemical Vapor ◽

Toxic Chemical ◽

Standoff Detection ◽

Detection And Identification ◽

Atmospheric Remote Sensing ◽

Infrared Technology ◽

Warfare Agents ◽

Long Wave Infrared ◽

Measurement Approach

In this paper, the passive standoff long wave infrared technology developed for atmospheric remote sensing was used to detect and identify chemical pollutants in the atmosphere. The measurement approach is based on the differential passive standoff detection method that has been developed by DRDC Valcartier during the past few years. The measurements were performed on real chemical warfare agents and toxic chemical vapors. The results clearly demonstrate the capability of the differential radiometry approach for the detection, identification and quantification of toxic chemical vapor clouds in an open-air environment.

Download Full-text

Highly sensitive standoff detection and identification of traces of explosives and of biological and chemical agents

10.1117/12.863471 ◽

2010 ◽

Author(s):

Alexander Portnov ◽

Illana Bar ◽

Salman Rosenwaks

Keyword(s):

Standoff Detection ◽

Chemical Agents ◽

Detection And Identification ◽

Highly Sensitive

Download Full-text

Chemical agent standoff detection and identification with a hyperspectral imaging infrared sensor

10.1117/12.833478 ◽

2009 ◽

Cited By ~ 3

Author(s):

Philippe Lagueux ◽

Alexandre Vallières ◽

André Villemaire ◽

Martin Chamberland ◽

Vincent Farley ◽

...

Keyword(s):

Hyperspectral Imaging ◽

Chemical Agent ◽

Infrared Sensor ◽

Standoff Detection ◽

Detection And Identification

Download Full-text

A Fast Approximation for Adaptive Wavelength Selection for Infrared Chemical Sensors

10.26434/chemrxiv.7286243.v1 ◽

2018 ◽

Author(s):

Mark Chilenski ◽

Cara Murphy ◽

Gil Raz

Keyword(s):

Synthetic Data ◽

Optical Power ◽

Laser Wavelength ◽

Information Theoretic ◽

Standoff Detection ◽

Detection And Identification ◽

Sensor Control ◽

Selection For ◽

Trace Chemicals ◽

Selection Of

<p>Active mid-infrared spectroscopy with tunable lasers is a leading technology for standoff detection and identification of trace chemicals. Information-theoretic optimal selection of the laser wavelength offers the promise of increased detection confidence at lower abundances and with fewer wavelengths. Reducing the number of wavelengths required enables faster detections and lowers sensor power consumption while keeping the optical power under eye safety limits. This paper presents an approximation to the mutual information which operates ~40000x faster than traditional techniques, thereby making near-optimal real-time sensor control computationally feasible. Application of this technique to synthetic data suggests it can reduce the number of wavelengths needed by a factor of two relative to an evenly-spaced grid, with even higher gains for chemicals with weak signatures.</p>

Download Full-text

NOVEL APPLICATION OF PASSIVE STANDOFF RADIOMETRY FOR THE MEASUREMENT OF EXPLOSIVES

International Journal of High Speed Electronics and Systems ◽

10.1142/s0129156408005369 ◽

2008 ◽

Vol 18 (02) ◽

pp. 307-318 ◽

Cited By ~ 1

Author(s):

ELDON PUCKRIN ◽

JEAN-MARC THÉRIAULT ◽

HUGO LAVOIE ◽

DENIS DUBÉ ◽

PATRICK BROUSSEAU

Keyword(s):

Radiative Transfer ◽

Measurement Techniques ◽

Radiative Transfer Model ◽

Transfer Model ◽

Detection Capability ◽

Thermal Contrast ◽

Standoff Detection ◽

Detection And Identification ◽

Plastic Explosives

The objective of this paper is to show that explosives may potentially be detected by passive standoff FTIR radiometry. It is demonstrated that many explosives exhibit a signature (fingerprint) in the longwave infrared (LWIR) region (i.e., 8 – 14 μm). Simulations using the radiative transfer model, MODTRAN4, clearly suggest that such materials can be identified when a thermal contrast exists between the material and its environment. The explosives considered in this study include octogen (HMX), trinitrotoluene (TNT), cyclonite (RDX), and the plastic explosives, C-4 and Detasheet-C. In addition, passive FTIR measurements of HMX have been performed in the field at standoff distances up to 60 m. The development of a passive standoff detection capability based on FTIR radiometry may be a potentially useful addition to the arsenal of measurement techniques that currently exist for the detection and identification of explosive threats.

Download Full-text

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

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100142815 ◽

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.

Download Full-text