This presentation describes implementations of remote chemical detection capabilities developed by Pendar Technologies, allowing safe identification of explosives and toxic materials by military personnel and first responders using unmanned ground and air vehicles. These integration efforts are based on the Pendar X10 system, a handheld standoff Raman chemical identification system.
Following an update on recent improvements to the Pendar X10 platform, integration to both air and ground vehicles will be discussed. Our presentation will highlight the key design elements enabling successful remote chemical identification, as well as solutions developed specifically to facilitate integration to unmanned platforms.
This presentation introduces advances realized at Pendar Technologies on the development of fieldable IR and Raman spectroscopy systems for the detection of residues on surfaces.
In the first part of the presentation, we will focus on active standoff infrared hyperspectral imaging of small amounts of biological materials (BG and BT spores) deposited on surfaces using a compact quantum cascade laser array-based system.
In the second part, we will discuss the development of a fieldable Raman microscopy system to autonomously analyze the composition of single particles deposited on surfaces. The compact system we developed can be used in the field by non-expert users.
This article presents new hyperspectral imaging (HSI) results from a standoff chemical detection system that utilizes monolithic arrays of Distributed Feedback (DFB) Quantum Cascade Lasers (QCLs) as a source, with each array element at a slightly different wavelength than its neighbor. In this rastering approach to HSI, analysis of analyte/substrate pairs benefits from a laser source with characteristics offered uniquely by a QCL Array. In addition to describing the HSI system developed, a description of experimental standoff detection results using the man-portable system from 1.4 meters are presented. We present HSI results on two very different chemical substrate pairs; trace solid PETN on aluminum and the liquid VX on polycarbonate.
ThermoFisher Scientific (formerly Ahura Scientific) has developed a handheld, modular detection and identification system for trace-level gases, chemical vapors and aerosols, and swab analyses. The sample chamber is a separate, removable module that can be tailored specifically to the users’ needs. The vapor module can operate in three modes: ambient sampling, vapor/aerosol preconcentration, and direct injection. A swab module can be used to analyze thermally desorbed vapors from a sample swab. Limits of identification for vapors are as low as 0.1 ppm following a 15-min preconcentration period. The swab module can detect as little as 5 μg of TNT.
KEYWORDS: Vertical cavity surface emitting lasers, Near field scanning optical microscopy, Near field optics, Near field, Composites, Metals, Spectroscopy, Multimode fibers, Associative arrays, Reliability
We have studied the spatial and spectral characteristics of vertical-cavity surface-emitting laser emission using near- field scanning optical microscopy. We report the multi- transverse-mode characteristics of 15 micrometers diameter proton- implanted 850 nm devices used in a 2 Gbit/s multimode fiber- optic links. Spectrally resolved and integrated intensity scans over a 20 X 20 area were performed. The intensity of each resolvable transverse mode was integrated and its wavelength range false-colored at each scan position. The resulting composite image displays relative intensity and spatial distribution information for each transverse mode. Correlation with the shear force data allows mapping of the optical distributions to topographical features. Lasing filaments were observed at high drive currents. Gain competition among spatially overlapping transverse modes was observed while spatially isolated modes coexisted without competition.
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