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检索条件"任意字段=Conference on Electro-Optical Technology for Remote Chemical Detection and Identification II"

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Mid-IR Spectroscopy using Silver Halide Planar Waveguide Sensors for the chemical Sensing of Hazardous Substances

Mid-IR Spectroscopy using Silver Halide Planar Waveguide Sen...

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conference on Optics and Photon for Counterterrorism and Crime Fighting VI/optical Materials in Defence Systems technology Vii

作者： Dekel, B. Katzir, A. Acad Ctr Ruppin Sch Engn IL-40250 Emek Hefer Israel Tel Aviv Univ Sch Phys & Astron Raymond & Beverly Sackler Fac Exact Sci IL-69978 Tel Aviv Israel

ISBN: (纸本)9780819483560

There is a worldwide interest in developing a sensing system for the online detection and chemical identification of hazardous substances, especially in water and in air. Towards this goal we have developed an evanescent wave spectroscopy system based on a tunable CO2 on an IR detector and on thin AgBr flat waveguides, which were transparent in the mid-IR and served as sensing elements. Aqueous solutions of common pesticides (e.g. DDVP, Parathion, Diazinon) were placed on the waveguide and spectral absorption measurements were performed in the mid-IR. Using the results, we were able to detect these pesticides at concentrations as low as few ppm and distinguish between them. Such a system would be invaluable for homeland security applications.

关键词： Waveguides Mid-IR Silver Absorption Spectroscopy Planar waveguides Signal attenuation Liquids Glasses Refractive index

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detection of illicit drugs with the technique of Spectral Fluorescence Signatures (SFS)

Detection of illicit drugs with the technique of Spectral Fl...

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conference on Optics and Photon for Counterterrorism and Crime Fighting VI/optical Materials in Defence Systems technology Vii

作者： Poryvkina, Larisa Babichenko, Sergey Nartest AS EE-12915 Tallinn Estonia

ISBN: (纸本)9780819483560

The SFS technology has already proved its analytical capabilities in a variety of industrial and environmental tasks. Recently it has been introduced for forensic applications. The key features of the SFS method - measuring a 3-dimensional spectrum of fluorescence of the sample (intensity versus excitation and emission wavelengths) with following recognition of specific spectral patterns of SFS responsible for individual drugs - provide an effective tool for the analysis of untreated seized samples, without any separation of the substance of interest from its mixture with accompanying cutting agents and diluents as a preparatory step. In such approach the chemical analysis of the sample is substituted by the analysis of SFS matrix visualized as an optical image. The SFS technology of drug detection is realized by NarTest (R) NTX2000 analyzer, compact device intended to measure suspicious samples in liquid, solid and powder forms. It simplifies the detection process due to fully automated procedures of SFS measuring and integrated expert system for recognition of spectral patterns. Presently the expert system of NTX2000 is able to detect marijuana, cocaine, heroin, MDMA, amphetamine and methamphetamine with the detection limit down to 5% of the drug concentration in various mixtures. The numerous tests with street samples confirmed that the use of SFS method provides reliable results with high sensitivity and selectivity for identification of drugs of abuse. More than 3000 street samples of the aforesaid drugs were analyzed with NTX2000 during validation process, and the correspondence of SFS results and conclusions of standard forensic analyses with GC/MS techniques was in 99.4% cases.

关键词： illicit drugs cutting agents fluorescence NarTest

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CATSI EDM - A New Sensor for the Real-Time Passive Stand-off detection and identification of chemicals

CATSI EDM - A New Sensor for the Real-Time Passive Stand-off...

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conference on chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XI

作者： Theriault, Jean-Marc Lacasse, Paul Lavoie, Hugo Bouffard, Francois Montembeault, Yan Farley, Vincent Belhumeur, Louis Lagueux, Philippe Def Res & Dev Canada DRDC Valcartier 2459 Pie 11 Blvd N Val Belair PQ G3J 1X5 Canada AEREX Avion Inc Breakeyville G0S 1E1 PQ Canada Telops Inc Quebec City G2E 6J5 PQ Canada

ISBN: (纸本)9780819481290

DRDC Valcartier recently completed the development of the CATSI EDM (Compact Atmospheric Sounding Interferometer Engineering Development Model) for the Canadian Forces (CF). It is a militarized sensor designed to meet the needs of the CF in the development of area surveillance capabilities for the detection and identification of chemical Warfare Agents (CWA) and toxic industrial chemicals (TIC). CATSI EDM is a passive infrared double-beam Fourier spectrometer system designed for real-time stand-off detection and identification of chemical vapours at distances up to 5 km. It is based on the successful passive differential detection technology. This technique known as optical subtraction, results in a target gas spectrum which is almost free of background, thus making possible detection of weak infrared emission in strong background emission. This paper summarizes the system requirements, achievements, hardware and software characteristics and test results.

关键词： CATSI EDM passive standoff detection remote sensing area surveillance detection of CWA detection of TIC

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Multiplexed detection of biological agents using optical microchip sensors

Multiplexed detection of biological agents using optical mic...

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conference on Optics and Photon for Counterterrorism and Crime Fighting VI/optical Materials in Defence Systems technology Vii

作者： Bhatta, D. McDonnell, M. B. Perkins, E. Stratophase Ltd Unit 10A Premier Way Romsey SO51 9DL Hants England Def Sci & Technol Labs Salisbury SP4 0JQ Wilts England

ISBN: (纸本)9780819483560

A multi-channel optical microchip sensor system suitable for real-time, label-free detection of a wide range of biological agents is presented. SpectroSens (TM) chips containing multiple high-precision planar Bragg gratings are exploited as low-cost, robust refractive index sensors. Sensitivity to biological agents is conferred by functionalising individual sensing regions with different antibodies selected against numerous targets of interest. Antigen binding to the surface-immobilised antibodies results in localised changes in refractive index;upon laser-induced interrogation of the sensing region via optical fibres, these antibody-antigen interactions manifest as increases in wavelength of light reflected from the sensor chip. Real-time detection of multiple biological agents including bacterial cells/spores, viruses and toxins has been demonstrated. Further improvements to sensor performance including physical and chemical methods are also investigated. This multi-analyte capability highlights the potential use of this sensing technology in applications ranging from bio-hazard detection for defence purposes to point-of-care clinical diagnostics.

关键词： bio-warfare agents biosensor optical sensor multi-analyte detection

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Dry etching and surface passivation techniques for type-ii InAs/GaSb superlattice infrared detectors

Dry etching and surface passivation techniques for type-II I...

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conference on Optics and Photon for Counterterrorism and Crime Fighting VI/optical Materials in Defence Systems technology Vii

作者： Tan, Siew Li Goh, Yu Ling Das, Sankha Dip Zhang, Shiyong Tan, Chee Hing David, John P. R. Gautam, Nutan Kim, Hasul Plis, Elena Krishna, Sanjay Univ Sheffield Dept Elect & Elect Engn Mappin BldgMappin St Sheffield S1 3JD S Yorkshire England Univ New Mexico Dept Elect & Comp Engn Ctr High Technol Mat Albuquerque NM 87106 USA

ISBN: (纸本)9780819483560

Two of the key challenges in the realisation of focal plane arrays based on type-ii InAs/GaSb superlattices (T2SL) are the difficulty in achieving a good sidewall profile and the increased dominance of surface leakage current as the device dimensions shrink. We report the electrical and morphological results of test pixels for mid-wave infrared T2SL photodiodes etched using a Cl-2/Ar based inductively coupled plasma reactive ion etching (ICP-RIE) process and passivated using SU-8 epoxy photoresist. The etch rate and sidewall surface morphology of GaSb, InAs, and InAs/GaSb T2SL materials are compared after dry etching under the same conditions, leading to the determination of an optimal etch rate. The effect of surface treatment using selected wet chemical etchants before passivation on the surface leakage current is presented. Limitations of the dry etching recipe and further improvement of the sidewall verticality and smoothness are also discussed. Good sidewall profiles and bulk-limited dark currents are demonstrated for T2SL photodiodes etched to depths between 1.5 and 3.5 mu m with a pitch size down to 12 mu m.

关键词： type ii InAs/GaSb superlattice infrared photodetectors dry etching reactive ion etching passivation

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Standoff detection at the DLR laser test range applying laser-induced breakdown spectroscopy

Standoff detection at the DLR laser test range applying lase...

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conference on Optics and Photon for Counterterrorism and Crime Fighting VI/optical Materials in Defence Systems technology Vii

作者： Duschek, Frank Pargmann, Carsten Gruenewald, Karin Handke, Juergen DLR German Aerosp Ctr Inst Tech Phys D-74239 Langer Grund Hardthausen Germany

ISBN: (纸本)9780819483560

The DLR laser test range at Lampoldshausen allows for optical measurements under daylight conditions at distances up to 130 m. This infrastructure is very suitable for the development of standoff detection systems for biological, chemical and explosive hazardous substances. In a first step, laser-induced breakdown spectroscopy (LIBS) has been introduced to this test site. A basic LIBS setup and first LIBS spectra of selected samples are presented. A Nd:YAG laser beam was focused by a Cassegrain type telescope onto different samples at distances exceeding 50 m. The light of the generated plasma plume was collected by a Newtonian telescope and analyzed by a gated broadband CCD-spectrometer system. The Nd:YAG laser yields pulse energies up to 800 mJ at a wavelength of 1064 nm and a pulse width of 8 ns. Optionally the second and third harmonics can be extracted. LIBS spectra from 10 nm layers of gold on a silicon wafer were recorded. In addition, LIBS spectra from black powder were measured and compared to the spectrum of potassium nitrate, which is a main component of black powder and shows very characteristic emission lines. LIBS spectra of the above samples have also been acquired with an excitation laser wavelength in the eye-safe region. Recorded spectra are measured as a function of the laser wavelength, pulse energy and distance to the target substance.

关键词： Standoff detection laser-induced breakdown spectroscopy (LIBS)

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detection of concealed substances in sealed opaque plastic and coloured glass containers using SORS

Detection of concealed substances in sealed opaque plastic a...

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conference on Optics and Photon for Counterterrorism and Crime Fighting VI/optical Materials in Defence Systems technology Vii

作者： Bloomfield, Matthew Loeffen, Paul W. Matousek, Pavel Cobalt Light Syst Ltd Oxford OX11 0QR England

ISBN: (纸本)9780819483560

The reliable detection of concealed substances in sealed opaque plastic and coloured glass containers, with low false-alarm rate, is a problem in numerous areas of security. For example, in aviation security, there is no reliable methodology for alarm resolution of substances with high chemical specificity unless the substances are in optically transparent containers. We present a recently developed method called Spatially Offset Raman Spectroscopy (SORS) which enables the discrimination of the Raman spectrum of the content substance from the Raman spectrum of the container material with no prior knowledge of either, thereby allowing unambiguous identification of the container contents. The method is effective with coloured plastic containers that are several millimetres thick and which are not see-through to the eye and also for coloured glass bottles. Such cases do not typically yield to conventional backscatter Raman spectroscopy (or have poor false-alarm rates) since the content signal is often overwhelmed by the signal from the container, which may in addition have a strong interfering fluorescence background. SORS measurement can be performed in a few seconds by shining a laser light onto the container and then measuring the Raman signal at the excitation point but also at one or more offset positions. Each measurement has different relative orthogonal contributions from the container and contents Raman spectra, so that, with no prior knowledge, the pure spectra of both the container and contents can be extracted - either by scaled subtraction or via multivariate statistical methods. The content spectrum can then be compared to a reference library of pure materials to give a threat evaluation with a confidence level not compromised by interfering signals originating from the container wall. In this paper, we describe the methods and their optimization, and characterize their performance in practical screening applications. The study shows that there is frequen

关键词： SORS Raman security spectroscopy containers

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Image Processing Algorithm for Integrated Sense And Avoid Systems

Image Processing Algorithm for Integrated Sense And Avoid Sy...

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conference on Unmanned/Unattended Sensors and Sensor Networks Vii

作者： Forlenza, Lidia Fasano, Giancarmine Accardo, Domenico Moccia, Antonio Rispoli, Attilio Univ Naples Federico II Dept Aerosp Engn DIAS I-80125 Naples NA Italy Italian Aerosp Res Ctr CIRA I-81043 Capua CE Italy

ISBN: (纸本)9780819483515

To allow Unmanned Aircraft Systems (UAS) accessing National Airspace System (NAS) "Equivalent levels of safety" to the ones of human vision must be guaranteed. Therefore, an appropriate "Sense and Avoid" technology must be developed that is capable of detecting, tracking, and avoiding obstacles. The Department of Aerospace Engineering at University of Naples has been involved in a project funded by the Italian Aerospace Research Centre (CIRA) for the realization of a prototypical "Obstacle detection & identification" (ODID) System. It is installed onboard a Very Light Aircraft (VLA) and it is characterized by a hierarchical sensor configuration in which the radar is the main sensor while EO cameras are the auxiliary ones in order to increase accuracy and data rate so that anti-collision requirements are fulfilled. This paper focuses on the Image Processing algorithm for the panchromatic camera. Among the several techniques listed in literature the edge detection - labeling one resulted as the best compromise in terms of computational load, detection range, false alarm rate, miss detection rate and adaptability at different background luminosity conditions. Moreover it has been customized in order to allow for reliable operation in a wide range of flight and luminance configurations and it has been tested and run on a sequence of real images taken during flight tests. At the end, a table that summarizes those results is presented. Indeed, the output tracking measurements accuracy increases by an order of magnitude with respect to standalone radar one.

关键词： Detect Sense and Avoid (DS&A) Unmanned Aerial Systems (UAS) Unmanned Aerial Vehicles (UAV) Multisensor data fusion Airborne Image Tracking Real-Time Image Processing Autonomous Anti Collision Systems

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Compact liquid crystal waveguide based Fourier transform spectrometer for In-Situ and remote gas and chemical sensing

Compact liquid crystal waveguide based Fourier transform spe...

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2009 International conference on optical Instruments and technology, OIT'09

作者： Chao, Tien-Hsin Davis, Scott R. Rommel, Scott D. Farca, George Luey, Ben Martin, Alan Anderson, Michael H. Jet Propulsion Laboratory 4800 Oak Grove Drive Pasadena CA 91109 United States Vescent Photonics Inc. 4865 E. 41st Ave Denver CO 80216 United States

ISBN: (纸本)9780819478948

Jet Propulsion Lab and Vescent Photonics Inc. are jointly developing an innovative ultra-compact (volume 3), ultra-low power (-3 Watt-hours per measurement and zero power consumption when not measuring), completely non-mechanical electro-optic Fourier transform spectrometers (EO-FTS) that will be suitable for a variety of remote-platform, in-situ measurements. This EO-FTS consists of: i) a novel electro-evanescent waveguide architecture as the solid-state time delay device whose optical path difference (OPD) can be precisely varied utilizing voltage control, ii) a photodetector diode, and iii) an external light/sample collecting devices tailored for either in-situ gas and/or rock sample analysis or for remote atmospheric gas analysis. These devices are made possible by a novel electro-evanescent waveguide architecture, enabling "chip-scale" EO-FTS sensors. The potential performance of these EO-FTS sensors include: i) a spectral range throughout 0.4-5 μm (25000 - 2000 cm-1), ii) high-resolution (Δλ, ≤ 0.1 nm), iii) high-speed (

关键词： Fourier transform infrared spectroscopy

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Type-ii photodiode and APD for detection in the 2-2.5 μm wavelength range

Type-II photodiode and APD for detection in the 2-2.5 μm wa...

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22nd Annual Meeting of the IEEE-Photonics-Society

作者： Goh, Y. L. Ong, D. S. G. Zhang, S. Ng, J. S. Tan, C. H. David, J. P. R. Univ Sheffield Dept Elect & Elect Engn Sheffield S1 3JD S Yorkshire England

ISBN: (纸本)9781424436804

Many applications such as imaging, chemical sensing and medical diagnostics would benefit from the ability to detect weak optical signals in the 2- 2.5 mu m wavelength range. Detectors that ca operate within this optical spectrum are also used to detect the distribution of aerosols, clouds, CO(2), O(3) and CH(4) for LIDAR remote sensing. Narrow band gap materials such as strained InGaAs cannot be readily used for these applications due to their high dark currents at ambient. Mercury Cadmium Telluride (MCT)s would also require extensive cooling which increased cost and size of the detection system.

关键词： Semiconductor alloys

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