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检索条件"任意字段=Conference on Optical Materials and Biomaterials in Security and Defence Systems Technology XV"

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Preparation, Linear and NLO properties of DNA-CTMA-SBE complexes

Preparation, Linear and NLO properties of DNA-CTMA-SBE compl...

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conference on Optics and Photonics for Counterterrorism, Crime Fighting and defence IX;and optical materials and biomaterials in security and defence systems technology X

作者： Manea, Ana-Maria Rau, Ileana Kajzar, Francois Meghea, Aurelia Univ Politehn Bucuresti Fac Appl Chem & Mat Sci Bucharest 011061 Romania

ISBN: (纸本)9780819497703

Synthesis of deoxyribonucleic acid (DNA) - was cetyltrimethylammonium (CTMA) - sea buckthorn extract (SBE) at different concentrations is decribed. The complexes were processed into good optical quality thin films by spin coating on different substrates such as: glass, silica and ITO covered glass substrates. SBE contains many bioactive substances that can be used in the treatment of several diseases, such as cardiovascular disease, cancer, and acute mountain sickness. The obtained thin films were characterized for their spectroscopic, fluorescent, linear and nonlinear optical properties as function of SBE concentration. The third-order nonlinear optical (NLO) properties of thin films were determined by the optical third-harmonic generation technique at 1 064.2 nm fundamental wavelength.

关键词： deoxyribonucleic acid (DNA) CTMA surfactant sea buckthorn extract (SBE) DNA-CTMA-SBE complex third harmonic generation third-order nonlinear optical properties third-order NLO susceptibility

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Detection of bottled explosives by near infrared

Detection of bottled explosives by near infrared

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conference on Optics and Photonics for Counterterrorism, Crime Fighting and defence IX;and optical materials and biomaterials in security and defence systems technology X

作者： Itozaki, Hideo Sato-Akaba, Hideo Osaka Univ Grad Sch Engn Sci Toyonaka Osaka 5608531 Japan

ISBN: (纸本)9780819497703

Bottled liquids are not allowed through the security gate in the airport, because liquid explosives have been used by the terrorists. However, passengers have a lot of trouble if they cannot bring their own bottles. For example, a mother would like to carry her own milk in the airplane for her baby. Therefore the detection technology of liquid explosives should be developed as soon as possible. This paper shows that near infrared spectroscopy can detect bottled explosives quickly. The transmission method cannot deal with milk in the sense of liquid inspection. Here we examined the reflection method to the test of milk. The inspection method with light cannot make test for the metal can. We also use ultrasonic method to check metal can simultaneously in order to expand test targets.

关键词： bottled liquid scanner near infrared liquid explosives airport security milk reflectance transmittance

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Ammonia detection using optical reflectance from porous silicon formed by metal-assisted chemical etching

Ammonia detection using optical reflectance from porous sili...

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conference on Optics and Photonics for Counterterrorism, Crime Fighting and defence IX;and optical materials and biomaterials in security and defence systems technology X

作者： Iatsunskyi, Igor Smyntyna, Valentyn Pavlenko, Mykolai Kanevska, Olga Kirik, Yuliia Myndrul, Valeryi Odessa II Mechnikov Natl Univ Dept Expt Phys UA-65023 Odessa Ukraine

ISBN: (纸本)9780819497703

An impact of morphology on reflectance of porous silicon was investigated. Depending on the metal-assisted chemical etching conditions the macro-micro structures could be formed. The reflectance properties of various porous silicon structures after ammonia adsorption were investigated. It was shown that increasing of ammonia concentration in the measurement chamber leads to an increase of the reflectance. The most sensitive structures for ammonia detection are porous silicon having approximately size of pores - 10-15 mu m. A fast response of porous silicon on the adsorption of ammonia molecules may be used for development of new sensors.

关键词： porous silicon adsorption reflectance metal-assisted chemical etching ammonia

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WPSS: Watching people security services

WPSS: Watching people security services

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conference on Optics and Photonics for Counterterrorism, Crime Fighting and defence IX;and optical materials and biomaterials in security and defence systems technology X

作者： Bouma, Henri Baan, Jan Borsboom, Sander van Zon, Kasper Luo, Xinghan Loke, Ben Stoeller, Bram van Kuilenburg, Hans Dijk, Judith TNO Oude Waalsdorperweg 63 NL-2597 AK The Hague Netherlands Cameramanager Com NL-1101 CB Amsterdam Netherlands VicarVision NL-1015 AH Amsterdam Netherlands Noldus Informat Technol NL-6709 PA Wageningen Netherlands Eagle Vis Naarden Netherlands

ISBN: (纸本)9780819497703

To improve security, the number of surveillance cameras is rapidly increasing. However, the number of human operators remains limited and only a selection of the video streams are observed. Intelligent software services can help to find people quickly, evaluate their behavior and show the most relevant and deviant patterns. We present a software platform that contributes to the retrieval and observation of humans and to the analysis of their behavior. The platform consists of mono- and stereo-camera tracking, re-identification, behavioral feature computation, track analysis, behavior interpretation and visualization. This system is demonstrated in a busy shopping mall with multiple cameras and different lighting conditions.

关键词： Surveillance CCTV security tracking behavior analysis threat biometry

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Nanovectors as a complex solution for optical securing

Nanovectors as a complex solution for optical securing

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conference on Optics and Photonics for Counterterrorism, Crime Fighting and defence IX;and optical materials and biomaterials in security and defence systems technology X

作者： Bednarkiewicz, A. Strek, W. Hreniak, D. Nanovectors Sp Zoo PL-50369 Wroclaw Poland

ISBN: (纸本)9780819497703

Nanovectors technology is a comprehensive solution, which comprises unique luminescent nanolabels, dedicated equipment for reading of the same and verification algorithms - all devoted for anti-forgery protection of valuable objects. Nanovectors themselves have a complex and unique luminescence spectrum fingerprint resulting from the selection of their composition, type and substrates, which make any attempt to fake the spectral information practically impossible. Nanovectors constitute a special code enabling correct identification only for specified measurement conditions. Moreover, nanovectors may be used for marking of a wide range of products such as documents, ID cards, access cards and employee cards, spare parts, elements of packaging, liquids, greases etc. Either entire volume of objects during their production process, pressing in a specified location of an object after production or unique printing on the object's surface may be conveniently employed. Nanovectors are most often manufactured as invisible security features and, therefore, special tools are necessary to detect their presence. This work was focused on experimental verification of reproducibility of Nanovectors reading and theoretical estimation of maximal number of distinguishable optical codes, which confirmed the ability to unequivocally design thousands of such spectral fingerprints.

关键词： lanthanide doped nanoparticles spectral fingerprint multicolor

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Spatially offset Raman spectroscopy for explosives detection through difficult (opaque) containers

Spatially offset Raman spectroscopy for explosives detection...

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conference on Optics and Photonics for Counterterrorism, Crime Fighting and defence IX;and optical materials and biomaterials in security and defence systems technology X

作者： Maskall, Guy T. Bonthron, Stuart Crawford, David Cobalt Light Syst Ltd Abingdon OX14 4SD Oxon England

ISBN: (纸本)9780819497703

With the continuing threat to aviation security from homemade explosive devices, the restrictions on taking a volume of liquid greater than 100 ml onto an aircraft remain in place. From January 2014, these restrictions will gradually be reduced via a phased implementation of technological screening of Liquids, Aerosols and Gels (LAGs). Raman spectroscopy offers a highly sensitive, and specific, technique for the detection and identification of chemicals. Spatially Offset Raman Spectroscopy (SORS), in particular, offers significant advantages over conventional Raman spectroscopy for detecting and recognizing contents within optically challenging (Raman active) containers. Containers vary enormously in their composition;glass type, plastic type, thickness, reflectance, and pigmentation are all variable and cause an infinite range of absorbances, fluorescence backgrounds, Rayleigh backscattered laser light, and container Raman bands. In this paper we show that the data processing chain for Cobalt Light systems' INSIGHT100 bottlescanner is robust to such variability. We discuss issues of model selection for the detection stage and demonstrate an overall detection rate across a wide range of threats and containers of 97% with an associated false alarm rate of 0.1% or lower.

关键词： Raman SORS Spectroscopy Explosives detection Linear discriminant Feature extraction Aviation security Bottled Liquid Scanner LEDS

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Gold nanoparticles as optical limiting materials against cw lasers

Gold nanoparticles as optical limiting materials against cw ...

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conference on Optics and Photonics for Counterterrorism, Crime Fighting and defence IX;and optical materials and biomaterials in security and defence systems technology X

作者： Frare, Maria Chiara Signorini, Raffaella Weber, Verena Bozio, Renato Univ Padua Dept Chem Sci Via Marzolo 1 I-35131 Padua Italy Univ Padua INSTM Res Unit I-35131 Padua Italy

ISBN: (纸本)9780819497703

The goal of this work is to study the optical limiting properties of gold nanoparticles colloidal suspensions in organic solvent and to make a comparison with nanoparticles embedded in a polymeric matrix. The idea is to realize a solid state protection device based on gold nanoparticles (AuNPs) against cw lasers. This is desirable because polymers are usually cheap, flexible, and mechanically robust and temporally stable. In particular we use polycarbonate, a common polymer used to produce high quality optical lenses with superior mechanical properties. Thermally induced nonlinear optical properties of AuNPs, characterized by a surface plasmon resonance with a peak at about 520 nm where the human eye is most sensitive, have been reported for solution samples. The z-scan analysis performed on AuNPs in organic solvent confirms the presence of a nonlinear absorption coefficient comparable with literature for water colloids. We have investigated the optical limiting behavior of AuNPs doped thin film under cw illumination at 488 nm and their temporal response. A critical parameter in assessing the effectiveness of the optical limiting action is the time response of the material at varying input powers. It gives us information on the transmitted irradiance in a 300 milliseconds time interval, corresponding to the blinking time of the human eye, therefore on the total fluence reaching the retina. Finally we also report a characterization of the optical limiting action of film at 488, 514 and 647 nm.

关键词： gold nanoparticles optical limiting polycarbonate cw laser

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Electro-optic properties of novel azobenzene polymers

Electro-optic properties of novel azobenzene polymers

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conference on Optics and Photonics for Counterterrorism, Crime Fighting and defence IX;and optical materials and biomaterials in security and defence systems technology X

作者： Krupka, O. Derkowska, B. Kajzar, F. Smokal, V. Studzinsky, S. Davidenko, N. Kyiv Taras Shevchenko Natl Univ 60 Volodymyrska UA-01033 Kiev Ukraine N Copernicus Univ Inst Phys PL-87100 Torun Poland Angers Univ F-49045 Angers France Univ Politehn Bucuresti Fac Appl Chem & Mat Sci Bucharest 011601 Romania

ISBN: (纸本)9780819497703

Polymers containing azobenzene dyes or azobenzene lateral groups are of special interest for their application as optically active media, particularly, as polarization sensitive media for such applications: optical data storage, surface nanostructuration, photoswitching, alignment of liquid crystals, active optical elements etc. An intensive research was carried out previous years on synthesizis and investigation of the second order nonlinear optical response of azobenzene/polymer systems. The desirable properties of these materials are attributed to the highly efficient photoinduced trans-cis and vice versa isomerization of azobenzene moieties. This transformation is connected with the volume change of molecules, followed by an increase of their rotational mobility. The trans-cis izomerization process is exploited also in all optical poling of polymers and plays an important role in optical depoling. Generally these phenomena are induced by light with frequencies corresponding to one-photon absorption. They are possible also by multiphoton absorptions. In this paper we report the synthesis of side chain methacrylic polymers functionalized with azobenzene chromophores. A reversible change of thin film absorption is observed when illuminating it with monochromatic, linearly polarized light under the applied external DC field. The amount of change depends on the angle between the light polarization and the DC electric field direction.

关键词： Azopolymers Disperse Red 1 (DR1) photoisomers electro-optical effect

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Photoacoustic detection by means of a differential double resonator cell applied to security and defence

Photoacoustic detection by means of a differential double re...

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conference on Optics and Photonics for Counterterrorism, Crime Fighting and defence IX;and optical materials and biomaterials in security and defence systems technology X

作者： Vallespi, Arturo Slezak, Veronica Peuriot, Alejandro Gonzalez, Francisco Pereyra, Andrea Santiago, Guillermo CEILAP CITEDEF San Juan Bautista La Salle 4397 B1603ALO Villa Martelli Bs As Argentina Univ Buenos Aires Lab Laser Fac Ingn RA-1063 Buenos Aires DF Argentina

ISBN: (纸本)9780819497703

The purpose of this article is to present a sensitive optical system for immediate detection of traces of ammonia by means of photoacoustic spectroscopy and study some properties with both a pulsed CO2 laser (TEA) and a CW CO2 laser. The laser beam is aimed to an innovative dual resonator differential cell, which lowest resonant frequency is the first longitudinal mode at 1205 Hz, filled with a flowing NH3 and N-2 mixture. The chosen cell's material is polypropylene, suitable for reducing the effects of adsorption. As a result of physical adsorption-desorption studies, based on a pulsed CO2 laser, 5 % PA signal decay from an enclosed sample of 248 ppmV of NH3 in N-2 is recorded within 1 hour. The setup for CW CO2 laser excitation takes advantage of a differential microphone connected to both resonators by picking up out of phase signals. For this purpose, the beam is modulated at the cell's resonance by means of a chopper with a special blade which allows both reflection and transmission of the laser beam;the direct and the reflected beam are alternatively aimed to one resonator and the other. The measurements show that for the double resonator configuration a signal increase is achieved, as expected from the study of the sensitivity of both resonators separately, which have been previously characterized. Measurements with this system indicate a limit of detection of 13ppbV at the 10P(32) laser line, deduced from one standard deviation of the PA signal from pure N-2.

关键词： Photoacoustics ammonia detection limit adsorption signal to noise ratio

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Raman Spectroscopy for the detection of explosives and their precursors on clothing in fingerprint concentration: a reliable technique for security and counterterrorism issues.

Raman Spectroscopy for the detection of explosives and their...

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conference on Optics and Photonics for Counterterrorism, Crime Fighting and defence IX;and optical materials and biomaterials in security and defence systems technology X

作者： Almaviva, S. Botti, S. Cantarini, L. Palucci, A. Puiu, A. Schnuerer, F. Schweikert, W. Romolo, F. S. ENEA Diagnost & Metrol Lab UTAPRAD DIM I-00044 Frascati Italy

ISBN: (纸本)9780819497703

In this work we report the results of RS measurements on some common military explosives and some of the most common explosives precursors deposited on clothing fabrics, both synthetic and natural, such as polyester, leather and denim cotton at concentration comparable to those obtained from a single fingerprint. RS Spectra were obtained using an integrated portable Raman system equipped with an optical microscope, focusing the light of a solid state GaAlAs laser emitting at 785 nm. A maximum exposure time of 10 s was used, focusing the beam in a 45 mu m diameter spot on the sample. The substances were deposited starting from commercial solutions with a Micropipetting Nano-Plotter, ideal for generating high-quality spots by non-contact dispensing of sub-nanoliter volumes of liquids, in order to simulate a homogeneous stain on the fabric surface. Images acquired with a Confocal Laser Scanning Microscope provided further details of the deposition process showing single particles of micrometric volume trapped or deposited on the underlying tissues. The spectral features of each substance was clearly identified and discriminated from those belonging to the substrate fabric or from the surrounding fluorescence. Our results show that the application of RS using a microscope-based apparatus can provide interpretable Raman spectra in a fast, in-situ analysis, directly from explosive particles of some mu m(3) as the ones that it could be found in a single fingerprint, despite the contribution of the substrate, leaving the sample completely unaltered for further, more specific and propaedeutic laboratory analysis. The same approach can be envisaged for the detection of other illicit substances like drugs.

关键词： Raman spectroscopy explosives detection laser spectroscopy nitro-based explosives

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