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

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optical materials and biomaterials in security and defence systems technology xvi

Optical Materials and Biomaterials in Security and Defence S...

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optical materials and biomaterials in security and defence systems technology xvi 2019

The proceedings contain 3 papers. The topic discussed include: optical materials for printed interconnects and sensors;new type Cu(N3)2 metal-azides for laser initiation;and optical limiting properties of polymer-dye ... 详细信息

ISBN: (纸本)9781510630338

关键词： optical materials

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optical materials for Printed Interconnects and Sensors 16

Optical Materials for Printed Interconnects and Sensors

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conference on optical materials and biomaterials in security and defence systems technology xvi

作者： Aga, R. S. Ouchen, F. Kreit, E. B. Bartsch, C. M. Heckman, E. M. KBR 2601 Mission Point BlvdSuite 300 Dayton OH 45431 USA US Air Force Res Lab Sensors Directorate 2241 Avionics Circle Wright Patterson AFB OH 45433 USA

ISBN: (数字)9781510630345

ISBN: (纸本)9781510630345

This work explores additive manufacturing technology to fabricate hybrid circuits comprising of optical and electronic materials as photonic and electrical interconnects, respectively. Several polymeric optical materials have been investigated (including SU8, PDMS, UV15 and Norland adhesives) as waveguides directly printed on commercial circuit boards such as FR4 and Rogers TC600. An optical waveguide printed over RF (radio frequency) transmission lines and surface mount electronic components is demonstrated. As an application, the waveguide is used as an alternative to traditional electrical interconnects to control an RF switch for routing an RF signal from a single source to different locations. This work also investigates the feasibility of printed polymeric waveguides as a sensing platform for monitoring humidity and temperature changes in electronic circuits. Results show that the SU8 waveguide responds significantly to change in temperature and humidity and the response is appropriate for logistics applications such as cold chain supply.

关键词： additive manufacturing interconnects electronic integration printed electronics optical sensor

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optical limiting properties of polymer-dye nanohybrids: a comparison between polylactide and PMMA hosts 16

Optical limiting properties of polymer-dye nanohybrids: a co...

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conference on optical materials and biomaterials in security and defence systems technology xvi

作者： Muller, O. Hege, C. Guerchoux, M. Dandois, M. Trendel, P. Merlat, L. French German Res Inst St Louis ISL Lab Radiat Interact Matter 5 Rue Gen Cassagnou F-68301 St Louis France Univ Nottingham Fac Engn Dept Chem & Environm Engn Nottingham NG7 2RD England

ISBN: (数字)9781510630345

ISBN: (纸本)9781510630345

The widespread usage of harmful pulsed laser sources emitting brief but intense radiations implies to search for appropriate and convenient forms of protection. Nonlinear optical nanomaterials can serve this purpose when properly embedded in a solid medium, resulting in nanohybrid passive optical limiting filters. This work focuses on the optical limiting behavior of polymer-dye nonlinear nanohybrids, for which we combined azophloxine, a red azo-dye, with two polymer hosts, namely PMMA and polylactide (PLA). Transmittance measurements in the nonlinear regime were performed at the wavelength of 1064 nm with nanosecond pulses at a low pulse repetition rate. The nonlinear optical properties resulting from energy dependent transmittance assessments reveal that the dye concentration is of major relevance regarding the PMMA nanohybrids, and to a lesser extend for the PLA based systems. The PLA synthesis concept described in this study offers an easy way to directly attach the dye covalently to the polymer chain. The originality and novelty of this synthesis technique is to be pointed out since it has never been mentioned elsewhere to date. For the various types of nanohybrids investigated, significant differences in the optical limiting response were observed. A molecular model claiming for the dye aggregation in the PMMA nanohybrids is discussed. Two different absorption regimes responsible for the optical limiting action have been identified to be reverse saturable - excited state absorption on the one hand and multi-photons absorption on the other hand.

关键词： dyes nanohybrids laser protection optical limiting polylactide RSA MPA aggregation

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Preparation and characterization of novel nanosized hybrid materials and their nonlinear optical properties 10

Preparation and characterization of novel nanosized hybrid m...

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

作者： Dengler, Stefanie Hege, Cordula Eberle, Bernd Fraunhofer Inst Optron Syst Technol & Image Explo Dept Optron D-76275 Ettlingen Germany

ISBN: (纸本)9781628413168

We evaluate multi walled carbon nanotubes decorated with gold or silver nanoparticles suspended in water regarding their nonlinear attenuation characteristics for nanosecond laser pulses. The results are compared to pure multi walled carbon nanotubes. A Q-switched Nd:YAG laser working at a wavelength of 1064 or 532 nm, with a pulse width of 3 ns is used to characterize their optical limiting behaviour by fluence dependent transmittance measurements. Our experiments show that the properties of the hybrid materials, measured at both wavelengths, could be improved compared to plain multi walled carbon nanotubes.

关键词： optical limiting broadband laser protection nanoparticles nonlinear optical processes nonlinear scattering and absorption hybrid materials carbon nanotubes

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Handheld detector using NIR for bottled liquid explosives 10

Handheld detector using NIR for bottled liquid explosives

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

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

ISBN: (纸本)9781628413168

A handheld bottle checker for detection of liquid explosives is developed using near infrared technology. In order to make it compact, a LED light was used as a light source and a novel circuit board was developed for the device control instead of using a PC. This enables low power consumption and this handheld detector can be powered by a Li-ion battery without an AC power supply. This checker works well to analyze liquids, even using limited bandwidth of NIR by the LED. It is expected that it can be applied not only to airport security but also to wider applications because of its compactness and portability.

关键词： liquid explosives handheld near infrared bottled liquid airport security LED FPGA compact

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Usage of cornea and sclera back reflected images captured in security cameras for forensic and card games applications

Usage of cornea and sclera back reflected images captured in...

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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： Zalevsky, Zeev Ilovitsh, Asaf Beiderman, Yevgeny Bar Ilan Univ Fac Engn IL-52900 Ramat Gan Israel

ISBN: (纸本)9780819497703

We present an approach allowing seeing objects that are hidden and that are not positioned in direct line of sight with security inspection cameras. The approach is based on inspecting the back reflections obtained from the cornea and the sclera of the eyes of people attending the inspected scene and which are positioned in front of the hidden objects we aim to image after performing proper calibration with point light source (e.g. a LED). The scene can be a forensic scene or for instance a casino in which the application is to see the cards of poker players seating in front of you.

关键词： Cornea and sclera back reflection forensic applications card games applications security cameras

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optical Sensing: recognition elements and devices

Optical Sensing: recognition elements and devices

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conference on optical materials and biomaterials in security and defence systems technology IX

作者： Gauglitz, Guenter Univ Tubingen Inst Phys & Theoret Chem D-72076 Tubingen Germany

ISBN: (纸本)9780819492869

The requirements in chemical and biochemical sensing with respect to recognition elements, avoiding non-specific interactions, and high loading of the surface for detection of low concentrations as well as optimized detection systems are discussed. Among the many detection principles the optical techniques are classified. Methods using labeled compounds like Total Internal Reflection Fluorescence (TIRF) and direct optical methods like micro reflectometry or refractometry are discussed in comparison. Reflectometric Interference Spectroscopy (RIfS) is presented as a robust simple method for biosensing. As applications, trace analysis of endocrine disruptors in water, hormones in food, detection of viruses and bacteria in food and clinical diagnostics are discussed.

关键词： Biosensors Recognition elements surface characterization TIRF RIfS direct optical detection environment healthcare

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Influence of various solvents on the nonlinear optical properties of metallophthalocyanines (MPcs) 11

Influence of various solvents on the nonlinear optical prope...

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

作者： Derkowska-Zielinska, Beata Nicolaus Copernicus Univ Inst Phys Fac Phys Astron & Informat Grudziadzka 5 PL-87100 Torun Poland

ISBN: (纸本)9781628418620

The aim of this work was to learn how the influence of various solvents correlates with nonlinear optical properties of metallophthalocyanines (MPcs). The method, which was used to measure nonlinear optical properties, was degenerate four wave mixing (DFWM). We used ethanol, chloroform and dimethyl sulfoxide as solvent of metallophthalocyanines. The absorption spectra of MPcs solutions present a narrow Q-band in the visible region and a relatively wide B-band in the near ultraviolet. In all cases we observed the solvatochromism effect. Nonlinear optical properties of MPcs solutions change with using different polarity of solvent in the following way: n(2) ((ZnPc)) < n(2 (CoPc)) < n(2 (CuPc)).

关键词： Metallophthalocyanines (MPcs) Nonlinear optical properties DFWM Nonlinear refractive index Solvent effect

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optical PROPERTIES OF POLYMETHACRYLATE WITH STYRYLQUINOLINE SIDE CHAINS 11

OPTICAL PROPERTIES OF POLYMETHACRYLATE WITH STYRYLQUINOLINE ...

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

作者： Derkowska-Zielinska, B. Figa, V. Krupka, O. Smokal, V. Nicolaus Copernicus Univ Inst Phys Fac Phys Astron & Informat Grudziadzka 5 PL-87100 Torun Poland Univ Palermo Dept Chem & Phys I-90128 Palermo Italy Taras Shevchenko Natl Univ Kyiv UA-01033 Kiev Ukraine

ISBN: (纸本)9781628418620

In this paper we report the synthesis of side chain methacrylic polymers functionalized with styrylquinoline fragments. The polymerization was carried out in dimethylformamide with azobisisobutyronitrile as initiator. The products of polymerization were characterized by H-1 NMR, DSC. A study on the energetics of modelling compounds has been performed by a synergetic use of both electrochemical and optical techniques. The results of photochemical activities of the corresponding polymers are presented.

关键词： Styrylquinolines photochromic materials methacrylic polymers

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A review of materials for spectral design coatings in signature management applications 10

A review of materials for spectral design coatings in signat...

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

作者： Andersson, Kent E. Akerlind, Christina Finnish Natl Def Univ Swedish Natl Def Coll Box 278 05 SE-11593 Stockholm Sweden Swedish Def Res Agcy SE-58111 Linkoping Sweden

ISBN: (纸本)9781628413168

The current focus in Swedish policy towards national security and high-end technical systems, together with a rapid development in multispectral sensor technology, adds to the utility of developing advanced materials for spectral design in signature management applications. A literature study was performed probing research databases for advancements. Qualitative text analysis was performed using a six-indicator instrument: spectrally selective reflectance;low gloss;low degree of polarization;low infrared emissivity;non-destructive properties in radar and in general controllability of optical properties. Trends are identified and the most interesting materials and coating designs are presented with relevant performance metrics. They are sorted into categories in the order of increasing complexity: pigments and paints, one-dimensional structures, multidimensional structures (including photonic crystals), and lastly biomimic and metamaterials. The military utility of the coatings is assessed qualitatively. The need for developing a framework for assessing the military utility of incrementally increasing the performance of spectrally selective coatings is identified.

关键词： Spectral Design Signature Management Camouflage Military Utility Military-technology Coating

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