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

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materials for near-IR light modulation 13

Materials for near-IR light modulation

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

作者： Whyte, Alexander M. Robertson, Neil Univ Edinburgh EaStCHEM Sch Chem Kings Bldg Edinburgh EH9 3FJ Midlothian Scotland

ISBN: (纸本)9781510603936

The work reported outlines the synthesis, film formation and application of NIR-absorbing metal dithiolene and metal diimine molecules suitable for film formation with varying ligands and central metals. Formation of an electroactive film on conducting glass or mesoporous TiO2 support can be achieved through electropolymerisation, electrodeposition, spin/drop coating or chemical attachment. In this context, we will outline the synthesis, characterisation and properties of a new family of NIR-absorbing aromatic metal diimine complexes. These complexes are shown to give rise to planar, delocalised structures with small HOMO-LUMO gaps, through the use of extended non-innocent ligands o-semibenzoquinonediimines. Herein we report the synthesis of a series of metal diimine complexes, modified to extend the electronic conjugation and shift the intense low-energy absorption from the visible to the NIR region. This study extends the range of available NIR absorping metal-complex chromophores and opens up new possibilities for wavelength tuning and application.

关键词： Near-IR electrochromism diimine complex dithiolene complex

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Frequency analysis of the new prototype of the security window sensor 13

Frequency analysis of the new prototype of the security wind...

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

作者： Nedoma, Jan Fajkus, Marcel Novak, Martin Bednarek, Lukas Vasinek, Vladimir VSB Tech Univ Ostrava Fac Elect Engn & Comp Sci Dept Telecommun 17 Listopadu 15 Ostrava 70833 Czech Republic

ISBN: (纸本)9781510603936

The paper describes the use of fiber-optic interferometer as a security sensor, which was built in a prototype of a plastic window. Its primary function is detecting the vibration and acoustic impulses, which affect the transparent glass part of the window prototype. The presented results are focused on the analysis of the frequency characteristic of the created prototype to verify of the sensitivity of the sensor. The knowledge of the frequency characteristic of the proposed window sensor is necessary due to the correct interpretation of the measured data. The interferometer is a Mach-Zehnder type and operates with an optical fibers G.652.D. As a radiation source, we used DFB laser with the wavelength of 1550 nm. The input optical power is 1 mW. optical signal was detected by PbSe photodetector. The generator of the harmonic signal with fixed amplitude of the signal and digital sound level meter were used to the analysis of the frequency characteristic of the prototype. The analyzed frequency spectrum was in a range of 35 Hz to 8 kHz. The paper showed that this system is suitable for measurements of vibration impulses and acoustic waves in the audible range from 40 Hz up to 3 kHz.

关键词： Mach-Zehnder interferometer Fiber-optical sensor Acoustic Vibration Frequency range

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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...

引用

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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Influence of PDMS encapsulation on the sensitivity and frequency range of fiber-optic interferometer 13

Influence of PDMS encapsulation on the sensitivity and frequ...

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

作者： Nedoma, Jan Fajkus, Marcel Vasinek, Vladimir VSB Tech Univ Ostrava Fac Elect Engn & Comp Sci Dept Telecommun 17 Listopadu 15 Ostrava 70833 Czech Republic

ISBN: (纸本)9781510603936

Fiber-optic sensors are one of the dynamically developing areas of photonics and photonic applications. This group of sensors can also include fiber-optic interferometers which enable very sensitive sensing. They are entirely passive regarding power supply, and immune to electromagnetic interference. This type of sensor is dependent on the phase change. It mostly used in the field which requires high measurement accuracy. We can achieve a change of sensitivity in the order of 10-8. The fundamental problem of fiber-optic interferometry is a design and imposition (encapsulation) of the measuring arm and reference arm of the interferometer. Polydimethylsiloxane elastomer (PDMS) is one of the possibilities to encapsulation of the sensory arm. Two-component PDMS Sylgard 184 is used type. The article analyzes the effect of encapsulation into a PDMS of the measuring arm of the interferometer to frequency response and sensitivity of the Mach-Zehnder interferometer with the division of power in a ratio of 1: 1 (measuring arm and reference arm). Input power set to a reference value of 1 mW, this value was constant for all performed experimental measurements. The generator of a harmonic signal with fixed amplitude signal used for analysis of the frequency characteristic of the interferometer. The application written in LabView development environment, evaluated the amplitude-frequency spectra of the signal. Repeated test of assembled prototype verified the measured results.

关键词： Fiber optical sensors Interferometer Polydimethylsiloxane PDMS Encapsulation Frequency range

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