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

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optical AND PHOTOCHEMICAL PROPERTIES OF DIARYLETHYLENES 14

OPTICAL AND PHOTOCHEMICAL PROPERTIES OF DIARYLETHYLENES

引用

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

作者： Krupka, O. Smokal, V. Derkowska-Zielinska, B. Kolendo, A. Taras Shevchenko Natl Univ Kyiv 60 Volodymyrska UA-01033 Kiev Ukraine Nicolaus Copernicus Univ Torun Fac Phys Astron & Informat Inst Phys Grudziadzka 5 PL-87100 Torun Poland

ISBN: (纸本)9781510613454;9781510613447

In this study, the 2-(4-methacryloxystyryl) quinoline, 2-(4-methacryloxystyryl)-6-methoxyquinoline were synthesized. The polymers built from the free radical polymerization of methacrylic monomers incorporating the diarylethylenes sidegroup have been synthesized in dimethylformamide with azobisisobutyronitrile as initiator. The products of polymerization were characterized and evaluated by (HNMR)-H-1, UV spectroscopy. Thermal stability was characterized by DSC method. Their optical and photochemical properties as well as temperature dependence of the photoluminescence of diarylethylenes have been investigated.

关键词： Styrylquinoline photoisomerization photoluminescence radical polymerization

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Hybrid optical security system using photonic crystals and MEMS devices 14

Hybrid optical security system using photonic crystals and M...

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

作者： Ciosek, Jerzy Ostrowski, Roman Mil Univ Technol Inst Optoelect 2 Kaliskiego St PL-00908 Warsaw Poland

ISBN: (纸本)9781510613454;9781510613447

An important issue in security systems is that of selection of the appropriate detectors or sensors, whose sensitivity guarantees functional reliability whilst avoiding false alarms. Modern technology enables the optimization of sensor systems, tailored to specific risk factors. In optical security systems, one of the safety parameters considered is the spectral range in which the excitation signal is associated with a risk factor. Advanced safety systems should be designed taking into consideration the possible occurrence of, often multiple, complex risk factors, which can be identified individually. The hazards of concern in this work are chemical warfare agents and toxic industrial compounds present in the forms of gases and aerosols. The proposed sensor solution is a hybrid optical system consisting of a multi-spectral structure of photonic crystals associated with a MEMS (Micro Electro-Mechanical System) resonator. The crystallographic structures of carbon present in graphene rings and graphenecarbon nanotube nanocomposites have properties which make them desirable for use in detectors. The advantage of this system is a multi-spectral sensitivity at the same time as narrow-band selectivity for the identification of risk factors. It is possible to design a system optimized for detecting specified types of risk factor from very complex signals.

关键词： security systems multi-spectral detection graphene carbon nanostructures drop filters

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Monitoring of the structural loads of tunnels using a distributed optical system BOTDR 14

Monitoring of the structural loads of tunnels using a distri...

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

作者： Fajkus, Marcel Nedoma, Jan Mec, Pavel Novak, Martin Kajnar, Tomas Martinek, Radek Jaros, Jakub Hruby, David Vasinek, Vladimir VSB Tech Univ Ostrava Dept Telecommun Fac Elect Engn & Comp Sci Ostrava Czech Republic VSB Tech Univ Ostrava Dept Bldg Mat & Diagnost Struct Fac Civil Engn Ostrava Czech Republic VSB Tech Univ Ostrava Dept Cybernet & Biomed Engn Fac F Elect Engn & Comp Sci Ostrava Czech Republic

ISBN: (纸本)9781510613454;9781510613447

Authors of this article focused on the analysis of the use of distributed fiber-optic technology for security monitoring of structural loads of road and motorway tunnels. Authors focused on measurements of deformation utilizing Brillouin Time Domain Reflectometry (BOTDR). The principle is based on the measurement of the stimulated Brillouin scattering. The article describes the load of tunnel based on the real measurements made during the construction of the motorway tunnel in the Slovakia Republic in a time horizon of several months. Experiments were carried out with standard optical telecommunication cable with water-absorbing aramid yarns and jacketing of diameter 4.2 mm. The outcome of this article is an introductory analysis the use of fiber-optic technology for security monitoring of structural loads for road and motorway tunnels.

关键词： Brillouin time domain reflectometry structural monitoring tunnel structural loads

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Analysis of creating an innovative micro-lens made of polydimethylsiloxane polymer on the end of the optical fibers 14

Analysis of creating an innovative micro-lens made of polydi...

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

作者： Zboril, O. Cubik, J. Nedoma, J. Fajkus, M. Novak, M. Jargus, J. Stratil, T. Vasinek, V. VSB Tech Univ Ostrava Fac Elect Engn & Comp Sci Dept Telecommun 17 Listopadu 15 Ostrava 70833 Czech Republic

ISBN: (纸本)9781510613454;9781510613447

The article describes a method for fabrication of polymer optical micro-lenses using polydimethylsiloxane (PDMS) at the end of optical fibers. PDMS is an optically clear substance having a refractive index very similar to the optical fibers. Therefore it is an interesting material for optical purposes. PDMS is characterized by resistance to electromagnetic interference (EMI), enabling the use in electromagnetically noisy environments. These lenses could be used for example for the security applications. For the manufacture of the micro-lenses is used Sylgard silicone elastomer 184. When applied to the end of conventional optical fiber is cured by treatment at 100 degrees C +/- 5 degrees C. Authors performed a series of experimental measurements. The optical characteristics of the treated fibers compared with conventional fibers without micro- lenses. The fibers provided with optical lenses made of PDMS may be used for security applications, in the visible light communication (VLC) or as a microprobe.

关键词： Micro-lens Polydimethylsiloxane (PDMS) Electromagnetic Interference (EMI) security Applications Visible Light Communication (VLC) Microprobes

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Noninvasive encapsulated fiber-optic probes for interferometric measurement 14

Noninvasive encapsulated fiber-optic probes for interferomet...

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

作者： Zboril, O. Cubik, J. Kepak, S. Nedoma, J. Fajkus, M. Zavodny, P. Vasinek, V. VSB Tech Univ Ostrava Fac Elect Engn & Comp Sci Dept Telecommun 17 Listopadu 15 Ostrava 70833 Czech Republic

ISBN: (纸本)9781510613454;9781510613447

This article focuses on the sensitivity of encapsulated interferometric probes. These probes are used mainly for BioMed and security applications. Fiber-optic sensors are interesting for these applications, as they are resistant to electromagnetic interference (EMI) and that also do not affect the surrounding medical and security equipment. Using a loop of the optical fiber with is not a suitable for these measurements. The optical fiber should be fixed to one position, and should not significantly bend. For these reasons, the optical fiber is encapsulated. Furthermore, it is necessary that the encapsulated measuring probes were flexible, inert, water resistant and not toxic. Fiber-optic sensors shouldn't be magnetically active, so they can be used for example, in magnetic resonance environments (MR). Probes meeting these requirements can be widely used in health care and security applications. Encapsulation of interferometric measuring arm brings changes in susceptibility of measurements in comparison with the optical fiber without encapsulation. To evaluate the properties of the encapsulated probes, series of probes made from different materials for encapsulation was generated, using two types of optical fibers with various degrees of protection. Comparison of the sensitivity of different encapsulated probes was performed using a series of measurements at various frequencies. The measurement results are statistically compared in the article and commented. Given the desired properties polydimethylsiloxane (PDMS) polymer has been proven the most interesting encapsulating material for further research.

关键词： Fiber-optic probes Interferometry security Applications BioMed Applications Electromagnetic Interference (EMI) Polydimethylsiloxane (PDMS)

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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...

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： 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...

引用

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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Fiber-optic sensor based on Mach-Zehnder interferometer for securing entrance areas of buildings 14

Fiber-optic sensor based on Mach-Zehnder interferometer for ...

引用

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

作者： Nedoma, Jan Fajkus, Marcel Martinek, Radek Mec, Pavel Novak, Martin Bednarek, Lukas Vasinek, Vladimir Tech Univ Ostrava VSB Fac Elect Engn & Comp Sci Dept Telecommun Ostrava Czech Republic Tech Univ Ostrava VSB Fac Elect Engn & Comp Sci Dept Cybernet & Biomed Engn Ostrava Czech Republic Tech Univ Ostrava VSB Fac Civil Engn Dept Bldg Mat & Diagnost Struct Ostrava Czech Republic

ISBN: (纸本)9781510613454;9781510613447

Authors of this article focused on the utilization of fiber optic sensors based on interferometric measurements for securing entrance areas of buildings such as windows and doors. We described the implementation of the fiber-optic interferometer (type Mach-Zehnder) into the window frame or door, sensor sensitivity, analysis of the background noise and methods of signal evaluation. The advantage of presented solution is the use of standard telecommunication fiber standard G.652. D, high sensitivity, immunity of sensor to electromagnetic interference (EMI) and passivity of the sensor regarding power supply. Authors implemented the Graphical User Interface (GUI) which offers the possibility of remote monitoring presented sensing solution.

关键词： Mach-Zehnder interferometer fiber-optic sensor electromagnetic interference (EMI) security

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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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