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检索条件"任意字段=Optical Materials and Biomaterials in Security and Defence Systems Technology XV 2018"

共 75 条记录，以下是1-10 订阅

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Exploring a Direct Printing Technique for Polymeric optical Interconnects and Modulators 15

Exploring a Direct Printing Technique for Polymeric Optical ...

引用

Conference on optical materials and biomaterials in security and defence systems technology xv

作者： Aga, R. S. Kreit, E. B. Ouchen, F. Bartsch, C. M. Heckman, E. M. KBRWyle 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)9781510621862

ISBN: (纸本)9781510621862

Direct printing technique has become indispensable in flexible electronics and low cost sensor applications. It has transformed into an enabling technology for many flexible devices. However, it is not very well explored for printing optical materials. In this work, a micro-dispense printer for printing polymeric optical waveguides was custom-built. It was employed to develop a simple method to couple light into printed optical interconnects. It was also used to apply a voltage bias during printing and drying of electro-optic polymer (SEO110) to pole the SEO110 in-situ with the goal of eliminating the need for traditional high temperature contact poling. With this in-situ poling method, electro-optic effect in SEO110 was demonstrated.

关键词： additive manufacturing interconnect optical modulator electronic integration printed electronics

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Analysis the effect of thermal load on the insertion loss of the optical couplers 15

Analysis the effect of thermal load on the insertion loss of...

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Conference on optical materials and biomaterials in security and defence systems technology xv

作者： Nedoma, Jan Fajkus, Marcel Zabka, Stanislav Novak, Martin Jaros, Rene Martinek, Radek VSB Tech Univ Ostrava Fac Elect Engn & Comp Sci Dept Telecommun Ostrava Czech Republic VSB Tech Univ Ostrava Fac Elect Engn & Comp Sci Dept Cybernet & Biomed Engn Ostrava Czech Republic

ISBN: (数字)9781510621862

ISBN: (纸本)9781510621862

This article focuses on the analysis of the selected optical coupler parameter which have been thermal stressed for 30 weeks at temperature 95 degrees C +/- 5 degrees C. optical couplers with 10:90, 1:99 and 50:50 dividing ratio were tested. A total of 6 optical couplers were tested. Measurements were made for two wavelengths 1310 nm and 1550 nm. The observed parameter was the insertion loss. The insertion loss is very important parameter because the fiber-optic passive components (such as optical couplers) disrupt signal transmissions as the continuous core of the optical fiber carrying the signal mates with the component in a manner that causes some amount of scattering and reflection of light waves. The degree to which the signal has been depleted is described as insertion loss, which is the undesired attenuation of the signal measured in decibels (dB).

关键词： Thermal load optical coupler insertion loss

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Photoluminescence study of Yb³⁺/Er³⁺ co-doped Sb₂O₃-WO₃-Li₂O (SWL) ceramic phosphor for fingerprint detection in forensic science & security writing 15

Photoluminescence study of Yb<SUP>3+</SUP>/Er<SUP>3+</SUP> c...

引用

Conference on optical materials and biomaterials in security and defence systems technology xv

作者： Sukul, Prasenjit Prasad Kumar, Kaushal Indian Inst Technol ISM Dept Appl Phys Opt Mat & Bioimaging Res Lab Dhanbad Bihar India

ISBN: (纸本)9781510621862

The article reports the development of invisible cryptography writing and latent fingerprint detection techniques using upconversion emission of rare earth doped ceramic for the application in forensic science. The upconversion (UC) emission studies on Yb3+/Er3+ co-doped Sb2O3-WO3-Li2O (SWL) ceramics under 980 nm laser excitation has been done. Due to its intense green and red visible emission, the ceramic finds a great application in developing latent fingermark detection using powder dusting technique. In addition to fingerprint detection, the present ceramic is a promising candidate for coding cyphers in invisible manner. An observed comparison between UV vs. NIR excited fingerprint images shows that fingerprint images exposed by NIR excitation have more clear edges than the UV excitations. Hence the current upconversion emission studies on the present ceramic samples reveal its potential application in forensic science, security writing and cryptography information (cypher).

关键词： Upconversion invisible cypher cryptography fingerprint detection

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A Comparison of Probes Based on Bragg Grating Sensor and Microphones for Heart Sounds Measurement 15

A Comparison of Probes Based on Bragg Grating Sensor and Mic...

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Conference on optical materials and biomaterials in security and defence systems technology xv

作者： Martinek, R. Brablik, J. Soustek, L. Kolarik, J. Fajkus, M. Nedoma, J. Kahankova, R. VSB Tech Univ Ostrava Fac Elect Engn & Comp Sci Dept Cybernet & Biomed Engn Ostrava Czech Republic VSB Tech Univ Ostrava Fac Elect Engn & Comp Sci Dept Telecommun Ostrava Czech Republic

ISBN: (数字)9781510621862

ISBN: (纸本)9781510621862

This paper presents the comparison of fibre-optic Bragg Grating Sensor with the commercially available probes for heart sounds measurement based on microphones. The analysis of the sensitivity and specificity was carried out to assess the efficacy of the individual measuring probes. Since fibre-optic sensing uses light in optical fibre rather than electricity, it solves the limitations of electrical sensors such as transmission loss and susceptibility to electromagnetic interference (EMI). Experimental results have shown that Fibre-Optic Bragg Grating Sensor significantly outperforms the devices using the microphones. Moreover, the sensor embedded in polydimethylsiloxane polymer and is fixed on the thorax by means of elastic belt. The material is biocompatible and immune to electromagnetic interference, which is major advantage for the healthcare environment. The probe dimensions are small;therefore, it would be convenient for the patient and easily implemented into clinical practice. Nevertheless, the signal processing methods must be applied to separate the desired signal from the environmental noise.

关键词： Fibre-Optic Bragg Grating Sensor (FGB) Heart Sounds Microphones optical Fibre Signal Processing Methods

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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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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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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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