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

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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...

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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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COMPLEX OF THE NEW GENERATION OF THE INSTRUMENTAL ANALYTICAL APPROACHES TO PREVENT DANGEROUS BIOTERORISM 10

COMPLEX OF THE NEW GENERATION OF THE INSTRUMENTAL ANALYTICAL...

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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： Starodub, Nickolaj F. Shavanova, Kateryna Karpiuk, Andrii Natl Univ Life & Environm Sci Ukraine UA-03041 Kiev Ukraine

ISBN: (纸本)9781628413168

The real manifestations of biowarfare were only during local military conflicts. In previous times the danger with this factor forms through activation of terrorist organizations. To prevent non-desirable consequences and to preserve the lives and health of people it is necessary to provide constant control by the application of complex of the new generation of the instrumental devices based on the principles of biosensorics which allow rapid revealing step by step: total toxicity of environmental objects, presence of appropriate groups and specific chemical substances among them. It is demonstrated simple and rapid estimation of the total toxicity through the control of the intensity of chlorophyll fluorescence (IChF) by the direct or remote ways by the device "Floratest" (Ukraine). There is possible on the basis of IChF curve of growing plants from some territory during appropriate period to reveal appearance of toxic substances in this area. Their presence in more local cases may be done by using bioluminescent bacteria (pure Ukrainian strains) or/and controlling short term Daphnia living medium by developed portable chemiluminometer. For the revealing of some groups of toxic elements it is recommended the cerium oxide ISFETs based enzymatic biosensors. The last and devices based on SPR ("Plasmotest", Ukraine), porous silicon (with the registration of biospecific interaction macromolecules by luminescence or electro conductivity) and some nano-metal oxides were realized in immune biosensors at the determination of content of number of mycotoxins, some microorganisms (Salmonella spp.) and diagnostics of viral disease (retroviral leucosis). We present the main characteristics of the above mentioned devices and give confirmation that all the analysis meets practice demands. Overall time of analysis is in range 10 min and it is very simple and may be realized in field conditions.

关键词： Biosensors optical electrochemical nano-structures environment control toxins infection diseases diagnostics

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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 ...

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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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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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Embedded security system for multi-modal surveillance in a railway carriage 11

Embedded security system for multi-modal surveillance in a r...

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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： Zouaoui, Rhalem Audigier, Romaric Ambellouis, Sebastien Capman, Francois Benhadda, Hamid Joudrier, Stephanie Sodoyer, David Lamarque, Thierry THALES Adv Studies Dept THALES CEA VisionLab 1 Ave Augustin Fresnel F-91767 Palaiseau France CEA LIST Vis & Content Engn Lab THALES CEA VisionLab F-91191 Gif Sur Yvette France IFSTTAR F-59666 Villeneuve Dascq France THALES Commun & Secur Genneviliers France

ISBN: (纸本)9781628418620

Public transport security is one of the main priorities of the public authorities when fighting against crime and terrorism. In this context, there is a great demand for autonomous systems able to detect abnormal events such as violent acts aboard passenger cars and intrusions when the train is parked at the depot. To this end, we present an innovative approach which aims at providing efficient automatic event detection by fusing video and audio analytics and reducing the false alarm rate compared to classical stand-alone video detection. The multi-modal system is composed of two microphones and one camera and integrates onboard video and audio analytics and fusion capabilities. On the one hand, for detecting intrusion, the system relies on the fusion of "unusual" audio events detection with intrusion detections from video processing. The audio analysis consists in modeling the normal ambience and detecting deviation from the trained models during testing. This unsupervised approach is based on clustering of automatically extracted segments of acoustic features and statistical Gaussian Mixture Model (GMM) modeling of each cluster. The intrusion detection is based on the three-dimensional (3D) detection and tracking of individuals in the videos. On the other hand, for violent events detection, the system fuses unsupervised and supervised audio algorithms with video event detection. The supervised audio technique detects specific events such as shouts. A GMM is used to catch the formant structure of a shout signal. Video analytics use an original approach for detecting aggressive motion by focusing on erratic motion patterns specific to violent events. As data with violent events is not easily available, a normality model with structured motions from non-violent videos is learned for one-class classification. A fusion algorithm based on Dempster-Shafer's theory analyses the asynchronous detection outputs and computes the degree of belief of each probable event.

关键词： Public transport security violent and vandalism acts embedded system audio and video events detection unsupervised and supervised approaches data fusion real and synthetic scenes evaluation

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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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LIBS spectra of multi-component Al, Fe, Cu alloys and composite materials used for selected elements of armament and munition 14

LIBS spectra of multi-component Al, Fe, Cu alloys and compos...

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

作者： Ostrowski, R. Skrzeczanowski, W. Rycyk, A. Czyz, K. Sarzynski, A. Strzelec, M. Jach, K. Swierczynski, R. Mil Univ Technol Inst Optoelect 2 Gen Sylwestra Kaliskiego St PL-00908 Warsaw Poland

ISBN: (纸本)9781510613454;9781510613447

Spectral investigations in the UV-VIS range of selected Al, Cu, and Fe alloys and composite materials were performed using LIBS technique. The investigated objects were typical rifle cartridges, mortars, rocket launchers and samples of different type steel, Cu and Al alloys, as well as composite materials of special chemical composition. Two Nd:YAG lasers were applied: a short 4 ns, 60 mJ Brio Quantel/BigSky laser (1064 nm) and a long pulse 200/400 (up to 1000) mu s (similar to 2/4 up to 10 J) laser (1064 nm) constructed at the Institute of Optoelectronics MUT. This spectrochemical analysis was possible for Al, Cu, and Fe alloys objects for both lasers, and in case of composites only if the samples were irradiated by short laser pulse since in the experiment with the long pulse, all composite materials spectra, in general, were very similar to each other - they imitated a grey/black body spectra. For metal alloys in experiments with a short laser pulse only atomic spectra were observed while for long microsecond laser pulses molecular transitions have been registered for Al alloys. Electron temperatures of plasma created on different materials for short and long laser pulses were found on the base of Boltzmann plots. Temperatures are clearly higher for plasmas generated with a short laser pulse which results from much higher laser power density on the sample surface for short pulse and not from fluence which is 20-40 times larger for long pulse.

关键词： LIBS spectra metal alloys laser-matter interaction military materials

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Bio-inspired materials for electrochemical devices 11

Bio-inspired materials for electrochemical devices

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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： Pawlicka, A. Firmino, A. Sentanin, F. Sabadini, R. C. Jimenez, D. E. Q. Jayme, C. C. Mindroiu, M. Zgarian, R. G. Tihan, G. T. Rau, I. Silva, M. M. Nogueira, A. F. Kanicki, J. Kajzar, F. Univ Sao Paulo IQSC Ave Trabalhador Saocarlense 400 BR-13566590 Sao Carlos SP Brazil Univ Michigan EECS Ann Arbor MI 48109 USA Univ Politehnika Bucharest Fac Appl Chem & Mat Sci Bucharest Romania Univ Minho Ctr Quim P-4710057 Braga Portugal Univ Estadual Campinas Inst Quim BR-13083970 Campinas SP Brazil Ecole Normale Super Lyon Chem Lab F-69364 Lyon France

ISBN: (纸本)9781628418620

Natural macromolecules are very promising row materials to be used in modern technology including security and defense. They are abundant in nature, easy to extract and possess biocompatibility and biodegradability properties. These materials can be modified throughout chemical or physical processes, and can be doped with lithium and rare earth salts, ionic liquids, organic and inorganic acids. In this communication samples of DNA and modified DNA were doped with Prussian Blue (PB), poly(ethylene dioxythiophene) (PEDOT), europium and erbium triflate and organic dyes such as Nile Blue (NB), Disperse Red 1 (DR1) and Disperse Orange 3 (DO3). The colored or colorless membranes were characterized by electrochemical and spectroscopic measurements, and they were applied in electrochromic devices (ECDs) and dye sensitized solar cells (DSSC). ECDs change the color under applied potential, so they can modulate the intensity of transmitted light of 15 to 35%. As the electrochromic materials, WO3 or Prussian blue (PB), are usually blue colored, the color change is from transparent to blue. DNA, and the complexes: DNA-CTMA, DNA-DODA and DNA-PEDOT: PSS were also investigated as either hole carrier material (HTM) or polymer electrolyte in dye-sensitized solar cells (DSSC). The DNA-based samples as HTM in small DSSCs revealed a solar energy conversion efficiency of 0.56%. Polymer electrolytes of DNA-CTMA and DNA-DODA, both with 10 wt% of LiI/I-2, applied in small DSSC, exhibited the efficiencies of 0.18 and 0.66%, respectively. The obtained results show that natural macromolecules-based membranes are not only environmentally friendly but are also promising materials to be investigated for several electrochemical devices. However, to obtain better performances more research is still needed.

关键词： DNA DNA-based membranes electrochromic devices dye-sensitized solar cells

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