Optics/Photonics in Security and Defence最新文献_第10页

Passive automatic anti-piracy defense system of ships 船舶被动自动反海盗防御系统

Optics/Photonics in Security and Defence Pub Date : 2013-10-16 DOI: 10.1117/12.2028731

M. Szustakowski, M. Życzkowski, W. Ciurapinski, M. Karol, M. Kastek, R. Stachowiak, P. Markowski

引用次数: 1

Gait patterns for crime fighting: statistical evaluation 打击犯罪的步态模式:统计评估

Optics/Photonics in Security and Defence Pub Date : 2013-10-16 DOI: 10.1117/12.2033323

K. Sulovská, S. Belaskova, M. Adamek

{"title":"Gait patterns for crime fighting: statistical evaluation","authors":"K. Sulovská, S. Belaskova, M. Adamek","doi":"10.1117/12.2033323","DOIUrl":"https://doi.org/10.1117/12.2033323","url":null,"abstract":"The criminality is omnipresent during the human history. Modern technology brings novel opportunities for identification of a perpetrator. One of these opportunities is an analysis of video recordings, which may be taken during the crime itself or before/after the crime. The video analysis can be classed as identification analyses, respectively identification of a person via externals. The bipedal locomotion focuses on human movement on the basis of their anatomical-physiological features. Nowadays, the human gait is tested by many laboratories to learn whether the identification via bipedal locomotion is possible or not. The aim of our study is to use 2D components out of 3D data from the VICON Mocap system for deep statistical analyses. This paper introduces recent results of a fundamental study focused on various gait patterns during different conditions. The study contains data from 12 participants. Curves obtained from these measurements were sorted, averaged and statistically tested to estimate the stability and distinctiveness of this biometrics. Results show satisfactory distinctness of some chosen points, while some do not embody significant difference. However, results presented in this paper are of initial phase of further deeper and more exacting analyses of gait patterns under different conditions.","PeriodicalId":344928,"journal":{"name":"Optics/Photonics in Security and Defence","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133722037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Human pose classification within the context of near-IR imagery tracking 近红外图像跟踪下的人体姿态分类

Optics/Photonics in Security and Defence Pub Date : 2013-10-16 DOI: 10.1117/12.2028375

Jiwan Han, A. Gaszczak, Ryszard Maciol, Stuart Barnes, T. Breckon

引用次数: 17

Uncooled MWIR InAs/GaSb type-II superlattice grown on a GaAs substrate 在GaAs衬底上生长的非冷却MWIR InAs/GaSb型超晶格

Optics/Photonics in Security and Defence Pub Date : 2013-10-16 DOI: 10.1117/12.2031949

M. Hobbs, F. Bastiman, C. H. Tan, J. David, S. Krishna, E. Plis

{"title":"Uncooled MWIR InAs/GaSb type-II superlattice grown on a GaAs substrate","authors":"M. Hobbs, F. Bastiman, C. H. Tan, J. David, S. Krishna, E. Plis","doi":"10.1117/12.2031949","DOIUrl":"https://doi.org/10.1117/12.2031949","url":null,"abstract":"InAs/GaSb type-II superlattices (T2SLs) are attractive due to their potentially low dark currents and high responsivity. These low dark currents arise due to reduced Auger recombination caused by the spatial separation between the electrons and holes. Coupling these two aspects together leads to the potential of high operating temperature and high D*. An additional attraction of T2SLs is their wavelength tunability; the wavelength can be tuned between 3 to 12 μm, making them attractive for the militarily important MWIR and long-wave infrared (LWIR) bands. InAs/GaSb T2SLs are traditionally grown upon GaSb substrates due to lattice matching of the type-II material on GaSb. However, GaSb substrates are relatively small and expensive compared with GaAs, leading to increased cost. Additionally, the high absorption coefficient of GaSb requires the substrate to be removed prior to use in FPAs. We present an InAs/GaSb T2SL grown upon a GaAs substrate which operates at room temperature. A room temperature spectral response could be measured for the layer, with responsivity and shot and thermal noise limited specific detectivity (D*) of 0.45 A/W and 8.0x108 cmHz1/2/W, respectively, at a bias voltage of -0.3 V. This uncooled operation D* is the best to date compared with the literature for a p-i-n or n-i-p MWIR structure grown upon a GaAs substrate.","PeriodicalId":344928,"journal":{"name":"Optics/Photonics in Security and Defence","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121552651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Effective criteria for the identification of substance using the spectral lines dynamics of reflected THz signal 利用反射太赫兹信号的谱线动态特性识别物质的有效准则

Optics/Photonics in Security and Defence Pub Date : 2013-10-16 DOI: 10.1117/12.2029005

V. Trofimov, S. A. Varentsova

引用次数: 14

Semiconductor alloys for optoelectronic applications: ab initio modeling 光电应用的半导体合金:从头开始建模

Optics/Photonics in Security and Defence Pub Date : 2013-10-16 DOI: 10.1117/12.2030965

P. Scharoch, M. Winiarski, M. Polak

{"title":"Semiconductor alloys for optoelectronic applications: ab initio modeling","authors":"P. Scharoch, M. Winiarski, M. Polak","doi":"10.1117/12.2030965","DOIUrl":"https://doi.org/10.1117/12.2030965","url":null,"abstract":"Semiconductor alloys, for example group III metal nitrides and phosphides, such as AxB1-xN or ANxP1−x (where A,B metal atoms: Al, In, Ga) have been materials of interest for optoelectronic applications (light emitting diodes, lasers, detectors) for more then two decades. The potential possibility of tuning (via variation of the composition) of the band-gap and the lattice constant make them particularly attractive. The idea of tuning the band-gap (from infrared to ultraviolet), although simple in principle, requires solving a variety of practical problems, like lattice constants misfit of parent compounds, associated with atom sizes, thermodynamically determined phase segregation, system stability, band-gap bowing, efficiency of radiative transitions etc. The ab initio modeling is of particular importance in the field, since it allows to predict in a purely theoretical way the physical limits for various properties. It also provides a hint in which direction, technologically and experimentally, to proceed. We present the basic ideas behind the ab initio modeling and, as an example, the calculation results of structural, elastic and the electronic properties of chosen alloys are presented.","PeriodicalId":344928,"journal":{"name":"Optics/Photonics in Security and Defence","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133207208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation of adaptive algorithms for detection and classification of fluorescent aerosols in the atmosphere 大气中荧光气溶胶检测和分类的自适应算法评价

Optics/Photonics in Security and Defence Pub Date : 2013-10-16 DOI: 10.1117/12.2028680

P. Lahaie, J. Simard, S. Buteau

{"title":"Evaluation of adaptive algorithms for detection and classification of fluorescent aerosols in the atmosphere","authors":"P. Lahaie, J. Simard, S. Buteau","doi":"10.1117/12.2028680","DOIUrl":"https://doi.org/10.1117/12.2028680","url":null,"abstract":"Photon counting technologies are developed and could be used in the future to measure the return from laser induced fluorescence. Currently, the spectral detection of light emitted by fluorescing aerosols is performed with ICCD, Intensified Charge Coupled Device. The signal to noise ratio of ICCD devices is smaller by a factor of √2compared to photon counting devices having the same sensitivity. We studied the impact of this difference of signal to noise ratio on the capability of multivariate detection and classification algorithms to operate on various conditions. Signal simulations have been performed to obtain ROC (Receiver Operation Characteristics) Curves and Confusion Matrix to obtain the detection performance and the ability of algorithms to discriminate a potential source from another. Two detection algorithms are used, the Integrated Laser Induced Fluorescence(ILIF) and the Matched Filter. For the classification, three algorithms are used, the Adaptive Matched Filter (AMF), the Adaptive Coherent Estimator (ACE) and the Adaptive Least Squares (ALS). The best algorithm for detection is the AMF using the signature of the material present in a cloud, the ILIF detector performs very well. For the classification, the three algorithms are surprisingly giving the same results for the same data. The classification performs better if the distance between the signatures recorded in a database is important. The performance of the detector and of the classificator improves with an increase of the signal to noise ratio and is consistently and significantly better for the photon counting compared to ICCD.","PeriodicalId":344928,"journal":{"name":"Optics/Photonics in Security and Defence","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114504910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Photoacoustic detection by means of a differential double resonator cell applied to security and defence 应用于安全和防御的差分双谐振腔光声探测

Optics/Photonics in Security and Defence Pub Date : 2013-10-16 DOI: 10.1117/12.2034482

A. Vallespi, V. Slezak, A. Peuriot, F. González, Andrea M. Pereyra, G. Santiago

{"title":"Photoacoustic detection by means of a differential double resonator cell applied to security and defence","authors":"A. Vallespi, V. Slezak, A. Peuriot, F. González, Andrea M. Pereyra, G. Santiago","doi":"10.1117/12.2034482","DOIUrl":"https://doi.org/10.1117/12.2034482","url":null,"abstract":"The purpose of this article is to present a sensitive optical system for immediate detection of traces of ammonia by means of photoacoustic spectroscopy and study some properties with both a pulsed CO2 laser (TEA) and a CW CO2 laser. The laser beam is aimed to an innovative dual resonator differential cell, which lowest resonant frequency is the first longitudinal mode at 1205 Hz, filled with a flowing NH3 and N2 mixture. The chosen cell’s material is polypropylene, suitable for reducing the effects of adsorption. As a result of physical adsorption-desorption studies, based on a pulsed CO2 laser, 5 % PA signal decay from an enclosed sample of 248 ppmV of NH3 in N2 is recorded within 1 hour. The setup for CW CO2 laser excitation takes advantage of a differential microphone connected to both resonators by picking up out of phase signals. For this purpose, the beam is modulated at the cell’s resonance by means of a chopper with a special blade which allows both reflection and transmission of the laser beam; the direct and the reflected beam are alternatively aimed to one resonator and the other. The measurements show that for the double resonator configuration a signal increase is achieved, as expected from the study of the sensitivity of both resonators separately, which have been previously characterized. Measurements with this system indicate a limit of detection of 13ppbV at the 10P(32) laser line, deduced from one standard deviation of the PA signal from pure N2.","PeriodicalId":344928,"journal":{"name":"Optics/Photonics in Security and Defence","volume":"8901 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130404193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nanovectors as a complex solution for optical securing 纳米矢量作为光学固定的复杂解决方案

Optics/Photonics in Security and Defence Pub Date : 2013-10-16 DOI: 10.1117/12.2029089

A. Bednarkiewicz, W. Stręk, D. Hreniak

{"title":"Nanovectors as a complex solution for optical securing","authors":"A. Bednarkiewicz, W. Stręk, D. Hreniak","doi":"10.1117/12.2029089","DOIUrl":"https://doi.org/10.1117/12.2029089","url":null,"abstract":"Nanovectors technology is a comprehensive solution, which comprises unique luminescent nanolabels, dedicated equipment for reading of the same and verification algorithms – all devoted for anti-forgery protection of valuable objects. Nanovectors themselves have a complex and unique luminescence spectrum fingerprint resulting from the selection of their composition, type and substrates, which make any attempt to fake the spectral information practically impossible. Nanovectors constitute a special code enabling correct identification only for specified measurement conditions. Moreover, nanovectors may be used for marking of a wide range of products such as documents, ID cards, access cards and employee cards, spare parts, elements of packaging, liquids, greases etc. Either entire volume of objects during their production process, pressing in a specified location of an object after production or unique printing on the object’s surface may be conveniently employed. Nanovectors are most often manufactured as invisible security features and, therefore, special tools are necessary to detect their presence. This work was focused on experimental verification of reproducibility of Nanovectors reading and theoretical estimation of maximal number of distinguishable optical codes, which confirmed the ability to unequivocally design thousands of such spectral fingerprints.","PeriodicalId":344928,"journal":{"name":"Optics/Photonics in Security and Defence","volume":"162 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127304871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation, linear and NLO properties of DNA-CTMA-SBE complexes DNA-CTMA-SBE配合物的制备、线性和NLO性质

Optics/Photonics in Security and Defence Pub Date : 2013-10-16 DOI: 10.1117/12.2029326

A. Manea, I. Rău, F. Kajzar, A. Meghea

引用次数: 6