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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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Graphene-based electronic devices for radiation detection and thermosensing 2

Graphene-based electronic devices for radiation detection an...

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Advanced materials, biomaterials, and Manufacturing Technologies for security and defence II 2024

作者： Behera, Saraswati Chalmers University of Technology Gothenburg Sweden

ISBN: (纸本)9781510681187

Single-layer-CVD graphene is grown and integrated into passive electronic interfaces through a cost-effective optical fabrication approach. Raman characterizations are carried out to verify the single-layer nature of the grown graphene. The realized antenna-free, non-gated, and passive electronic device with Ge/Au contacts to graphene shows radiation detection (94 GHz) and thermosensing (6K-120 K) based on the radiation-induced thermoelectric effects in graphene. Further, a Ti/Au contacted graphene electronic device is fabricated and characterized through current-voltage measurements at cryogenic temperatures (7-140 K). Ti-Au contacted electronic device shows thermo-resistive sensing that is applicable to negative temperature coefficient (NTC) thermistors. Application and future scopes of these graphene radiation detectors and thermosensors can be in temperature monitoring in graphene-integrated electronic and quantum devices, terahertz communications, thermal imaging, space, and environmental monitoring. © 2024 SPIE.

关键词： Microwave antennas

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Free-space quantum key distribution with spatial modes of the optical field

Free-space quantum key distribution with spatial modes of th...

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conference on Optics and Photonics for Counterterrorism and Crime Fighting VII/optical materials in defence systems technology VIII/Quantum-Physics-Based Information security

作者： Gruneisen, Mark T. Dymale, Raymond C. Stoltenberg, Kurt E. USAF Res Lab Directed Energy Directorate Kirtland AFB NM 87117 USA

ISBN: (纸本)9780819488176

The scalar attributes of the optical field are considered as an approach to enhancing bit rates in quantum key distribution over free-space optical links The implications of spatial-mode encoding to system aperture requirements are considered for rectilinear and azimuthal bases of phase modulation. Diffractive-optics-based approaches to generating and discriminating photons based on spatial mode characteristics are quantified through analysis and experimentation Spatial modes based on phase modulation are generated via modulo-In phase modulation with a liquid-crystal spatial light modulator (LC SLM). The phase and amplitude modulation associated with superpositions of phase modulated fields are achieved via computer-generated holography with single LC SLM. Transmission volume holograms are evaluated as a technique for de-multiplexing phase modulated modes and cascaded volume holograms are considered as an approach to performing projective measurements on optical fields.

关键词： quantum key distribution optical vortices photon orbital angular momentum computer-generated holography volume holography spatial light modulators projective quantum measurements

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Investigation of the performance of video analytics systems with compressed video using the i-LIDS sterile zone dataset

Investigation of the performance of video analytics systems ...

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conference on Optics and Photonics for Counterterrorism and Crime Fighting VII/optical materials in defence systems technology VIII/Quantum-Physics-Based Information security

作者： Mahendrarajah, Prashath Home Off Ctr Appl Sci & Technol Horsham RH12 4WX W Sussex England

ISBN: (纸本)9780819488176

Recent years have seen significant investment and increasingly effective use of Video Analytics (VA) systems to detect intrusion or attacks in sterile areas. Currently there are a number of manufacturers who have achieved the Imagery Library for Intelligent Detection System (i-LIDS) primary detection classification performance standard for the sterile zone detection scenario. These manufacturers have demonstrated the performance of their systems under evaluation conditions using an uncompressed evaluation video. In this paper we consider the effect on the detection rate of an i-LIDS primary approved sterile zone system using compressed sterile zone scenario video clips as the input. The preliminary test results demonstrate a change time of detection rate with compression as the time to alarm increased with greater compression. Initial experiments suggest that the detection performance does not linearly degrade as a function of compression ratio. These experiments form a starting point for a wider set of planned trials that the Home Office will carry out over the next 12 months.

关键词： i-LIDS Video Based Detection systems compression test Video Analytics Evaluation Datasets Home Office Centre for Applied Science and technology

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Spatially Offset Raman Spectroscopy (SORS) for Liquid Screening

Spatially Offset Raman Spectroscopy (SORS) for Liquid Screen...

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conference on Optics and Photonics for Counterterrorism and Crime Fighting VII/optical materials in defence systems technology VIII/Quantum-Physics-Based Information security

作者： Loeffen, Paul W. Maskall, Guy Bonthron, Stuart Bloomfield, Matthew Tombling, Craig Matousek, Pavel Cobalt Light Syst Ltd Harwell Oxford OX11 0QR Oxon England

ISBN: (纸本)9780819488176

Recently, Spatially Offset Raman Spectroscopy (SORS) has been discussed as a novel method for the screening of liquids, aerosols and gels (LAGs) at airports and for other security applications. SORS is an optical spectroscopic method which enables the precise chemical identification of substances from a reference list and, due to the rich spectral information, has an inherently high probability of detection and low false alarm rate. The method is generally capable of screening substances inside non-metallic containers such as plastic and glass bottles. SORS is typically successful through opaque plastic and coloured glass, which are often challenging for conventional backscatter Raman spectroscopy. SORS is performed in just a few seconds by shining a laser light onto the container and then measuring the Raman signal at the excitation point but also at one or more offset positions. Each measurement has different relative orthogonal contributions from the container and contents Raman spectra, so that, with no prior knowledge, the pure Raman spectra of both the container and contents can be extracted - either by scaled subtraction or via multivariate statistical methods in an automated process. In this paper, the latest results will be described from a prototype SORS device designed for aviation security and the advantages and limitations of SORS will be discussed.

关键词： SORS Raman spectroscopy liquid explosives aviation security homeland security

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A space variant Maximum Average Correlation Height (MACH) filter for object recognition in real time thermal images for security applications

A space variant Maximum Average Correlation Height (MACH) fi...

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conference on Optics and Photon for Counterterrorism and Crime Fighting VI/optical materials in defence systems technology VII

作者： Gardezi, Akber Alkandri, Ahmed Birch, Philip Young, Rupert Chatwin, Chris Univ Sussex Sch Engn & Design Brighton BN1 9QT E Sussex England

ISBN: (纸本)9780819483560

We propose a space variant Maximum Average Correlation Height (MACH) filter which can be locally modified depending upon its position in the input frame. This can be used to detect targets in an environment from varying ranges and in unpredictable weather conditions using thermal images. It enables adaptation of the filter dependant on background heat signature variances and also enables the normalization of the filter energy levels. The kernel can be normalized to remove a non-uniform brightness distribution if this occurs in different regions of the image. The main constraint in this implementation is the dependence on computational ability of the system. This can be minimized with the recent advances in optical correlators using scanning holographic memory, as proposed by Birch et al. [1] In this paper we describe the discrimination abilities of the MACH filter against background heat signature variances and tolerance to changes in scale and calculate the improvement in detection capabilities with the introduction of a non-linearity. We propose a security detection system which exhibits a joint process where human and an automated pattern recognition system contribute to the overall solution for the detection of pre-defined targets.

关键词： MACH filter correlation filter space variant filter pattern recognition thermal images

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optical and Manufacturing design aware flow for Metalenses

Optical and Manufacturing design aware flow for Metalenses

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Advanced materials, biomaterials, and Manufacturing Technologies for security and defence 2023

作者： Chalony, M. Kuechler, B. Zimmermann, R. Xu, C. Melvin, L. Viasnoff, E. Synopsys EV Pole D’Active Hyèrois 1128 Route de Toulon Hyeres83400 France Synopsys GmbH Karl-Hammerschmidt-Strasse 34/Dornach AschheimD-85609 Germany Synopsys Inc 400 Executive Boulevard Suite 101 OssiningNY10562 United States Synopsys Inc 690 E. Middlefield Road Mountain ViewCA United States Synopsys Inc 2025 Cornelius Pass Road HillsboroOR97124 United States

ISBN: (纸本)9781510667112

Metalenses pave the way for drastic miniaturization of imaging systems like electric vehicle cameras, phones, and various other micro-camera applications1. As an example, researchers in the U.S. used semiconductor manufacturing techniques to produce a large aperture, flat metalens. It was used as the objective lens in a simple telescope. The telescope achieved resolving power superior to refractive and reflective optics and produced clear images of the surface of the Moon2. Though metalenses are a promising advance in scaling down the size of optical systems, there are challenges, both in their design and preparing them for high volume manufacturing. In this paper, we demonstrate the advantage of a manufacturing aware design flow that combines advanced technology from optical design and manufacturing processes design software that brings a manufactured metalens closer to the ideal metalens performance. The flow aids the implementation of design rules from and to optical and manufacturing design, allows the designer to shorten the design cycle, and ultimately stives for the target of a first design correct metalens. © 2023 SPIE.

关键词： Telescopes

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Proceedings of SPIE - The International Society for optical Engineering

Proceedings of SPIE - The International Society for Optical ...

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optical materials and biomaterials in security and defence systems technology XV 2018

ISBN: (纸本)9781510621855

The proceedings contain 7 papers. The topics discussed include: fiber-optic sensors encapsulated into biocompatible polymer material for monitoring the heart rate of the human body;analysis the effect of thermal load on the insertion loss of the optical couplers;a comparison of probes based on Bragg grating sensor and microphones for heart sounds measurement;exploring a direct printing technique for polymeric optical interconnects and modulators;and light amplification and photo-isomerization characteristics of laser dyes and azo molecules incorporated into DNA-complex systems.

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Screening Mail for Powders using Terahertz technology

Screening Mail for Powders using Terahertz Technology

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conference on Optics and Photonics for Counterterrorism and Crime Fighting VII/optical materials in defence systems technology VIII/Quantum-Physics-Based Information security

作者： Kemp, Mike Iconal Technol Ltd St Johns Innovat Ctr Cambridge CB4 0WS England

ISBN: (纸本)9780819488176

Following the 2001 Anthrax letter attacks in the USA, there has been a continuing interest in techniques that can detect or identify so-called 'white powder' concealed in envelopes. Electromagnetic waves (wavelengths 100-500 mu m) in the terahertz frequency range penetrate paper and have short enough wavelengths to provide good resolution images;some materials also have spectroscopic signatures in the terahertz region. We report on an experimental study into the use of terahertz imaging and spectroscopy for mail screening. Spectroscopic signatures of target powders were measured and, using a specially designed test rig, a number of imaging methods based on reflection, transmission and scattering were investigated. It was found that, contrary to some previous reports, bacterial spores do not appear to have any strong spectroscopic signatures which would enable them to be identified. Imaging techniques based on reflection imaging and scattering are ineffective in this application, due to the similarities in optical properties between powders of interest and paper. However, transmission imaging using time-of-flight of terahertz pulses was found to be a very simple and sensitive method of detecting small quantities (25 mg) of powder, even in quite thick envelopes. An initial feasibility study indicates that this method could be used as the basis of a practical mail screening system.

关键词： mail screening detection terahertz imaging spectroscopy white powder chemical biological CB THz

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Proceedings of SPIE - The International Society for optical Engineering

Proceedings of SPIE - The International Society for Optical ...

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Optics and Photonics for Counterterrorism, Crime Fighting, and defence XI;and optical materials and biomaterials in security and defence systems technology XII

ISBN: (纸本)9781628418620

The proceedings contain 29 papers. The topics discussed include: principal limitation of standard THz time-domain spectroscopy method of the detection and identification of substance and way of its overcoming;embedded security system for multi-modal surveillance in a railway carriage;automatic inference of geometric camera parameters and inter-camera topology in uncalibrated disjoint surveillance cameras;incremental concept learning with few training examples and hierarchical classification;posture estimation for improved photogrammetric localization of pedestrians in monocular infrared imagery;detecting abandoned objects using interacting multiple models;multi- feature based robust face detection and coarse alignment method via multiple kernel learning;and video content analysis on body-worn cameras for retrospective investigation.

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Spatially offset Raman spectroscopy (SORS) for through-barrier proximal chemical and explosive detection

Spatially offset Raman spectroscopy (SORS) for through-barri...

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conference on Optics and Photonics for Counterterrorism and Crime Fighting VII/optical materials in defence systems technology VIII/Quantum-Physics-Based Information security

作者： Frisby, Alex Lee, Linda Howle, Chris Martin, Andy Hopkins, Rebecca Dstl Salisbury SP4 0JQ Wilts England

ISBN: (纸本)9780819488176

The capability to detect toxic chemicals and explosive materials through a wide range of container types has a variety of applications, including liquid screening at airport entrance points. Conventional Raman spectroscopy is commonly used for chemical detection, but can result in an intense spectral response due to scattering and/or fluorescence from the container when used for through-barrier applications. Such a response can reduce the effectiveness of the technique for analysis of the container contents by swamping the Raman signature of the target material. By producing two spectra containing different contributions from the container and the contents, spatially offset Raman spectroscopy (SORS) allows a spectrum of the contents to be obtained, even through fluorescing containers. This innovative technique could provide a through-barrier detection capability for a wider range of containers than conventional Raman spectroscopy, including containers made from coloured glass and opaque plastic. In this paper, the use of SORS for through-barrier detection is introduced, and its ability to detect a range of analytes through a range of container materials evaluated. The potential advantages of using a longer excitation wavelength (e.g. 1064 nm) to reduce sample fluorescence are also explored, focussing on target analytes mixed with fluorescent materials.

关键词： Spatially offset Raman spectroscopy explosives chemical detection security screening through-barrier

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