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Intense Microwave Pulses v conference

作者： Koshelev, vI Buyanov, YI Kovalchuk, BM Andreev, YA Belichenko, vP Efremov, AM Plisko, vv Sukhushin, KN vizir, vA Zorin, vB High Current Electronics Institute (Russia)

ISBN: (纸本)081942580X

Basing on energetic processes studying in the near-field radiator zone, a new concept of antenna synthesizing for ultrawideband electromagnetic pulse radiation has been suggested. The results of experimental investigations of the antennae developed with using of this concept for high-power applications are presented. The antennae have small dimensions, high electrical strength, cardioid pattern with linear polarization of the pulse radiated and they are ideally adapted to be used as a steering antenna array element. A high-voltage nanosecond bipolar pulse generator design to excite antennae is described.

关键词： electromagnetic purse ultrawideband transmitting antenna cardioid pattern high-voltage bipolar pulse generator

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In-situ investigation of protein and DNA structure using UvRRS

In-situ investigation of protein and DNA structure using UVR...

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conference on optical Diagnostics of Biological Fluids and Advanced Techniques in Analytical Cytology

作者： Greek, LS Schulze, HG Blades, MW Haynes, CA Turner, RFB UNIV BRITISH COLUMBIA BIOTECHNOL LABVANCOUVERBC V6T 1Z3CANADA

ISBN: (纸本)0819423939

Ultraviolet resonance Raman spectroscopy (UvRRS) has the potential to become a sensitive, specific, versatile bioanalytical and biophysical technique for routine investigations of proteins, DNA, and their monomeric components, as well as a variety smaller, physiologically important aromatic molecules. The transition of UvRRS from a complex, specialized spectroscopic method to a common laboratory assay depends upon several developments, including a robust sample introduction method permitting routine, in situ analysis in standard laboratory environments. To this end we recently reported the first fiber-optic probes suitable for deep-Uv pulsed laser UvRRS1-4. In this paper, we extend this work by demonstrating the applicability of such probes to studies of biochemical relevance, including investigations of the resonance enhancement of phosphotyrosine, thermal denaturation of RNase TI, and specific and non-specific protein binding. The advantages and disadvantages of the probes are discussed with reference to sample conditions and probe design considerations.

关键词： Raman spectroscopy ultraviolet resonance Raman spectroscopy optical fibers protein structure protein phosphorylation tyrosine phosphorylation protein binding

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Recent developments of the electron-bombarded CCD image tubes

Recent developments of the electron-bombarded CCD image tube...

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3rd conference on Photonic Systems for Ecological Monitoring

作者： Dalinenko, I Kossov, v Kozlov, v Lazovsky, L Malyarov, A vishnevsky, G vydrevitch, M Zhuk, A Electron National Research Institute (Russia)

ISBN: (纸本)0819426326

The results of more than 10 years experience in design and manufacturing of thinned back-side illuminated CCDs of different types are summed up. Based upon the EB CCDs created, the family of intensified electron-bombarded CCD image tubes has been designed, fabricated and tested This family includes: the single-stage Gem I type EB CCD devices with the 532*580 and 780*580 pixels CCDs;the ''hybrid'' (the EB CCD tube plus GenjI image intensifier) devices;and the EB CCD tubes with the 40 mm photocathode and image demagnification factor 3:1. The results of tests of these devices are presented and discussed. Besides, the near future projects concerning EB CCD tubes with the 80 mm photocathode and with image demagnification factor 5:1, and EB CCD tubes with solar blind photocathodes for the Uv and EUv applications are briefly described.

关键词： Charge coupled devices

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current status of the British Aerospace resistor array IR scene projector technology

Current status of the British Aerospace resistor array IR sc...

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2nd conference on Technologies for Synthetic Environments - Hardware-in-the-Loop Testing

作者： Pritchard, AP Lake, SP Balmond, MD Gough, DW venables, MA Sturland, IM Crisp, G Watkin, SC British Aerospace PLC (United Kingdom)

ISBN: (纸本)0819424994

This paper describes the cumulative status to-date, and current developments in the British Aerospace IR scene projector system technology in early 1997. The systems have been developed for Hardware-in-the-loop (HWIL) simulation in missile test and evaluation facilities. Historically, the technology has been called ''Thermal Picture Synthesis'' an early equivalent of what is now known as Infra-red Scene Projection (IRSP). Earlier generations of system were based on a monolithic resistor-substrate construction, a modification of which is still used for ground target simulations (TPS3), whereas the more recent systems for air target simulations are based on fully suspended resistor designs (TPS4). These projector systems incorporating full scale arrays have been fabricated at up to 256 x 256 complexity. Research work is being carried out on high temperature arrays for air-to-air countermeasure simulations, and the first TPS5 full system at 512 x 512 complexity has completed its design stage and has recently moved into fabrication. Research testbed arrays of 768 x 768 have just been made, and 1024 x 1024 arrays are presently being fabricated. The paper includes an initial introduction to the basics of the technology, and is followed by a section on certain specialised features to combat inherent issues in the technology. Specifications and the current status of each category of device is then given.

关键词： infra-red scene projectors resistor arrays hardware-in-the-loop simulation

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Application of fibre optical current transducer to protection

Application of fibre optical current transducer to protectio...

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Sixth International conference on developments in Power System Protection (Conf. Publ. No. 434)

作者： H.Y. Li P.A. Crossley R.K. Aggarwal Manchester Centre for Electrical Energy UMIST (University of Manchester Institute of Science and Technology) Manchester UK School of Electronic and Electrical Engineering University of Bath Bath UK

This paper describes the design of a fibre optical current transducer based on a mirror Faraday rotator. Computer simulation techniques are used to model the transducer, and to assess its operating performance. The transducer is used to measure the fault current waveforms encountered on a 33 kv distribution feeder. The measured waveforms are processed by a current differential scheme applied to the protection of this feeder. The operating performance of the protection is analysed and compared with the performance obtained when using conventional current transformers. Conclusions are drawn regarding the advantages and disadvantages of using fibre optical current transducers in protection relaying.

关键词： Power system protection

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design and analysis of a small bispectral infrared push broom scanner for hot spot recognition

Design and analysis of a small bispectral infrared push broo...

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5th conference on Infrared Spaceborne Remote Sensing, at SPIEs Annual Meeting

作者： Lorenz, E Skrbec, W Jahn, H DLR (Germany)

ISBN: (纸本)0819425443

A small Bispectral Infrared Detection (BIRD) push broom scanner for a small satellite mission is described, which is dedicated to the detection and analysis of high temperature events (HTE). current operating and planned satellite sensors are not designed for high temperature event observation and therefore show some serious drawbacks such as saturation of the IR channels for target temperatures higher than 50 degrees C, low spatial resolution in case of daily coverage, low coverage of spatially high resolving systems, or not adequate IR channels. The BIRD instrumentation is a first attempt to overcome these disadvantages. For this purpose two infrared line scanners (3.4-4.2 mu m and 8.5-9.3 mu m) will be combined with a Wide Angle Stereo Scanner (WAOSS) in the visible. Because of the limited resources of a snail satellite the design of all instruments is based on the usage of staring focal plane arrays. To observe HTE directly the covered sounding area should be as large as possible whereas at first glance the ground resolution of the sensor should be in order of some 10 m. These demands ate in contradiction with the number of the infrared detector array elements currently available. For this reason methods of subpixel target detection and analysis have to be used. According to this concept a combination of the data from at least two radiometric high sensitive infrared sensor channels will be used to compensate the lack of high ground resolution. Adding to the infrared cameras a suitable CCD-line scanner for a pre-classification with a higher ground resolution, an markedly improvement can be achieved.

关键词： infrared push broom scanner focal plane arrays high temperature events subpixel target detection

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High butt-coupling efficiency to single mode fibers using a 1.55 /spl mu/m InGaAsP laser integrated with a tapered ridge mode transformer

High butt-coupling efficiency to single mode fibers using a ...

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IEEE Photonics conference (IPC)

作者： v. vusirikala S.S. Saini R.E. Bartolo R. Whaley S. Agrawala M. Dagenais F.G. Johnson D. Stone Department of Electrical Engineering and the Joint Program for Advanced Electronic Materials University of Maryland College Park MD USA Laboratory of Physical Science College Park MD USA

The 1.55 /spl mu/m wavelength window is important for future WDM systems, and hence there has been considerable interest in realizing mode expanded lasers at this wavelength. Here, we present a mode expanded laser based on a tapered ridge design, which was grown in a single epitaxial step, and required only conventional lithography and etching techniques. This device showed reduced far-field divergence angles and high coupling efficiencies to a standard cleaved single mode fiber (3.7 dB loss). To our knowledge, this is the lowest loss demonstrated in longer wavelength devices fabricated without using regrowth.

关键词： Fiber lasers Laser modes optical waveguides Threshold current optical coupling Waveguide lasers Etching Laser theory Educational institutions optical fiber communication

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Genetic algorithm and its application in lens design 6

Genetic algorithm and its application in lens design

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current developments in optical design and engineering vI conference

作者： Chen, XG Yamamoto, K Olympus Optical Co. Ltd. (Canada) Olympus Optical Co. Ltd. (Japan)

ISBN: (纸本)0819422517

Genetic algorithm and its application in lens design is studied. A new algorithm is presented which includes a genetic algorithm (GA) and damped least square (DLS) method. The convergence property of GA in lens design is demonstrated. A GA. generated design is obtained without artificial intervention. The aberration correction has to be done by DLS, and the result is close to the starting configuration generated by GA.

关键词： genetic algorithm lens design optimization

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New developments in beam induced current methods for the failure analysis of vLSI circuits

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MICROELECTRONIC engineering 1996年第1-4期31卷 57-67页

作者： Chan, DSH Phang, JCH Lau, WS Ong, vKS Sane, v Kolachina, S Osipowicz, T Watt, F Centre for Integrated Circuit Failure Analysis and Reliability Faculty of Engineering National University of Singapore 10 Kent Ridge Crescent Singapore 0511 Department of Physics Faculty of Science National University of Singapore 10 Kent Ridge Crescent Singapore 0511

Several new developments using beam induced current methods for the failure analysis of vLSI circuits will be reviewed in this paper. These include the development of a single contact electron beam induced current method (SCEBIC) which facilitates the collection of EBIC signals from vLSI circuits using only a single contact to the substrate, a complementary technique using a proton beam to access the active regions through multi-level metal layers and Tunneling current Microscopy (TCM) to distinguish oxide, substrate and oxide/substrate defects in very thin silicon dioxide films.

关键词： vLSI circuits

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Mirror mount bonding process for the COSTAR and STIS programs. 6

Mirror mount bonding process for the COSTAR and STIS program...

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current developments in optical design and engineering vI conference

作者： Buzzetta, v Ball Aerospace and Technologies Corp. (United States)

ISBN: (纸本)0819422517

This paper describes the process and methods to bond the Corrective Optics Space Telescope Axial Replacement and Space Telescope Imaging Spectrograph optics to their mounts. The optics on the two programs were all fabricated to .01 waves rms surface figure. These high quality optics for the Hubble Space Telescope required extreme care to mount. Since they must operate down to 1200 angstroms, contamination and minimizing surface distortion were serious concerns. The process produced excellent results. No significant surface distortion or contamination was induced.

关键词： optic mount bonding optics urethane adhesive Uv optics Hubble

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