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Infrared and Millimeter Waves and 13th International Conference on Terahertz Electronics, 2005. IRMMW-THz 2005. The Joint 30th International Conference on

Date 19-23 Sept. 2005

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  • [Cover]

    Publication Year: 2005 , Page(s): C1
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  • Copyright page

    Publication Year: 2005 , Page(s): C2
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  • Transmission characteristics of NRD guide as a transmission medium in THz frequency band

    Publication Year: 2005 , Page(s): 331 - 332 vol. 2
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    The NRD guide is a promising candidate for a millimeter-wave transmission media. In this paper, the NRD guide was theoretically designed at THz frequencies and its performance was evaluated from the viewpoint of transmission characteristics. At first, polyethylene with a relative dielectric constant of 2.3 was selected as a material of the dielectric strip, and the transmission loss was calculated as functions of loss tangent of the dielectric strip and conductivity of the metal plate. It was found that the transmission loss of the NRD guide was lower than that of the coplanar waveguide, presented in several reports, because the transmission loss of the NRD guide was 1 dB/mm on average at a frequency of 1.5 THz. View full abstract»

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  • Spatial frequency filter for real-time THz imaging

    Publication Year: 2005 , Page(s): 333 - 334 vol. 2
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    In real-time THz imaging using intense broadband THz pulses, low-frequency THz components degrade the contrast and resolution of the THz images. We improved the contrast by spatially filtering out low-frequency components using the frequency dependence of the beam waist size of a focused THz beam. View full abstract»

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  • Far-infrared dynamics probed by terahertz pulses

    Publication Year: 2005 , Page(s): 335 - 336 vol. 2
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    Optical pump-teraHertz probe spectroscopy is used for investigation of photo-initiated dynamics in semiconductors. The transient far-infrared conductivity spectra are evaluated from measured THz waveforms and interpreted within a developed phenomenological framework methodological aspects are stressed in this contribution. View full abstract»

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  • Terahertz imaging and holography with a high-power free electron laser

    Publication Year: 2005 , Page(s): 337 - 338 vol. 2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2088 KB) |  | HTML iconHTML  

    In this paper we describe the terahertz imagers which characteristics are adequate for measurement of high power terahertz radiation. Three imaging techniques were employed on the Novosibirsk terahertz free electron laser (NFEL): near-infrared thermograph, thermosensitive visible light interferometer, and "a thermal image plate". All this methods are widely used in experiments with NFEL radiation. As examples, we present here the measurements of laser beam coherence and describe experiments on terahertz holography. View full abstract»

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  • Investigation on nondestructive evaluation of pipelines using infrared thermography

    Publication Year: 2005 , Page(s): 339 - 340 vol. 2
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1792 KB) |  | HTML iconHTML  

    Different kinds of defects in the pipeline heat insulation layer (PHIL), both in the inner and outer sides, and leakage holes of the pipeline, with or without PHIL, are made artificially and studied using infrared thermography. The detectability of the defect in the PHIL and the leakage of the pipeline are investigated and the relationships between the maximum temperature of the defects in the thermal images and the depth and size of the defects in the PHIL are also studied. In addition, the practical inspection work is done to a boiler system of a warship. Both the simulated study in the lab and the practical applications have certified the effectiveness of thermography. View full abstract»

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  • A general quantitative identification algorithm of subsurface defect for infrared thermography

    Publication Year: 2005 , Page(s): 341 - 342 vol. 2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (432 KB) |  | HTML iconHTML  

    Based on the Levenberg-Marquardt (L-M) method, a new general algorithm of estimating the size, depth and thermal conductivity of the subsurface defect according the surface temperature distribution obtained by passive, steady-state thermography is presented. The numerical experimental results show that the precise size, depth and the thermal conductivity of the defect can be estimated with or without the consideration of the temperature measurement error; and the larger the maximum temperature difference at the inspection surface, the higher the precision level of the identification results. The algorithm can be used to estimate the subsurface defect directly based on the thermal image or as part of the post-processing module in the infrared sensor system. View full abstract»

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  • Raman scattering in ZnMnO prepared by ion implantation

    Publication Year: 2005 , Page(s): 343 - 344 vol. 2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (336 KB) |  | HTML iconHTML  

    ZnMnO has been successfully prepared by high-dose Mn implantation into ZnO crystal. The influence of implantation and annealing on ZnMnO Raman spectra has been investigated. The E2 mode weakens, broadens and red-shifts after the implantation, while the A1(LO) mode intensifies, broadens and red-shifts. After thermal annealing a new mode at 528 cm-1 shows up. With the recursion method calculation this new mode is attributed to the softening of Zn-O vibration caused by Mn incorporation. View full abstract»

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  • The effect analysis of thermal reference resource performance in the high sensitive infrared scanner

    Publication Year: 2005 , Page(s): 345 - 346 vol. 2
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    The high sensitive infrared scanner is a useful way in the shoal label. The thermal reference resource (TRR) is a temperature controlled blackbody which is overfilled to the clear aperture in the scanner. The effect of TRR performance to the system detect ability is analyzed in detail in the paper. View full abstract»

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  • Polarization stereoradiovision in the MM wavelength region

    Publication Year: 2005 , Page(s): 347 - 348 vol. 2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1800 KB) |  | HTML iconHTML  

    Experimental two linear polarization thermal images of auto-tractor equipment at 3mm wavelength which were formed in the wave zone of lens antenna with diameter 0.6 m are presented. Advantages of polarization stereoradiovision and a priory methods of image spatial resolution reconstruction when the goal is determination parameters and geometrical shape of object dielectric details are discussed. View full abstract»

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  • Vehicle classification by vibration analysis using millimeterwave sensors

    Publication Year: 2005 , Page(s): 349 - 350 vol. 2
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1576 KB) |  | HTML iconHTML  

    Vibration signatures of battlefield vehicles are strong criteria to discriminate real targets and decoys (Ebert, 2002). To implement vibration detection in a fire control radar system, it is important to analyse the behaviour of vibration signatures over a respective frequency range. This paper shows the first results of a pilot study which analyses vibration signatures of real battlefield targets at 10 GHz, 35 GHz and 94GHz. View full abstract»

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  • Progress of CW and short-pulse calorimetric loads for high power millimeter-wave beams

    Publication Year: 2005 , Page(s): 351 - 352 vol. 2
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1816 KB) |  | HTML iconHTML  

    A family of compact matched loads for high power millimeter wavelength beams absorption, good for atmospheric and vacuum operation, suited for CW (1MW) or short pulses (2MW, 0.ls) precise measurement has been designed to test high power gyrotrons. The common origin for members of this family is a toad developed for the ECRH FTU plant (140 GHz, 0.5 s, 0.5 MW) and successfully exploited. A CW version of the load has been built and used as absorber and bolometer for the high-power test of a remote steering launcher mock-up at 140 GHz. The high-power tests have been performed with powers up to 700 kW and pulse lengths of up to 10 seconds without limitation due to the load. An investigation of the gas emission properties of the load coating material at high temperature and under vacuum has been accomplished by means of high power deposition from an electron gun. Results from these tests are presented. View full abstract»

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  • Application of millimeter wave sensors for security purposes

    Publication Year: 2005 , Page(s): 353 - 354 vol. 2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1632 KB) |  | HTML iconHTML  

    Applications of various sensors for security purposes in the millimeter wave band provides their functioning at low visibility. Two types of sensors are considered, including the superposed sensor (radar type) and the spaced sensor (electronic fence type). The sensor development, wave propagation at surface paths, and their exploitation in real situations are presented. View full abstract»

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  • COBRA 94 - ultra broadband experimental radar for ISAR applications

    Publication Year: 2005 , Page(s): 355 - 356 vol. 2
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1624 KB) |  | HTML iconHTML  

    For airborne reconnaissance day/night/all-weather capability and high resolution of imaging radar sensors is mandatory. For the development of related processing algorithms an experimental, polarimetric 94-GHz radar has been developed using a FM/CW waveform with a bandwidth of 4000 MHz resulting in a resolution < 4 cm. The radar has been tested using the method of Inverse Synthetic Aperture in tower/turntable geometry. To be able to derive ISAR images with the full theoretically achievable resolution, a fast polar reformatting process was developed and tested with the data. View full abstract»

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  • Diamond gyrotron windows at the DIII-D tokamak

    Publication Year: 2005 , Page(s): 357 - 358 vol. 2
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    New thermal calculations have been performed for artificially grown diamond output windows produced by chemical vapor deposition (CVD) installed on 110 GHz 1 MW gyrotrons. These results can be compared with infrared (IR) monitoring of the windows during 5 s pulses. A new prototype depressed collector gyrotron with output power in excess of 1.0 MW at 110 GHz is expected to be tested to full parameter operation at the DIII-D facility. Predicted maximum temperature and temperature profiles are presented based on the characteristics of the particular diamond disk installed on this gyrotron and the model. View full abstract»

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  • The first astronomical mm and submm observations with multi-Fourier transform interferometer

    Publication Year: 2005 , Page(s): 359 - 360 vol. 2
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1048 KB) |  | HTML iconHTML  

    We report a success of the first astronomical mm and submm observations with multi-Fourier transform interferometer (MuFT). Several merits of MuFT are presented using the observational and experimental results. In this paper, the preliminary results are also shown. View full abstract»

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  • Quasi-optical millimetre-wave imaging with bio-medical applications

    Publication Year: 2005 , Page(s): 361 - 362 vol. 2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1776 KB) |  | HTML iconHTML  

    We report on millimeter-wave imaging systems being developed for both near-field analysis and quasi-optical image processing. As well as simple near field transmission, we also consider Gaussian beam mode telescope based imaging, which utilizes spatial filtering techniques from Fourier optics, for the imaging of biological samples and other applications. We also report on near-field wave-front reconstruction techniques from holography and show how the techniques can also be used for imaging the phase centre of nonstandard feed antennas. Finally, we briefly summarise progress on the development of Fourier gratings as a method for producing multiple images of a coherent local oscillator source. Such schemes will be necessary for the development of inexpensive multiplexers for heterodyne detection schemes for sensitive array imagers and cameras. View full abstract»

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  • Analysis of a Fabry-Perot open resonator

    Publication Year: 2005 , Page(s): 363 - 364 vol. 2
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    A numerical simulation has been carried out on a Fabry-Perot open resonator excited through a beam splitter and loaded with a plate. The results show that, while the influence of the beam splitter is negligible when the plate is resonant, the beam splitter plays a very important role in measuring an off-resonance plate of a low loss material. View full abstract»

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  • Beam optics analysis

    Publication Year: 2005 , Page(s): 365 - 366 vol. 2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1760 KB) |  | HTML iconHTML  

    Beam optics analysis is currently being used to design multiple beam and sheet beam electron guns and collectors. The advanced graphical user interface and adaptive meshing provide a powerful, user-friendly design tool for simulating complex geometries. Characteristics of the design code are predicted as well as integration of computer optimization routines. View full abstract»

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  • 3D imaging system based on FMCW millimeter wave radar

    Publication Year: 2005 , Page(s): 367 - 368 vol. 2
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1040 KB) |  | HTML iconHTML  

    3D radar imaging systems are highly requested for use in guidance system for aircraft landing and shipping navigation. These systems usually work in difficult weather conditions such as fog, snow, dust. Use of 3-mm wavelength FMCW radar allows getting images at distances up to 1000m with high spatial resolution. View full abstract»

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  • Design of a wideband 140 GHz, 1 kW gyro-amplifier

    Publication Year: 2005 , Page(s): 369 - 370 vol. 2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1680 KB) |  | HTML iconHTML  

    The design and simulation results for a 140 GHz, 1 kW gyro-amplifier are presented. A bandwidth of over 1 GHz is required at a saturated gain of 50 dB. The operating mode will be the TE(0,2) mode and distributed loss is employed to stabilize the circuit. The amplifier is capable of amplifying short pulses on the nanosecond scale. View full abstract»

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  • Tuneable FEM system as a plasma source for biological applications

    Publication Year: 2005 , Page(s): 371 - 372 vol. 2
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    There is increasing interest in the use of microwave power for industrial applications. A pulsed tuneable microwave source is beneficial as it allows the high electromagnetic field of a high power to be applied to a target without excessive heating. The free electron maser (FEM) is the tuneable source with ability to operate across a wide range of frequencies from 8 to 20 GHz. Using higher frequencies than the common 2.45 magnetron, increases the fields obtained and also beneficial scaling effects on some applications, such as microwave induced plasmas. The paper presents the basic principles of the FEM system as well as the applications of UV. View full abstract»

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  • Mode converter design for coaxial gyrotrons

    Publication Year: 2005 , Page(s): 373 - 374 vol. 2
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1056 KB) |  | HTML iconHTML  

    This paper describes the peculiarities of mode converters of coaxial cavity gyrotrons. The high order and the characteristic field pattern of these modes makes it difficult to design a quasi-optical mode converter with a dimpled wall launcher and (possibly) Yeti-footprint-mirrors. Methods and design strategies to overcome these difficulties are presented. View full abstract»

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  • Development of the material processing system by using a 300 GHz gyrotron

    Publication Year: 2005 , Page(s): 375 - 376 vol. 2
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1544 KB) |  | HTML iconHTML  

    An increase in the frequency of microwave used for the processing of materials has a great potential for the applications. We developed the material heating system by using a 300GHz gyrotron. This system are consisted of a 300 GHz, 3.5 kW, CW gyrotron with a cryogen free 12 T superconducting magnet, a corrugated circular waveguide and an applicator. The circular corrugated waveguide (i.d. = 6.35cm) with a corrugated period and depth of 254 μm have been designed. The applicator have been designed both volumetric heating by uniformly distributed microwave and surface heating by a focused wave beam. View full abstract»

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