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Key engineering materials
Trans Tech Publications Ltd.
Key engineering materials

Trans Tech Publications Ltd.

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1013-9826

Key engineering materials/Journal Key engineering materials
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    Principles for Echo Position Determination Using Airborne Ultrasound

    Georg KaniakHerbert Schweinzer
    P.258-262页
    查看更多>>摘要：Different approaches for determining the position of the reflection point of a transmitted ultrasound signal are investigated assuming a specular environment. Two different principles are outlined: one based on the evaluation of time of flight (TOF) differences at multiple receivers, the second on the evaluation of the directional characteristics of the ultrasound transducer itself. Experimental results are discussed as well as advantages that are gained by combining both methods.
      原文链接:
    • NETL
    • NSTL
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    A 3D Ultrasonic Positioning System with High Accuracy for Indoor Application

    Herbert F. SchweinzerGerhard F. Spitzer
    P.263-267页
    查看更多>>摘要：In the last years, a few Ultrasonic (US) positioning systems which are primarily directed at indoor tracking of mobile devices were presented. The US positioning system LOSNUS presented in this paper widens the application additionally supporting locating of static devices which can be numerously deployed communicating via a wired or wireless sensor network. However optimized for cheap realization, the system offers locating with high accuracy at medium high speed. The principle of operation, receiver design, and basic measurement results of reached accuracy are presented in the paper.
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    • NETL
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    THz-lmaging on its Way to Industrial Application

    Tilo PfeiferStephan Bichmann
    P.271-275页
    查看更多>>摘要：Terahertz radiation, which fills the gap between 100 GHz and 10 THz (λ = 30 μm - 3 mm) in the electro-magnetic spectrum, has seldom been used outside of astronomy and other scientific research. However, in recent years there has been a significant interest in investigating THz radiation for different new applications. Especially the ability of terahertz radiation to penetrate deep into many organic materials without the damage associated with ionizing radiation such as X-rays lead to recent interests chiefly in the fields of security technology and biomedical imaging. The attribute of many different materials to be transparent for terahertz radiation, was also the reason for many difficulties in practical applications outside of research. Using radiation that can pass through so many materials so well makes detection difficult. In addition, sources to generate light at terahertz frequencies have suffered from low output intensity and other problems. Since the 1990s, technical breakthroughs in sources and detectors have brought terahertz technology within striking distance of significant commercial markets [1]. The pressure to develop new terahertz sources arose from two dramatically different groups - ultrafast timedomain spectroscopists who wanted to work with longer wavelengths, and long wavelength radio astronomers who wanted to work with shorter wavelengths. Today there are continuous-wave (CW) sources available as well as pulsed sources [2]. The aim of this paper is to provide an overview of key scientific developments which currently represent the basics of the mentioned THz technology. Beginning with the working principle of opto-electronic THz sources and detectors, the paper explains different setups for transmitting and using THz radiation. Furthermore it shows different applications of different business branches and gives an outlook for industrial application in the fields of metrology and quality control.
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    • NETL
    • NSTL
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    Development and Characterization of Quasi-Optical Mesh Filters and Metastructures for Subterahertz and Terahertz Applications

    S.A. KuznetsovA.V. ArzhannikovV.V. KubarevP.V. Kalinin...
    P.276-280页
    查看更多>>摘要：We review our recent results on development of passive quasi-optical selective devices based on metallized subwavelength microstructure arrays designed for controlling radiation beams at frequencies from a few tens GHz up to ten THz: filters, polarizers, metasurfaces, ET-metamaterial lenses. The methods of electromagnetic simulation, technological implementation and (sub)THz-characterization of microstructure devices, as well as their applications, are discussed.
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    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Research on Terahertz Filters Employing the Effect of Frustrated Total Internal Reflection

    Aleksandra S. SyrnevaVladimir V. ChesnokovDimitry V. Chesnokov
    P.281-285页
    查看更多>>摘要：The optical filter under development employing frustrated total internal reflection is a micromechanical device containing two silicon rectangular prisms. There is flat silicon plane among hypotenuse edges of the prisms. The silicon plane is a Fabry-Perot resonator, with clearances h_1 among the plate and prism edges being its mirrors. Theoretical resolution of the optical filter would be R ≈ 1,5·10~3 if h_1 = 50 μm and R ≈ 3·10~5 if h_1 = 100 μm with the thickness of the silicon plane being h = 65 μm; wavelength X = 100 μm; free spectral region AX/λ ≈ 0,3...0,4, transmission in the maximum of spectral characteristics 0,6 (provided input and output silicon prism legs bloom).
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    • NETL
    • NSTL
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    Terahertz Fabry-Perot Interferometer Constructed by Metallic Meshes with Micrometer Period and High Ratio of Linewidth/Period

    Lu ZhengangTan JiubinFan Zhigang
    P.286-290页
    查看更多>>摘要：The possibility of constructing terahertz Fabry-Perot interferometer using metallic meshes with micrometer period and high ratio of linewidth/period is investigated, and the effectivity of traditional equivalent circuit method is verified by FDTD method. Simulation shows that the reflectance and transmittance of this kind of meshes calculated by equivalent circuit method have considerable deviation from those obtained by vector analysis of FDTD, so equivalent circuit method can be used to roughly evaluate the properties of this kind of metallic meshes. By using a metallic mesh with the period of 5 micrometers and the ratio of linewidth/period of 0.8, a finesse larger than 1100 can be achieved while the peak transmittance is still larger than 0.2 for a Fabry-Perot interferometer. It is therefore concluded that a high-quality terahertz Fabry-Perot interferometer can be constructed by using metallic meshes with micrometer period and high ratio of linewidth/period.
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    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Micromechanical Optical Scanner for Terahertz Spectrum Diapason

    Vladimir S. KorneyevVladimir V. ChesnokovDmitriy V. Chesnokov
    P.291-295页
    查看更多>>摘要：This paper considers the possibility of creation of a micromechanical optical scanner (MOEMS-scanner) for terahertz spectrum diapason of radiation frequencies.
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    Impact of Micro and Nano Sensors in Biomedical Measurement

    Peter Rolfe
    P.299-303页
    查看更多>>摘要：This paper reviews the ways in which micro and nano sensors have evolved within biology and medicine. The target measurands include an ever-increasing number of simple and complex molecules, physical quantities, and electrical and magnetic phenomena. Micro sensors based on electrochemical, acoustic, piezoelectric and optical principles are contributing to clinical care of patients who may benefit from the continuous monitoring of critical variables in intensive care or from the ability to perform convenient self-monitoring during normal daily life. Sensors constructed on the nano-scale are now emerging, especially for complex bio-molecules such as DNA. These are strengthening basic research, for example in the study of genetic factors in disease and for discovery of new drugs. Scanning probe technology and nano optics, including surface enhanced Raman spectroscopy, play important roles in these developments. Sensor science and technology has gained significant benefits through inspiration arising from biological sensory systems. This includes the sense of olfaction, which has led to the artificial nose, and the sense of vision that has been emulated in several versions of the artificial retina. The impact of micro and nano sensors on fundamental understanding in biomedicine and on clinical diagnosis and care are highlighted.
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    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Trends in Bragg Grating Technology for Optical Fiber Sensor Applications

    Hartmut Bartelt
    P.304-308页
    查看更多>>摘要：Fiber Bragg gratings have found widespread and successful applications in optical sensor systems, e. g. for temperature, strain or refractive index measurements. Such sensor elements are fiber integrated, are applicable under harsh environmental conditions, and can be easily multiplexed. In order to further extend the field of applications, there is a great interest in specifically adapted Bragg gratings, in Bragg grating structures with increased stability, or in the use of special fiber types for grating inscription. The paper discusses such specific concepts for grating inscription, covers novel aspects of fiber gratings in small diameter fibers or in fiber tapers, of gratings in pure silica fibers without UV sensitivity, of grating inscription in different microstructured fibers or photonic crystal fibers, and investigates the concept of femtosecond inscription and the extension of the Bragg reflection wavelengths down to the visible range.
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    • NETL
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    Comparison of Raman and Fiber Bragg Grating-Based Fiber Sensor Systems for Distributed Temperature Measurements

    Sergey A. BabinAlexey G. KuznetsovIvan S. Shelemba
    P.309-313页
    查看更多>>摘要：Two types of distributed fiber sensor systems for temperature measurements have been developed: the first one is multi-point Fiber Bragg Grating based system with interrogation by CW tunable laser and nonlinearity compensation by reference interferometer. The second device is Raman scattering system based on optical time domain reflectometry (OTDR) with a pulsed laser providing spatial resolution of several meters and efficient spectral filtering of the Stokes and anti-Sokes signals by means of WDM couplers. Physical effects important for the systems operation are analyzed and their parameters are compared and optimized for applications in oil-gas industry and turbogenerator temperature monitoring.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd