Laser-Induced Thermal Acoustics (LITA): Four-Wave Mixing Measurement of Sound Speed, Thermal Diffusivity, and Viscosity

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ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis Laser-Induced Thermal Acoustics (LITA): Four-Wave Mixing Measurement of Sound Speed, Thermal Diffusivity, and Viscosity by :

Download or read book Laser-Induced Thermal Acoustics (LITA): Four-Wave Mixing Measurement of Sound Speed, Thermal Diffusivity, and Viscosity written by and published by . This book was released on 1994 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser-induced thermal acoustics (LITA) is a promising optical four- wave mixing technique for gasdynamic measurement. The X(3) nonlinear process is a sequence of two opto-acoustic effects, electrostriction and absorption/rapid- thermalization, and the acousto-optic effect. The evolution of the laser-induced acoustic structures temporally modulates X(3) and thereby the LITA signal. Time resolution of the signal provides the sound speed, thermal diffusivity, and acoustic damping rate, along with information about atomic or molecular energy transfer rates. LITA can also measure spectra of both the real and imaginary gas susceptibility. The physics of LITA is discussed and the derivation is sketched of a simple analytical expression that accurately describes both the magnitude and time history of the LITA signal. Early experimental results are presented. Sound speeds accurate to 0.5% and transport properties accurate to 30% have been measured in a single-shot without calibration. More realistic modeling should dramatically improve transport-property measurement. LITA spectra have been taken of weak spectral lines of NO2 in concentrations less than 50 ppb. Signal reflectivities as high as 0.0001 have been estimated. New applications of LITA, including velocimetry, are suggested. LITA, Four-wave mixing, Thermal grating, Single-shot measurement, Velocimetry.

Scientific and Technical Aerospace Reports

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ISBN 13 :
Total Pages : 692 pages
Book Rating : 4.:/5 (3 download)

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Book Synopsis Scientific and Technical Aerospace Reports by :

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Laser-induced Thermal Acoustics

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ISBN 13 :
Total Pages : 176 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis Laser-induced Thermal Acoustics by : Eric B. Cummings

Download or read book Laser-induced Thermal Acoustics written by Eric B. Cummings and published by . This book was released on 1995 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Proceedings of the International Conference on Lasers

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ISBN 13 :
Total Pages : 776 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Proceedings of the International Conference on Lasers by :

Download or read book Proceedings of the International Conference on Lasers written by and published by . This book was released on 1993 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Interaction of Chemistry, Turbulence and Shock Waves in Hypervelocity Flow

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ISBN 13 :
Total Pages : 68 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Interaction of Chemistry, Turbulence and Shock Waves in Hypervelocity Flow by : G. V. Candler

Download or read book Interaction of Chemistry, Turbulence and Shock Waves in Hypervelocity Flow written by G. V. Candler and published by . This book was released on 1994 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Laser Diagnostics for Combustion Temperature and Species

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Publisher : CRC Press
ISBN 13 : 9789056995324
Total Pages : 636 pages
Book Rating : 4.9/5 (953 download)

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Book Synopsis Laser Diagnostics for Combustion Temperature and Species by : Alan C. Eckbreth

Download or read book Laser Diagnostics for Combustion Temperature and Species written by Alan C. Eckbreth and published by CRC Press. This book was released on 1996-10-10 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt: Focusing on spectroscopically-based, spatially-precise, laser techniques for temperature and chemical composition measurements in reacting and non-reacting flows, this book makes these powerful and important new tools in combustion research

Government Reports Announcements & Index

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ISBN 13 :
Total Pages : 696 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Government Reports Announcements & Index by :

Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1995 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Optical Measurement of the Speed of Sound in Air Over the Temperature Range 300-650 K

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ISBN 13 :
Total Pages : 12 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Optical Measurement of the Speed of Sound in Air Over the Temperature Range 300-650 K by : Roger C. Hart

Download or read book Optical Measurement of the Speed of Sound in Air Over the Temperature Range 300-650 K written by Roger C. Hart and published by . This book was released on 2000 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using laser-induced thermal acoustics (LITA), the speed of sound in room air (1 atm) is measured over the temperature range 300-650 K Since the LITA apparatus maintains a fixed sound wavelength as temperature is varied, this temperature range simultaneously corresponds to a sound frequency range 10-15 MHz. The data are compared to a published model and typically agree within 0.1-0.4% at each of 21 temperatures.

Simultaneous Velocimetry and Thermometry of Air Using Nonresonant Heterodyne Laser-induced Thermal Acoustics

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ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Simultaneous Velocimetry and Thermometry of Air Using Nonresonant Heterodyne Laser-induced Thermal Acoustics by :

Download or read book Simultaneous Velocimetry and Thermometry of Air Using Nonresonant Heterodyne Laser-induced Thermal Acoustics written by and published by . This book was released on 2000 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Acoustic, Thermal Wave and Optical Characterization of Materials

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Publisher : Elsevier
ISBN 13 : 044459664X
Total Pages : 413 pages
Book Rating : 4.4/5 (445 download)

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Book Synopsis Acoustic, Thermal Wave and Optical Characterization of Materials by : G.M. Crean

Download or read book Acoustic, Thermal Wave and Optical Characterization of Materials written by G.M. Crean and published by Elsevier. This book was released on 2014-08-04 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume focuses on a variety of novel non-destructive techniques for the characterization of materials, processes and devices. Emphasis is placed on probe-specimen interactions, in-situ diagnosis, instrumentation developments and future trends. This was the first time a symposium on this topic had been held, making the response particularly gratifying. The high quality of the contributions are a clear indication that non-destructive materials characterization is becoming a dynamic research area in Europe at the present time.A selection of contents: The role of acoustic properties in designs of acoustic and optical fibers (C.K. Jen). Observation of stable crack growth in Al2O3 ceramics using a scanning acoustic microscope (A. Quinten, W. Arnold). Mechanical characterization by acoustic techniques of SIC chemical vapour deposited thin films (J.M. Saurel et al.). Efficient generation of acoustic pressure waves by short laser pulses (S. Fassbender et al.). Use of scanning electron acoustic microscopy for the analysis of III-V compound devices (J.F. Bresse). Waves and vibrations in periodic piezoelectric composite materials (B.A. Auld). Precision ultrasonic velocity measurements for the study of the low temperature acoustic properties in defective materials (A. Vanelstraete, C. Laermans). Thermally induced concentration wave imaging (P. Korpiun et al.). Interferometric measurement of thermal expansion (V. Kurzmann et al.). Quantitative analyses of power loss mechanisms in semiconductor devices by thermal wave calorimetry (B. Büchner et al.). Thermal wave probing of the optical electronic and thermal properties of semiconductors (D. Fournier, A. Boccara). Thermal wave measurements in ion-implanted silicon (G. Queirola et al.). Optical-thermal non-destructive examination of surface coatings (R.E. Imhof et al.). Bonding analysis of layered materials by photothermal radiometry (M. Heuret et al.). Thermal non-linearities of semiconductor-doped glasses in the near-IR region (M. Bertolotti et al.). Theory of picosecond transient reflectance measurement of thermal and eisatic properties of thin metal films (Z. Bozóki et al.). The theory and application of contactless microwave lifetime measurement (T. Otaredian et al.). Ballistic phonon signal for imaging crystal properties (R.P. Huebener et al.). Determination of the elastic constants of a polymeric Langmuir-Blodgett film by Briliouin spectroscopy (F. Nizzoli et al.). Quantum interference effects in the optical second-harmonic response tensor of a metal surface (O. Keller). Study of bulk and surface phonons and plasmons in GaAs/A1As superlattices by far-IR and Raman spectroscopy (T. Dumslow et al.). Far-IR spectroscopy of bulk and surface phonon-polaritons on epitaxial layers of CdTe deposited by plasma MOCVD on GaAs substrates (T. Dumelow et al.). In-situ characterization by reflectance difference spectroscopy of III-V materials and heterojunctions grown by low pressure metal organic chemical vapour deposition (O. Acher et al.). Optical evidence of precipitates in arsenic-implanted silicon (A. Borghesi et al.). Polarized IR reflectivity of CdGeAs2 (L. Artús et al.). Raman and IR spectroscopies: a useful combination to study semiconductor interfaces (D.R.T. Zahn et al.). Silicon implantation of GaAs at low and medium doses: Raman assessment of the dopant activation (S. Zakang et al.). Ellipsometric characterization of thin films and superlattices (J. Bremer et al.). Ellipsometric characterization of multilayer transistor structures (J.A. Woollam et al.). Quality of molecular-beam-epitaxy-grown GaAs on Si(100) studied by ellipsometry (U. Rossow et al.). An ellipsometric and RBS study of TiSi2 formation (J.M.M. de Nijs, A. van Silfhout). A new microscope for semiconductor luminescence studies (P.S. Aplin, J.C. Day). Structural analysis of optical fibre preforms fabricated by the sol-gel process (A.M. Elas et al.). Author index.

Applied Optics

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ISBN 13 :
Total Pages : 332 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis Applied Optics by :

Download or read book Applied Optics written by and published by . This book was released on 1999 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Temperature and Pressure Dependence of Signal Amplitudes for Electrostriction Laser-Induced Thermal Acoustics

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Publisher : Independently Published
ISBN 13 : 9781794248335
Total Pages : 32 pages
Book Rating : 4.2/5 (483 download)

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Book Synopsis Temperature and Pressure Dependence of Signal Amplitudes for Electrostriction Laser-Induced Thermal Acoustics by : National Aeronautics and Space Adm Nasa

Download or read book Temperature and Pressure Dependence of Signal Amplitudes for Electrostriction Laser-Induced Thermal Acoustics written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2019-01-18 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The relative signal strength of electrostriction-only (no thermal grating) laser-induced thermal acoustics (LITA) in gas-phase air is reported as a function of temperature T and pressure P. Measurements were made in the free stream of a variable Mach number supersonic wind tunnel, where T and P are varied simultaneously as Mach number is varied. Using optical heterodyning, the measured signal amplitude (related to the optical reflectivity of the acoustic grating) was averaged for each of 11 flow conditions and compared to the expected theoretical dependence of a pure-electrostriction LITA process, where the signal is proportional to the square root of [P*P /( T*T*T)]. Herring, Gregory C. Langley Research Center NASA/TM-2015-218762, L-20562, NF1676L-21439

Experimental Considerations for Laser-induced Thermal Acoustics (LITA) in Compressible Turbulent Flows

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)

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Book Synopsis Experimental Considerations for Laser-induced Thermal Acoustics (LITA) in Compressible Turbulent Flows by : Stefan Schlamp

Download or read book Experimental Considerations for Laser-induced Thermal Acoustics (LITA) in Compressible Turbulent Flows written by Stefan Schlamp and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Laser-induced Thermal Acoustics

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ISBN 13 : 9783843929738
Total Pages : pages
Book Rating : 4.9/5 (297 download)

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Book Synopsis Laser-induced Thermal Acoustics by : Felix Johannes Förster

Download or read book Laser-induced Thermal Acoustics written by Felix Johannes Förster and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Future Development for Laser-Induced Thermal Acoustics

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ISBN 13 :
Total Pages : 6 pages
Book Rating : 4.:/5 (742 download)

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Book Synopsis Future Development for Laser-Induced Thermal Acoustics by :

Download or read book Future Development for Laser-Induced Thermal Acoustics written by and published by . This book was released on 2002 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of novel flow diagnostic techniques typically proceeds in certain stages from a proof of principle in a laboratory to a commercial product either for use in industry or as turn-key research tool. While the first usable versions are brought to market, further progress is made in the laboratory by improvements, refinements, and extensions of the technique. Consider Particle Image Velocimetry (PIV), which started by double-exposing a photographic film with the image of an illuminated particle-laden flow and where today turn-key, off-the-shelf CCD systems are available for purchase, which include the necessary data analysis software. At the same time, 3d PIV, dual-plane PIV, Doppler Global Velocimetry (DGV), etc. are being used in laboratories and will doubtless be available as integrated systems in the near future. In this paper, the origin, an overview over the current status and an outlook on the future potential of Laser-Induced Thermal Acoustics (LITA) will be given, where the focus will be on the possible technique extensions to other than the current applications. As such, it represents a collection of ideas and avenues for future research, which have not been applied as of yet, but are conceptually feasible.

Photoacoustic, Photothermal and Photochemical Processes at Surfaces and in Thin Films

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Publisher : Springer Science & Business Media
ISBN 13 : 3642839452
Total Pages : 385 pages
Book Rating : 4.6/5 (428 download)

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Book Synopsis Photoacoustic, Photothermal and Photochemical Processes at Surfaces and in Thin Films by : Peter Hess

Download or read book Photoacoustic, Photothermal and Photochemical Processes at Surfaces and in Thin Films written by Peter Hess and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: Review articles by leading scientists in their fields are brought together in this volume to provide a comprehensive treatment of photoacoustic, photothermal and photochemical processes at surfaces and in thin films. The articles introduce the fields, review present knowledge and conclude with latest developments and future prospects. Topics covered include laser-induced desorption, ablation and surface damage; surface acoustic waves; photothermal and photoacoustic characterization of thin films and interfaces; depth profiling in the frequency and time domains; remote testing and nondestructive evaluation; materials characterization; and new theoretical approaches using fractals. The book will interest newcomers to photoacoustics, since it gives an overview of current research and details of experimental methods. It will also be a source of information for those already in the field due to its clear presentation of theory and experimental results. All relevant literature references in this rapidly expanding field are included.

Laser-induced Thermal Acoustic Velocimetry

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ISBN 13 :
Total Pages : 119 pages
Book Rating : 4.:/5 (182 download)

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Book Synopsis Laser-induced Thermal Acoustic Velocimetry by : Stefan Schlamp

Download or read book Laser-induced Thermal Acoustic Velocimetry written by Stefan Schlamp and published by . This book was released on 2000 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt: