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Thursday, August 6, 2020 | History

3 edition of Single-shot spectrally resolved UV Rayleigh scattering measurements in high speed flow found in the catalog.

Single-shot spectrally resolved UV Rayleigh scattering measurements in high speed flow

Single-shot spectrally resolved UV Rayleigh scattering measurements in high speed flow

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  • 26 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, D.C, Springfield, Va .
Written in English

    Subjects:
  • Flow measurement.,
  • Temperature measurement.,
  • Density measurement.,
  • Velocity measurement.,
  • Rayleigh scattering.

  • Edition Notes

    Other titlesSingle shot spectrally resolved UV Rayleigh scattering measurements in high speed flow
    StatementRichard G. Seasholtz.
    SeriesNASA technical memorandum -- 170323
    ContributionsUnited States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL17125510M

    Lidar: Range-Resolved Optical Remote Sensing of the Atmosphere Claus Weitkamp Written by leading experts in the field of Lidar, this book brings allthe recent applications and . The extended multiplicative signal correction (EMSC) preprocessing method allows a separation of physical light-scattering effects from chemical (vibrational) light absorbance effects in spectra from, for example, powders or turbid solutions. It is here applied to diffuse near infrared transmission (NIT) spectra of mixtures of wheat gluten (protein) and starch (carbohydrate) .

    The method makes single-shot imaging temperature measurements feasible in principle. This necessitates the use of two lasers having well-controlled bandwidths. (Since our original intention was to make single-shot imaging temperature measurements, two pulsed dye lasers tuned to and nm, respectively, were used in parallel. The first step is to remove the non-homogeneous spatial intensity distribution. As this contribution is stable, dividing the measurement of pulse 1 (left image in the figure 2) by the one obtained for pulse 2 (center image in the figure 2) results in a normalization of the spatial inhomogeneity's, what will be denoted from now on as the primary by:

    showed that the non-resonant inelastic X-ray scattering channel must be taken into account to describe the polariza-tion dependence of the vibrationally resolved spectra of O 2 (see Fig. 2) (Sun et al., ). The investigation of these fundamental aspects of the scattering process in small molecules is important for further. the keV spectral range. Time-resolved Thomson scattering measured the electronic density and temperature, and the rear-face self-emission diagnostic measured the shock speed. These hydrodynamic measurements allow to constrain the 1-D MULTI hydrocode. The atomic physics code FLYCHK is then used as a post-.


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Single-shot spectrally resolved UV Rayleigh scattering measurements in high speed flow Download PDF EPUB FB2

Single-Shot Spectrally Resolved UV Rayleigh Scattering Measurements in High Speed Flow Richard G. Seasholtz Lewis Research Center Cleveland, Ohio Prepared for the Eighth Intemational Symposium on Applications of Laser Techniques to Fluid Mechanics sponsored by the Instituto Superior T6cnico Lisbon, Portugal, JulyNational Aeronautics and.

Single-shot spectrally resolved UV Rayleigh scattering measurements in high speed flow (OCoLC) Material Type: Document, Government publication, National government publication, Internet resource: Document Type: Internet Resource, Computer File: All Authors / Contributors: Richard G Seasholtz; Lewis Research Center.

Single-shot spectrally resolved UV Rayleigh scattering measurements in high speed flow (OCoLC) Material Type: Government publication, National government publication, Internet resource: Document Type: Book, Internet Resource: All Authors / Contributors: Richard G Seasholtz; Lewis Research Center.

The flow fields of unheated, supersonic free jets from convergent and convergent-divergent nozzles operating at M =, and were measured. Seasholtz RG () Single-shot spectrally resolved UV Rayleigh scattering measurements in high-speed flow.

NASA TM, 8th International Symposium on Applications of Laser Techniques to Fluid Mechanics, Lisbon, PortugalCited by: 6. Mean and Fluctuating Property Measurements with Filtered Angularly Resolved Rayleigh Scattering Article in AIAA Journal 49(10) October with 9.

An example of a filtered Rayleigh scattering measurement is shown in Fig. Filtered Rayleigh scattering has become an important tool in order to pursue two-dimensional measurements in reaction flows, close to surfaces (~ µm) and has even been applied in.

How to cite this article: Zhuang, H. et al. High speed color imaging through scattering media with a large field of view. Sci. Rep. 6, ; doi: /srep ().Cited by: High repetition rate lasers and high-speed cameras can also be used for time-resolved measurements (high-speed PIV, see for example the review of Böhm et al.

for applications in turbulent combustion). Here, high repetition/sampling rates refers to the multi-kHz range, especially important for turbulent gas flows where 1–10 Hz sampling rates Cited by: A comprehensive experimental analysis needs therefore measurements of flow and scalar fields.

velocity, and temperature in turbulent high-speed air flows by UV Rayleigh scattering, Appl. Phys. B 51, 1–7 () Google Raman line imaging for spatially and spectrally resolved mole fraction measurements in internal combustion engines. Going beyond MHz-rate FRS flow visualizations and single-shot velocity measurements, Thurow et al.

have utilized a Nd:YAG pulse-burst laser (described previously) to obtain temporally resolved FRS velocimetry (or PDV) measurements from condensation particles in the Rayleigh regime. They used two high-speed CCD cameras at framing rates of Cited by: Single-shot time resolved Coherent Anti-Stokes Raman Scattering (CARS) is presented as a viable method for fast measurements of molecular spectra.

The method is based on the short spatial extension of femtosecond pulses and maps time delays between pulses onto the region of intersection between broad beams. The image of the emitted CARS signal contains full.

A novel high-speed imaging system capable of acquiring PLIF and elastic scattering images in a near-simultaneous fashion has been developed. A custom high-speed laser provided a nm beam that was used for elastic scattering and a nm beam that was used for LIF by:   We obtain single-shot time-resolved shadowgraph images of the electromagnetic fields resulting from the interaction of a high intensity ultrashort laser pulse with a metal surface.

Using a high brightness relativistic electron beam and a high streaking speed radiofrequency deflector, we report Cited by: Cross-correlation frequency-resolved optical gating with an angle-dithered nonlinear-optical crystal permits measurement of the intensity and the phase of the ultrabroadband (as much as nm wide) continuum generated from microstructure optical fiber.

Retrieval revealed fine-scale structure in the continuum spectrum. Simulations and single-shot spectrum. Unlike LIF, spontaneous Raman scattering (SRS) measurements in high pressure plasmas are not affected by quenching, the signal is proportional to the flow density, and multiple species (such as N 2 and O 2) can be probed at the same time.

SRS measurements in large-scale wind tunnels also have an advantage compared to CARS measurements since Cited by: Proc. SPIEOptical Measurement Systems for Industrial Inspection IX, (22 June ); doi: / Proc.

SPIEOptical Measurement Systems for Industrial Inspection XI, (8 August ); doi: / hidden behind scattering layers can be retrieved from the autocorrelation of a single high‐resolution scattered light image, captured by a standard camera, via iterative phase‐retrieval algorithms [16, 17].

The single‐shot technique benefits from a short acquisition time, which makes it possible to realize real ‐time by: Time Integrated Measurements Measurements of spectral emission are typically collected as time integrated, spectrally resolved or as spectral ly integra ted temporally resolved signals It has been shown by Carranza et.

that while iCCD cameras provide significantly more gain on the signal, CCD detectors provided a greater signal to noise. Title: Single-shot diffraction-limited imaging through scattering layers via bispectrum analysis.

Authors: Tengfei Wu, Ori Katz, Xiaopeng Shao, Sylvain Gigan (Submitted on 18 Aug ) Abstract: Recently introduced speckle-correlations based techniques enable noninvasive imaging of objects hidden behind scattering layers. In these techniques Cited by: Recent developments in high speed imaging and applications in speckle light Author(s): A single shot shearography device for simultaneous measurement in three shearing directions analysis of the agreement between scalar finite element simulation and pulsed TV-holography detection of the scattering of Rayleigh-Lamb waves in plates.

Inelastic X-ray scattering (IXS) is an important tool for studies of equilibrium dynamics in condensed matter. A new spectrometer recently proposed for ultra-high-resolution IXS (UHRIX) has achieved meV and nm −1 spectral and momentum-transfer resolutions, respectively.

However, further improvements down to meV and nm −1 are required to Cited by: 4.