Results 31 to 40 of about 84,280 (228)
Optics Letters, 1998 A method is reported for time- and space-resolved nonintrusive velocimetry of high-speed gas flows by measurement of the Doppler shift of light scattered from a laser-induced thermal grating. The principle is demonstrated by use of a pulsed frequency-doubled Nd:YAG laser to induce a thermal grating in NO(2) seeded into an argon flow.
Walker, D, Williams, R, Ewart, P
openaire +2 more sources
APL Photonics, 2023 Laser Doppler velocimetry has developed as a powerful enabling technology within a myriad of realistic scenarios. While existing toolkits that exploit optical vortex allow access to longitudinal linear velocimetry and/or transverse rotational velocimetry
Yanxiang Zhang +3 more
doaj +1 more source
Particle image velocimetry technique for analysis of retractibility in woods of Pinus elliottii
Maderas: Ciencia y Tecnología, 2021 The aim of this work was to verify the ability to use the Particle Image Velocimetry technique for measurements of dimensional variations resulting from wood retractability of Pinus elliottii wood, initially saturated and with the surface marked with ...
Eduardo Hélio de Novais Miranda +4 more
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Drones, 2019 Stream velocity and flow are very important parameters that must be measured accurately to develop effective water resource management plans. There are various methods and tools to measure the velocity but, nowadays, image-based methods are a promising ...
Paschalis Koutalakis +2 more
doaj +1 more source
Squids use multiple escape jet patterns throughout ontogeny
Biology Open, 2020 Throughout their lives, squids are both predators and prey for a multitude of animals, many of which are at the top of ocean food webs, making them an integral component of the trophic structure of marine ecosystems.
Carly A. York +3 more
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Maderas: Ciencia y Tecnología, 2021 Non-destructive techniques for characterizing materials in-service have been increasing in importance. Thus, it is relevant to assess the potential of non-destructive techniques for solid materials. This work aimed to determine the modulus of elasticity
Eduardo Hélio de Novais Miranda +5 more
doaj +1 more source
Single camera 3D planar Doppler velocity measurements, using two frequency planar Doppler velocimetry (2v-PDV) and imaging fibre bundles [PDF]
, 2006 A modified Planar Doppler Velocimetry (PDV) technique, two frequency PDV (2v-PDV), is described that allows measurements of the velocity field over a plane defined by a laser light sheet using sequential illumination of the flow with two closely ...
Charrett, Thomas O. H. +2 more
core +1 more source
Defocusing digital particle image velocimetry and the three-dimensional characterization of two-phase flows [PDF]
, 2002 Defocusing digital particle image velocimetry (DDPIV) is the natural extension of planar PIV techniques to the third spatial dimension. In this paper we give details of the defocusing optical concept by which scalar and vector information can be ...
Gharib, Morteza, Pereira, Francisco
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Far-Field Plasmonic Resonance Enhanced Nano-Particle Image Velocimetry within a Micro Channel
, 2010 In this paper, a novel far-field plasmonic resonance enhanced nanoparticle-seeded Particle Image Velocimetry (nPIV) has been demonstrated to measure the velocity profile in a micro channel.
Bruun H. H. +6 more
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MetrologyPhotoacoustic (PA) velocimetry offers a promising solution to the limitations of conventional techniques for measuring blood flow velocity. Given its moderate penetration depth and high spatial resolution, PA imaging is considered suitable for measuring ...
Haruka Tsuboi +2 more
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