Extreme measurements with Photonic Doppler Velocimetry (PDV)
نویسندگان
چکیده
منابع مشابه
Effect of window reflections on photonic Doppler velocimetry measurements.
Photonic Doppler velocimetry (PDV) has rapidly become a standard diagnostic for measuring velocities in dynamic compression research. While free surface velocity measurements are fairly straightforward, complications occur when PDV is used to measure a dynamically loaded sample through a window. Fresnel reflections can severely affect the velocity and time resolution of PDV measurements, especi...
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The work presented here describes a method that allows three component velocity measurements to be made, quickly and non-intrusively, across a plane in a flow defined by a laser light sheet. The method, two frequency planar Doppler Velocimetry (2ν-PDV) is a modification of the Planar Doppler Velocimetry (PDV) technique, using only a single CCD camera, and sequential illumination of the flow usi...
متن کاملSingle camera 3D planar Doppler velocity measurements, using two frequency Planar Doppler Velocimetry (2ν-PDV) and imaging fibre bundles
A modified Planar Doppler Velocimetry (PDV) technique, two frequency PDV (2-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 separated (~1GHz) frequencies of laser light. This allows a common-path imaging head to be used containing a single CCD camera instead of the usual cam...
متن کاملAccuracy and precision in photonic Doppler velocimetry.
While photonic Doppler velocimetry (PDV) is becoming a common diagnostic in dynamic compression research, its limiting accuracy and precision are not well understood. Velocity resolution is known to be inversely proportional to the time resolution, but resolution estimates differ by one to two orders of magnitude. Furthermore, resolution varies with the number of recorded signals and how these ...
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A periodic shading mechanism (about 0.5 s period) is believed to be used by flagellated algae to detect light direction. Time changes in the orientation of a population of Haematococcus pluvialis under positive photoaxis conditions (cell samples were stimulated alternatively by two diametrically opposed beams of actinic light), have been investigated by analysing the Doppler shifts of laser lig...
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ژورنال
عنوان ژورنال: Review of Scientific Instruments
سال: 2020
ISSN: 0034-6748,1089-7623
DOI: 10.1063/5.0004363