Two-frequency planar Doppler velocimetry (2ν-PDV)

Single camera three component planar velocity measurements, using two frequency Planar Doppler Velocimetry (2ν-PDV)

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...

Single 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...

Frequency division multiplexing for interferometric planar Doppler velocimetry.

A new method of acquiring simultaneously the signal and reference channels used for interferometric planar Doppler velocimetry is proposed and demonstrated. The technique uses frequency division multiplexing (FDM) to facilitate the capture of the requisite images on a single camera, and is suitable for time-averaged flow measurements. Furthermore, the approach has the potential to be expanded t...

Single camera 3D planar Doppler velocity measurements using imaging fibre bundles

Two frequency planar Doppler Velocimetry (2ν-PDV) is a modification of the Planar Doppler Velocimetry (PDV) method that allows velocity measurements to be made, quickly and non intrusively, across a plane defined by a laser light sheet. In 2ν-PDV the flow is illuminated sequentially with two optical frequencies, separated by about 700MHz. A single CCD viewing through an iodine absorption cell i...

Laser Doppler Velocimetry