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The development of a planar Doppler velocimetry is described. The technique is capable of measuring the three,instantaneous components of velocity in two dimensions using a single pair of signal and reference cameras. PDV canbe used to measure the instantaneous 3-D velocity of a fluid by using an absorption line filter (ALF) to determine theDoppler shifted frequency of a narrow line pulsed laser (Nd:YAG) that has been scattered off particles seeded into theflow. The velocity of the fluid is determined using the Doppler formula and is dependent on the laser direction and theviewing direction. Hence, only one velocity component of the flow is measured. This component can be measured intwo spatial dimensions using an array detector such as a CCD camera. To capture the three components, three suchmeasurement heads have been used viewing from different angles. In the technique presented here the three views areported from the collection optics to a single imaging plane using flexible fibre imaging bundles. These are made up of acoherent array of single fibres and are combined at one end as the input plane to the measurement head. The paperdiscusses the issues involved in developing a full three-dimensional velocity measurement system

Planar Doppler velocimetry measurements of flows using imaging fiber bundles