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Digital Particle Streak Velocimetry

Digital Particle Streak Velocimetry (DPSV) flow visualisation technology.

DPSV is a non-intrusive flow visualisation technique that uses a laser to provide real-time vectorised, single or averaged, 2D or 3D imaging of the flow of gas or liquid near the critical parts of moving or stationary objects. The technology works on flow velocity ranges of 0 to supersonic.

It has applications in industries such as aerospace, automotive engineering, and biomedical research and medical diagnosis, and ship/submarine design.

The aim of flow visualisation in fluid dynamics is to make the flow patterns visible in order to obtain qualitative (e.g. about concentration) or quantitative (e.g. about velocity) data. Many common fluids and gases (like water and air) are transparent, thus their flow patterns are invisible unless something is added to make them visible. Different kinds of microscopic particles can be added to a flow to trace the fluid motion. These the particulates can then be illuminated with a sheet of laser light to visualise the flow pattern. Information about flow is extremely important to the designers of any object located in a moving flow (for example to aerospace engineers), as flow will determine the type and location stress an object will be under.

DPSV is non-intrusive, meaning that this method does not rely upon the insertion of material probes, using the light reflected from the seeding particles instead. The result is an undisturbed flow that accurately reflects the testing conditions, making it superior to currently existing technologies. The non-intrusive nature of DPSV and its low-level energy requirements mean it can be used for the vectorisation of the flow inside the blood vessels of living organisms, making it a powerful biomedical diagnostic tool (for instance, to identify and study cardiovascular diseases).

A unique benefit of DPSV is that it can supply researchers with instantaneous, real-time vectorised information about the flow of gas or liquid around an object currently in motion. For example, one or several DPSV units can be installed on an aeroplane or submarine to provide the engineers with instantaneous information about the lift and drag forces acting on the vehicle.

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