Integrated Solutions in Particle Dynamics Analysis
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Integrated solutions in Particle Dynamics Analysis

Integrated PDA solutions Dantec Dynamics’ Particle Dynamics Analysis (PDA) systems measure on-line the size, velocity and concentration of spherical particles, droplets or bubbles suspended in gaseous or liquid flows. PDA applications The most popular application is the analysis of atomised liquids (sprays). Sprays are used in countless applications, both in industrial processes and commercial products. The spray nozzle has a decisive influence on the distribution and droplet size of the atomised liquid in applications such as: ● Fuel injection ● Spray painting ● Liquid metal sprays ●...

Measurement volume Signal processing The principles of Particle Dynamics Analysis (PDA) A) The measurements are performed at the intersection of two laser beams, where there is an interference fringe pattern of alternating light and dark planes. B Particles scatter the light, which appears to flash, as the particles pass through the bright planes of the interference pattern. Receiving optics placed at an off-axis location focus scattered light onto multiple detectors. Each detector converts the optical signal into a Doppler burst with a frequency linearly proportional to the particle...

Particle Dynamics Analysers can be used for a wide range of applications, where detailed information on the size and velocity of individual droplets, bubbles or spherical solid particles is needed. These applications are related to research activities at universities or research centres as well as for industrial process optimisation. Liquid metal spray Spray-forming processes involve the atomisation of a molten metal stream by means of a high-speed gas jet. The resulting droplets are then convected by the gas stream towards the substrate on which the partly solidified droplets build up a...

Cavitation measurement near the blades of a propeller. Automobile spray painting. Photo courtesy of DaimlerChrysler. Engine fuel injector study using a Dantec Dynamics PDA system. Photo courtesy of AVL.

A Dantec Dynamics PDA system comprises transmitting and receiving optics, a processor and BSA Flow Software package. The optics are integrated and compact probes provide all the required features for easy alignment. A large selection of front lenses and beam expanders provides flexibility to adapt to your specific requirements. Transmitting optics FiberFlow The FiberFlow optical system offers a wide selection of probes and accessories. The modularity of the system gives the user considerable flexibility in configuring the transmitting optics. Both the number of measured velocity components...

FiberPDA The FiberPDA receiving probe is based on fibre technology with three receiving apertures. This configuration yields a large measurable size range while maintaining high resolution. A large selection of front lenses, beam expanders and spatial filters (112 mm probe) and easily exchangeable aperture masks provides the flexibility to adapt the system to measurement distance, size and velocity range. The FiberPDA receiving probe is connected to the detector unit through a fibre cable containing three receiving fibres. The detector unit contains three, four or five photomultipliers,...

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