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Sizing Systems
- for size measurements of drops / droplets, bubbles and solid
particles, including on-line and at-line particle sizing systems - VisiSizer PDIA
Sizing Software
- for image analysis of drop / droplet, bubble and particle size
and shape measurement - VisiSize Solo.
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Particle Droplet Image Analysis (PDIA)
Size and shape measurement of a wide range
of solid particles, liquid drops / droplets, gas bubbles etc can be performed
by PDIA. No other diagnostic tool is as intuitive to use as direct imaging equipment -
if you can operate a camcorder or digital camera, you can master a VisiSizer analyzer.
VisiSizer not only provides accurate particle size distributions but also records images of your subject (particle / drop /
droplet / bubble).
This gives VisiSizer the unique ability to
generate particle sizing, drop sizing, (such as spray nozzle droplets), spray
sizing, bubble sizing and velocity measurements and images of the particles /
drops / droplets / bubbles simultaneously.
The technique works by capturing images of
particles etc using high resolution cameras together with short pulse laser
illumination to freeze the motion. Software then measures the particle size and shape
and calculates the size distribution.
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Image-based sizing measures shape
On the left is the first ever in-flight
image of a droplet from an agricultural "air-inclusion"
nozzle. From this image, taken from a VisiSize system,
not only is the droplet non-spherical, but air bubbles
are visible within the water drop.
Other particle sizing techniques such as PDA or laser
diffraction would mis-size the droplet without indicating
they had done so - and you would never have known about
the air inclusions
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Applications
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How it works
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The image (right) shows the optical arrangement used
for particle / drop / bubble sizing (applied to a metered dose inhaler). A short
flash of light from a laser illuminates a screen, which
acts as a bright background behind the subject spray. The
short pulse from the laser freezes the motion of the droplet,
allowing blur-free visualisation of drop size and shape.
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Images from the digital camera are transferred to a computer
and high-speed real-time particle sizing software
analyses the images obtained in order to build up a drop size
distribution. By double-pulsing the laser in a technique similar
to PIV, particle size vs. velocity distributions
may also be measured. For more information about the technique
see our in-flight sizing datasheet.
Product selection matrix
The table below gives an idea of the system configurations available.
More details are given in the particle
sizing product datasheet. Other configurations are available
- for more information contact us.
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System
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Max. Speed (frames/sec)
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Comments
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VisiSizer SP
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30
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Use for continuous or repetitive subjects where there is
no need to measure velocity
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VisiSizer DP
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30
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Use for continuous or repetitive subjects where velocity
info as well as size is required
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VisiSizer MP
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30
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Low cost solution for slow-moving continuous or repetitive
subjects. Gives velocity info.
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VisiSizer Pro
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10 000
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Use for transient events lasting about 10 ms or longer
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VisiSizer Max
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50 000
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Very fast. Use to capture short events with fast moving
objects
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proSizer
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30
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VisiSizer DP in explosion-proof package for process control in hazardous environments
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For more information
Download Product Datasheet for:
Download Application Brief on:
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