Laser Diffraction Particle Analyzer
The Malvern Analyzer, manufactured by Malvern Instruments Ltd., United
Kingdom, is a spatial sampling device that utilizes the
principle of light scattering to measure drop size.
A drop causes laser light to scatter through an angle dependent on the
diameter of the drop. The scattered light intensity is measured using
a series of semicircular photo diodes. Theoretically, the distance of
the individual photo diodes from the centerline of the laser and the light
intensity functions are all that are needed to calculate the drop size
distribution.
A curve-fitting program is used to convert the light intensity distribution
into any of several empirical drop size distribution functions. The instrument
includes self-diagnostics to facilitate identification of potential error
sources. These instruments are aligned and calibrated periodically using
the calibration verification procedure performed in accordance with ASTM
Standard E1458-92.
The Malvern Analyzer is best suited for measuring small capacity two-fluid,
hydraulic and flat spray nozzles and is useful for comparisons and quick
evaluations of prototype nozzles.
Measurement range: 5 – 1800 μm.

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