RANGE IN MICRONS
10nm - 5,000 (5mm)
OPTIMAL APPLICATIONS
POWDERS, SUSPENSIONS,
AND EMULSIONS
WEIGHT 56kG (123 lbs)
FOOTPRINT
WIDTH 705mm (28”)
DEPTH 565mm (22”)
HEIGHT 500mm (20”)
The LA-960 combines the most popular modern sizing technique with state of the
art refinements to measure wet and dry samples measuring 10 nanometers to 5
millimeters. The central idea in laser diffraction is that a particle will scatter light at an
angle determined by that particle’s size. Larger particles will scatter at small angles and
smaller particles scatter at wide angles. A collection of particles will produce a pattern
of scattered light defined by intensity and angle that can be transformed into a particle
size distribution result.
INTRODUCTION
The knowledge that particles scatter light is not new. Rayleigh scattering of light from
particles in the atmosphere is what gives the sky a blue color and makes sunsets
yellow, orange, and red. Light interacts with particles in any of four ways: diffraction,
reflection, absorption, and refraction. Figure 17 shows the idealized edge diffraction
of an incident plane wave on a spherical particle. Scientists discovered more than a
century ago that light scattered differently off of differently sized objects. Only the
relatively recent past, however, has seen the science of particle size analysis embrace
light scattering as not only a viable technique, but the backbone of modern sizing.
Bench-top laser diffraction instruments
became practical with the advent of high
intensity, reasonably priced lasers and
sufficient computing power to process
the scattered light data. Once these
barriers to market entry were eliminated
the advantages of laser diffraction over
other techniques were apparent: speed
of analysis, application flexibility, small
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