OCCHIO ZEPHYR LDA PARTICLE CHARACTERIZATION SYSTEM with COFFEE-TRAK
SMALL TO MEDIUM SAMPLES FOR DIFFICULT POWDERS AND LIGHT GRANULAR MATERIALS
EXAMPLES: FLOUR, GROUND COFFEE, RESIN, SUGAR
Occhio particle size and shape analyzers, are the collaboration of many years of focused research
in the fields of optics, lighting, and digital imaging.
Common methods of particle size analysis include laser diffraction, and sieve analysis, both of which are based
on the assumption that a sample is comprised of spherical particles.
While these methods of gathering size distribution information, provide usable results,
they lack in application, when compared with digital imaging technology.
Fig 1.1 A monochromatic, collimated back-light acts like a caliper.
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OCCHIO ZEPHYR LDA (LASER DIFFRACTION ALTERNATIVE)
SAMPLE TYPE: LESS DENSE POWDERS AND
GRANULARSTHAT DISPERSE BETTER IN FLIGHT
COHESIVE AND ELECTROSTATIC POWDERS
ZEPHYR LDA DRY 7 micron to 3 mm
WET 1 micron to 1 mm
BY USING A PARAMETER CALLED MAXIMUM INSCRIBED DISC, NEAR PERFECT SIEVE CORRELATION IS NOW POSSIBLE, SINCE THIS EFFECTIVELY MEASURES THE WIDEST PART OF A PARTICLE, WHICH CONSEQUENTLY DETERMINES THE SIEVE APERTURE SIZE THE PARTICLE WOULD OR WOULD NOT FALL THROUGH. BECAUSE WE CANNOT TELL WHETHER A PARTICLE FALLS THROUGH A SIEVE APERTURE SQUARELY OR ON ITS' DIAGONAL, THERE WILL BE SOME VARIANCE.
FOR BETTER CORRELATION TO A PARTICLES ACTUAL MASS, A PARAMETER CALLED EQUIVALENT DISC DIAMETER IS EMPLOYED. THIS BASICALLY EQUATES TO COUNTING PIXELS, AND CORRELATES MORE CLOSELY TO LASER DIFFRACTION RESULTS.
INSCRIBED CIRCLES ARE USEFUL IN DETERMINING OTHER IMPORTANT CHARACTERISTICS, SUCH AS ABRASIVE PROPERTIES OF PARTICLES
THIS ACTUAL IMAGE OF AN ESPRESSO COFFEE GRIND, HELPS SHOW
HOW SIEVING MAY PROVIDE FALSE INFORMATION IN REGARDS TO SIZE.
WHAT SIZE SQUARE APERTURE WOULD LIKELY CAPTURE THE PARTICLE.? EVEN MORE SO, WOULD IT FALL THROUGH ON THE PERPENDICULAR OR THE HORIZONTAL?
Also compared with direct measurements, laser diffraction results for plates and rods are difficult to correlate.
Using a special proprietary light source, and high resolution optics, select Occhio Particle Analyzers, are able to detect even sub visible particles as small as 200 nanometers, in real time. Kinetic analysis of particle aggregation in
OCCHIO DIGITAL IMAGE ANALYZERS HAVE THE ABILITY TO DETECT AND QUANTIFY BOTH PARTICLE SIZE AND PARTICLE SHAPE, PAVING THE WAY FOR THE ADVANCED ANALYSIS OF PARTICLES IN BOTH LIQUID AND SOLID FORMS.
CORRELATIONS TO OTHER PARTICLE SIZE ANALYSIS METHODS, LIKE SIEVE ANALYSIS AND LASER DIFFRACTION, ARE SEAMLESSLY EMPLOYED. EVEN SHAPE PARAMETERS LIKE LENGTH, FLATNESS, AND ANGULARITY IN AGGREGATES, OR THE LENGTH OF STRINGY PARTICLES LIKE SHREDDED CHEESE, OR TOBACCO, ARE POSSIBLE.
ONCE A BASIC CORRELATION HAS BEEN ESTABLISHED, THE RESULTS ARE FINE TUNED WITH THE OCCHIO CORRELATION PROGRAM, ALLOWING FOR TURNKEY SOLUTIONS TO PARTICLE CHARACTERIZATION.
