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Apparatus for Determination

of Particle Size

Model: HO-ED-D-05

Holmarc's Apparatus for Determination of Particle size (Model No: HOED-D-05) is a simple equipment. When laser light passes through the particles, diffraction occurs and pattern is observed on a screen or wall at a distance. Kinematic adjustment of the laser head can be used to direct laser beam to the required spot on the glass slide with particle.

The device consists of a diode laser held on a kinematic mount and a glass slide fixed on the slide holder. The particles, of which diameters are to be determined are sprinkled on the glass slide.

Both the laser and slide holder are fixed on rail carriers which are held on a graduated solid aluminum rail. Particle size influences many properties of particulate materials and is a valuable indicator of quality and performance. The size and shape of powders influences it’s diffraction characteristics. The diffraction pattern of larger particles will have less distance between the first dark ring and the central maximum than that of smaller ones. There are several industrial and research applications where measurement of particle size is important.

The laser diffraction technique is based on the fact that the spatial distribution of scattered light is a function of the particle size of the sample



Experiment Examples

    To determine particle size of lycopodium using laser beam diffraction

The diffraction equation is,


D  =  1.22 l  λ  /  Sin  θ


Where D is the size of the particle, l is the distance between the particle and the screen, λ is the wavelength of light used and θ is the angle of diffraction.




Classification of Powders by Fineness

Classification of Powders Particle Size   (μm)
Very Coarse > 1000
Coarse 355 - 1000
Moderately Fine 180 - 355
Fine 125 - 180
Very Fine 90 - 125
Features

    Easy to perform

    Relatively simple and compact design

    Each particle can be individually examined

    Highly versatile


Related Topics

    Diffraction

    A ngle of diffraction

Scope of Supply


    Optical Rail

Model No: ED-D-05-OR
Length
:
300 mm
Material
:
Black anodized Aluminum alloy
Quantity
:
1 no.
Optical Rail

    Kinematic Laser Mount

Model No: ED-D-05-KLM
Material
:
Black anodized Aluminum alloy
Adjustments
:
Using 80 tpi lead screws
Adjustment Range
:
+/-4 degrees
Quantity
:
1 no.
Kinematic Laser Mount

    Specimen Holder with Mount

Model No: ED-D-05-SHM
Cavity Thickness
:
3 mm
Material
:
Black anodized Aluminum alloy
Quantity
:
1 no.
Specimen Holder with Mount

    Glass Slide

Model No: ED-D-05-GS
Material
:
Float
Quantity
:
5 nos.
Glass Slide

    Diode Laser with Power supply (Red)

Model No: ED-D-05-DLPR
Wave length
:
650 nm
Optical power
:
3 mW
Quantity
:
1 no.
Diode Laser with Power supply (Red)

    Accessories

User Manual
Sample Powder

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