Particle Size Measurement

Shine an expended He-Ne laser beam through a plate dusted with lycopodium powder to construct circular rings on the screen which are nearly spherical and have a very uniform average diameter. The quality of the ring depends on the evenness of lycopodium powder.

Features:

• Supplied with 3 in 1 grading (100,300,600 lines per mm)
• He-Ne laser with in-built power supply.
• Translucent screen to view the diffraction pattern.
• Saddle can hold rod from 8 to 15mm.
• Heavy, rigid and stable Triangular Optical bench (made of Al extrusion).
• Height and level adjustment screws (made of SS)

Objectives:

• Determination the wavelength of He-Ne laser using diffraction grating.
• Determination the particle size of lycopodium powder.

Technical Data:

• Optical bench : Al exclusion, L = 1m, Triangular shape with end stop, 4 point levelling (SS screw)
• Fixed slider : Al Extrusion, Base W x H,50mm x 115mm
• Screen : Acrylic(translucent) 300 x 300 x 3mm
• Laser : He-Ne Laser (632mm), Power 2 mW, Beam spot 2.5mm, current 4mA ~ 6mA, Dimension 300 x 62 x 82mm
• Diffraction Grating : Size 89 X 38 mm, Aperture 16 X 9 mm Rulings 100,300,600 lines/mm
• Lycopodium Powder: 50 gm
• Slit Holder : Aperture 45x45mm, Clip type holder Mounting rod 10mm

Scope of Delivery:

• 1 He-Ne laser
• 1 Optical Bench triangular
• 1 Object screen
• 2 Glass plate (40 x 40mm)
• 1 Diffraction grating (imported)
• 1 Slit holder
• 1 Slit (Blade)
• 1 Measuring tape (3 m)
• 1 Lycopodium powder
• 2 Fixed slider
• 1 Fixed slider large width

Key Topics:

• Diffraction.
• Fresnel diffraction.
• Fraunhofer diffraction
• Uncertainty of location.
• Wave-particale.