SK172 Particle Size Measurement

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.