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Small Angle Light Scattering


Small angle light scattering (SALS) enables the user to determine an “average” spherulite diameter within a semicrystalline polymer.  A Melles Griot HeNe Class IIIb laser is fired into a thin sample of polymer.  The scattered light travels through a polarizer (usually) oriented at 90° to the polarization direction of the original laser light in order to form an Hv scattering pattern.  The scattering pattern is then focused, via a series of lenses, into a CCD camera.  Direct translation of the image to digital form helps to make measurements as accurate as possible.  Additionally, the Mettler hot stage gives the user the option of conducting tests at higher temperatures, or even over a range of temperatures at a specified rate.  The entire unit is enclosed within a dark box in order to avoid recording any reflections from ambient light.