With using refractometer kpr 300 we can know the relation between refractive index and wavelength δn δλ by multi wavelength measurement.
Acrylic sheet refractive index.
Physical properties astm test method units values specific gravity d 792 1 19 optical refractive index d 542 1 49 light transmittance total haze d 1003 92 2 sound transmission e 90 e 413 db 27 water absorption d 570 by wt 0 4 shrinkage d 702.
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Kpr 300 can also measure resin samples that cannot be processed and be measured.
There are also weaker dependencies on temperature pressure stress etc as well on precise material compositions presence of dopants etc.
Pmma acrylic polymer has a refractive index of 1 49 and a density ranges between 1 17 1 20 g cm 3 which is half less than that of glass.
For edge lighting applications.
Below are files of complete refractive index and extinction coefficients.
Many 3d applications these days allow you to input actual ior values in order to achieve a more accurate representation of surfaces during rendering of your 3d models.
Refractive index database the table below contains links to refractive index data for common materials.
Poly methyl methacrylate pmma also known as acrylic acrylic glass or plexiglass as well as by the trade names crylux plexiglas acrylite astariglas lucite perclax and perspex among several others see below is a transparent thermoplastic often used in sheet form as a lightweight or shatter resistant alternative to glass the same material can be used as a casting resin or in inks.
Pmma grades allow 92 of light to pass through it which is more than glass or other plastics.
Over the past few years i have been collecting ior index of refraction values i can find for use in 3d rendering applications.
Transmittance pmma acrylic polymer has a refractive index of 1 49 and hence offers high light transmittance.
When refractive index surface reflectance and absorbance of the sheet are known the designer can create displays that appear to be self illuminated.
These plastic materials can easily be thermoformed without any loss in optical clarity.
Standard refractive index measurements are taken at the yellow doublet sodium d line with a wavelength of 589 nanometers.
This page shows the results of measuring the refractive index with three wavelengths d line c line f line of acrylic resin pmma molded aspheric lens.
To make the most effective and efficient use of edge lighted acrylic shapes fabricators must consider the following basic design factors.
Many materials have a well characterized refractive index but these indexes depend strongly upon the frequency of light.
For a typical sample of acrylic the refractive index and extinction coefficient at 632 8 nm are 1 48899 and 0.
Index of refraction values ior for use with 3d modeling rendering and animation applications.
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