RI measurement of glass fibres
RI measurement of glass fibres
(OP)
Does anybody know how to measure the refractive index of a glass fibre (e-glass/s-glass etc)? I can get the range of liquids I need but I can't find any information on the technique itself.
Grateful for any help/direction
Grateful for any help/direction





RE: RI measurement of glass fibres
Index of refraction (n)=Speed of light in vacuum/ speeed of light in medium.
Their optics and optical instruments catalog shows the values of the refractive index for various types of glass, e.g.fused silica,borofloat,prex 7740, zerodur etc. Typical values for this type of glass is shown to be respectively 1.458, 1.472,1.474 etc.
They also sell refractrometers, that measure the reractive index of liquids and solids in the range from 1.4 to about 1.7, and sell for more than $ 1000 U.S. Check them out at www.edsci.com
Good luck with your reaseach.
RE: RI measurement of glass fibres
http://www.chem.orst.edu/ch361-464/ch362/refract02.htm
http://www.c-f-c.com/supportdocs/refract.htm
As you can see, since it's absurdly difficult to measure the change in the speed of light, we take advantage of Snell's law to directly measure the change in angle of a beam of light crossing the interface, which is a direct consequence of the index change.
TTFN