Color Analyzer
How do you measure birefringence of thin rock sections?
Im getting a bit confused about how to measure the birefringence of minerals when using a microscope in my geology class. Obviously the analyser is in so that its not in plain polarised light. Then were given a birefringence chart and asked to determine the birefringence of a certain mineral in the slide. When the stage is turned, the colours change through extinction (black) to whatever colour. So, when you need to determine the birefringence colour (and find out what order its in), is this the maximum birefringence ? If so how do you measure this ? Im thinking that to measure this, you turn the stage a certain amount from the extinction, and then that colour is the maximum birefringence and the one that’s use-full. The problem im having is that i don’t know what im looking for, it all just looks like a load of changing colours, can anyone help.
If you have an analyser in the light path you are dealing with polarised light. The analyser is simply a second polarising filter.
Birefingance occurs in crystals which are not isotropic in all axes. They split the light into two beams with polarising angles at 90 degrees to each other.
One axis of the crystal is normally isotropic so no polarisation takes place.
Find that axis, set the stage angle scale to zero and then turn the stage until maximum birefringance occurs and note the angle.
The most intense colours are first order, next most intense are second order, etc. just the same as when you sometimes see a faint rainbow outside the main one.
. There is a good diagram of it on the first link, scroll down.
Here is a tutorial on birefringance and how to measure it and a similar one below.
The Java applets take a while to load.
http://www.olympusmicro.com/primer/lightandcolor/birefringence.html . . . . .
http://www.microscopyu.com/tutorials/java/polarized/crystal/ . . . .
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