[Prev][Next][Index][Thread]
Re: (meteorobs) Transmission Gratings
In message <9701100909.AA03134@kyle.au.sac.acdot uk>, Nick Martin
<N.Martin@au.sac.acdot uk> writes
>Has anyone ever tried to make a fluid prism? With the aid of silicone
>cement it would be possible to assemble a hollow prism of a good
>quality float or plate glass. Theoretically this could be filled with
>a suitable dispersive solution whether sugar, glycerol, salts of
>suitable metals or other aqueous solutions or oils such as microscope
>immersion oil. Prisms would have the advantage over gratings that all
>the light goes into one spectrum but the disadvatage of unequal
>dispersion through the spectrum.
>The optical quality of the glass would be adequate for camera work.
>One problem would be to ensure temperature equilibration before use
>to avoid the effects of convection currents and consequent optical
>inhomogeneity. With strong solutions or pure materials freezing would
>not be a problem under most conditions.
I'm trying to keep clear of using Prism's, it would be easy and quite
inexpensive to make a large glass Prism. However the non linear
dispersion makes reduction more difficult, but also harder to use due to
the angles of refraction involved.
--
Jeff Lashley
References: