A UV-Visible-IR Spectrometer
The i-Phos HD spectrometeter, by Chris Wesley, is a ready-made version
of the Theremino spectrometer, with the option of a single 1mm slit, or
a set of interchangeable slits of 0.5, 1, 2, 3, 4 and 5 mm width. The
wavelength range is from about 360 nm (near UV) to 1150 nn (IR), with
some fall-off at the extremes. Resolution achievable with 1mm
slit is around 1 nm.
Here we adapt the i-Phos spectrometer by removing
the supplied 1 mm slit and attaching a Freseriksen
Symmetrically-Adjustable Slit assembly. This gives a continuous
adjustment range from 0.3 to 6 mm, with the exact setting easily
determined by measuring across the outside of the slit blades (using a
dial caliper) and subtracting a fixed amount.
Article under construction.
|Fusion 360 CAD rendering
of a 3D-printable mount, for attachment of a Frederiksen symmetric
adjustable slit assembly to the i-Phos spectrometer. Orange colour is
for visualisation only. Final print, in ABS, is black.
Design by Stephen D Knight.
i-Phos HD Spectrometer
building a standard definition version
Standard 640 × 480 manual-exposure webcam is no longer
available, so a dedicated 1920 × 1080 full HD camera module is now used.
a DIY Spectrometer
[Creative Lab] YouTube Video.
(please support this open-source facility).
Theremino Spectrometer Construction
Spectrometer, Sample Spectra
. Help file (instructions) is
in the zip file.
I finally obtained a Frederiksen adjustable slit from Timstar
(WF Education Group) but it took 4 months on back order before I got
it. Still, I suspect that Timstar deserves praise for getting it for me
at all, because when I went back to the Frederiksen Scientific site to
give a link to it, the item seemed to have disappeared from their
It is a beautiful piece of precision
Making something similar is not beyond the capability of a good
engineering workshop, but certainly not a trivial undertaking.
Ovio Instruments - Frederiksen slit