Chris,
Congratulations on this project. It is something I was always interested
in but never motivated enough to follow through. So it was good to hear of
your success! (I could not find the spectroscope images on your page though)
andy
Chris wrote:
I wanted to make a spectrograph of ionised gas. I decided to put a hand
spectroscope on to my DSL camera. I bought one hand spectrograph but is was
square and was useless with the spectrum of to one side. So a bought another
and found this plastic one was just a toy and was useless even after I took
the eye lens off to fit on the camera.
I eventually found one also for school use that was the same diameter as a
microscope tube, made of metal, and would therefore fit my microscope
attachment. Then I found the eye lens would not come off so it had to be
fitted in front of the camera lens. I tried this by holding the combination
of spectroscope and microscope attachment in front of my 50 mm lens and
found that I got an image.
I then was able to buy a T2 to 46 mm filter attachment and using my existing
46 mm to 58 mm filter adapter I fitted in front on the lens.
I mounted the camera on a tripod and pointed the apparatus at the ionised
gas in the glass tube and took a succession of emission spectrographs with
different exposures. The best one was 30 seconds.
I obtained a satisfactory spectrograph with the red hydrogen lines (split
into two by the physical process involved) and a succession of lines right
across the visual range.
The spectroscope that I used finally is labelled "diffraction grating
spectroscope TE313". I cannot recall the company I bought if from but I
found it as a result of a web search and bought it off the web by secure on
line order.
You can find the spectrographs I took on my web page (below) - look under
H-power project > experiments.
The camera was a Cannon EOS 450D with cannon 50 mm prime lens f 1.4 used at
full aperture. The microscope attachment was a Fuji ST 701.
Chris
http://www.chrisspages.co.uk
