First Spectra from my new UVEX
Posted: Wed Sep 30, 2020 11:48 am
Hi All
I have built a UVEX spectrograph. I purchased a 600l/mm and 1200 l/mm grating but have only installed the 1200 so far.
I had to modify the design somewhat as I did not want to buy a new slit so am using a slit that was designed for my LISA. I had it spare as I had replaced it with a photometric slit.
The slit is larger than the one in the UVEX design so I had to create a mounting block that would still fit the UVEX box. I'm not clever enough to modify the 3D printing file so just made one out of aluminium using a mill. I also wanted a guiding module. I also made this out of aluminium based on the design from the inside of the 3D printed calibrex module. http://spectro-uvex.tech/?p=1365&lang=en
Because of the difference in the thickness of the slit it has been difficult to achieve correct focus with the camera. I did not have enough infocus so had to modify the slit mount to move it further in. I have mostly succeeded in aligning the mirrors but they are not perfect yet. I am using an ASI183MM as the camera. The spectra is very good in the middle 3/4 of the detector but the edges clearly softer.
The test spectra are of the near UV and Ha region.
Terry
I have built a UVEX spectrograph. I purchased a 600l/mm and 1200 l/mm grating but have only installed the 1200 so far.
I had to modify the design somewhat as I did not want to buy a new slit so am using a slit that was designed for my LISA. I had it spare as I had replaced it with a photometric slit.
The slit is larger than the one in the UVEX design so I had to create a mounting block that would still fit the UVEX box. I'm not clever enough to modify the 3D printing file so just made one out of aluminium using a mill. I also wanted a guiding module. I also made this out of aluminium based on the design from the inside of the 3D printed calibrex module. http://spectro-uvex.tech/?p=1365&lang=en
Because of the difference in the thickness of the slit it has been difficult to achieve correct focus with the camera. I did not have enough infocus so had to modify the slit mount to move it further in. I have mostly succeeded in aligning the mirrors but they are not perfect yet. I am using an ASI183MM as the camera. The spectra is very good in the middle 3/4 of the detector but the edges clearly softer.
The test spectra are of the near UV and Ha region.
Terry
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