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Good CCD Camera for 10k-15k Euro
Dear David,
On Tue, 02 Mar 2004 20:11:34 +0000, David Whysong wrote: That's not read noise, it must be the bias level. You can subtract it off relatively cleanly. Hmm, from the user's point of view one cannot determine if it is really bias, i.e. due to too low pre biasing the pixel cells in order to remove noise or if it is real read out noise. Please correct if I'm wrong. Anyway, the performance is ok but the "bias/readout" noise. If you're working on driving the newer SBIG cameras from Linux, I'd love to hear about it. I'm thinking about doing that myself. No problem, David. Watch the following link: http://almasw.hq.eso.org/almasw/bin/view/Main/WebHome - ALMASW.ACS - ACS For (non-)ALMA projects: ACS contributed code After next week I'll upload the final source code release for our telescope project. The software is integrated into the ACS (ALMA Common Software, a kind of abstraction and expansion of ACE & TAO) but it should be an easy job for a programer to grab the main things from it. I'm using the latest SBIG developer libraries, so that the (hopefully soon arriving) STL should run flawlessly. But... I have not integrated the filterwheel yet. This is scheduled for 3rd quarter this year. Best regards, Thomas |
#12
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Good CCD Camera for 10k-15k Euro
Thomas Juerges wrote:
Dear David, On Tue, 02 Mar 2004 20:11:34 +0000, David Whysong wrote: That's not read noise, it must be the bias level. You can subtract it off relatively cleanly. Hmm, from the user's point of view one cannot determine if it is really bias, i.e. due to too low pre biasing the pixel cells in order to remove noise or if it is real read out noise. Please correct if I'm wrong. Anyway, the performance is ok but the "bias/readout" noise. Ok, maybe I'm confused... If you take two short ( 1 second) exposures, then subtract one from the other, what is the RMS of the resulting image? It should be something of order 10; if it's more like 4000, then something is very wrong with your camera. After next week I'll upload the final source code release for our telescope project. The software is integrated into the ACS (ALMA Common Software, a kind of abstraction and expansion of ACE & TAO) but it should be an easy job for a programer to grab the main things from it. I'm using the latest SBIG developer libraries, so that the (hopefully soon arriving) STL should run flawlessly. But... I have not integrated the filterwheel yet. This is scheduled for 3rd quarter this year. Thanks for the link! I had a look at the SBIG library, the STL cameras have a very high level filter wheel interface so programming that should be easy compared to (for example) autoguiding. Anyway I'll definitely have a look at your software when it's posted, thanks. Dave David Whysong DWhysong (at) physics (dot) ucsb (dot) edu |
#13
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Good CCD Camera for 10k-15k Euro
Dear David,
On Wed, 03 Mar 2004 22:28:31 +0000, David Whysong wrote: Ok, maybe I'm confused... If you take two short ( 1 second) exposures, then subtract one from the other, what is the RMS of the resulting image? It should be something of order 10; if it's more like 4000, then something is very wrong with your camera. See the personal mail I sent you for my current time schedule. I'll keep the mailing list informed. Thanks for the link! I had a look at the SBIG library, the STL cameras have a very high level filter wheel interface so programming that should be easy compared to (for example) autoguiding. Anyway I'll definitely have a look at your software when it's posted, thanks. Yes, you are right. There is only a small but: They have implemented not as much as they should have done. Some features are still missing as a function to be called for repetitive exposures or reading out the ambient temperature sensor as it is possible for ccd temperature. Although it is not a big problem to put the needed functionality into the library code. Regards, Thomas |
#14
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Good CCD Camera for 10k-15k Euro
Thomas Juerges wrote:
Yes, you are right. There is only a small but: They have implemented not as much as they should have done. Some features are still missing as a function to be called for repetitive exposures or reading out the ambient temperature sensor as it is possible for ccd temperature. Although it is not a big problem to put the needed functionality into the library code. That's too bad. I must say that I'm a little annoyed that the driver source code isn't available. They have a binary-only module, which limits the architecture and kernel compatability of their cameras. Since my development computer is a dual Opteron, I can't load the driver. Starlight Xpress cameras are extremely well supported under Linux; I tested the HX916 support and wrote my own camera control software in Perl/PDL. I'd like to be able to do the same sort of thing with SBIG cameras. Dave David Whysong DWhysong (at) physics (dot) ucsb (dot) edu |
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