ao:throughput
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ao:throughput [2018/07/08 10:53] jones |
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| **__2011-11-09 Email from Judit: | **__2011-11-09 Email from Judit: | ||
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| Comment from Theo: This still seems very low, but I can't fault the math. How does this compare with the estimates contained in the proposal itself? Steve, can you remind us of where the original estimates came from? Clearly, we will need all of the visible light for this.\\ | Comment from Theo: This still seems very low, but I can't fault the math. How does this compare with the estimates contained in the proposal itself? Steve, can you remind us of where the original estimates came from? Clearly, we will need all of the visible light for this.\\ | ||
| **__2011-11-11 Email from Steve: | **__2011-11-11 Email from Steve: | ||
| I see from TR91 that the visible reflectance for old aluminum was extrapolated from much to the red, and also the comment that cleaning techniques can bring old aluminum reflectivity to near the new value. After some hunting, I found something more direct on this. I'm attaching a spreadsheet made at Kitt Peak when monitoring telescope primaries. I see that the reflectivity does seem to stabilize at considerably better than the " | I see from TR91 that the visible reflectance for old aluminum was extrapolated from much to the red, and also the comment that cleaning techniques can bring old aluminum reflectivity to near the new value. After some hunting, I found something more direct on this. I'm attaching a spreadsheet made at Kitt Peak when monitoring telescope primaries. I see that the reflectivity does seem to stabilize at considerably better than the " | ||
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| - | [[http:// | + | {{ao:Sample_of_Kitt_Peak_Primary_Mirror_Reflectivities.xls|Sample of Kitt Peak Primary Mirror Reflectivities.xls}}\\ |
| **__2011-11-11 Email from John: | **__2011-11-11 Email from John: | ||
| I agree. I measured reflectivity of ridiculously old and dirty aluminum coatings at iota with better values than that. I will have to dig out my iota memo...\\ | I agree. I measured reflectivity of ridiculously old and dirty aluminum coatings at iota with better values than that. I will have to dig out my iota memo...\\ | ||
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| In the end I think, the new thick line on the graph can be taken as upper limit for detected photons.\\ | In the end I think, the new thick line on the graph can be taken as upper limit for detected photons.\\ | ||
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| __**Judit 2011-11-23: | __**Judit 2011-11-23: | ||
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| One to show the difference between the QE of the currently used tip/tilt CCD and two of the curves from Xiao's presentation.\\ | One to show the difference between the QE of the currently used tip/tilt CCD and two of the curves from Xiao's presentation.\\ | ||
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| - | The other plot is showing how the number of photoelectrons, | + | The other plot is showing how the number of photoelectrons, |
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| Note that the slightly better QE curve does not make much difference compared to the QE of our current CCD. The significant difference from\\ | Note that the slightly better QE curve does not make much difference compared to the QE of our current CCD. The significant difference from\\ | ||
ao/throughput.1531061615.txt.gz ยท Last modified: 2018/07/08 10:53 by jones
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