https://github.com/gully/orderoverlap
Calculate order overlap for given level of off-band rejection
https://github.com/gully/orderoverlap
Last synced: 5 months ago
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Calculate order overlap for given level of off-band rejection
- Host: GitHub
- URL: https://github.com/gully/orderoverlap
- Owner: gully
- Created: 2014-02-21T22:40:58.000Z (over 12 years ago)
- Default Branch: master
- Last Pushed: 2014-02-26T17:02:07.000Z (over 12 years ago)
- Last Synced: 2025-06-11T06:06:12.642Z (about 1 year ago)
- Language: IDL
- Size: 4.7 MB
- Stars: 0
- Watchers: 2
- Forks: 0
- Open Issues: 0
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Metadata Files:
- Readme: README.md
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README
This is an IDL script to calculate the background order overlap. The key parameter is the off-band rejection that the filter can provide. This script seeks to estimate the real specification.
User beware: There is tons of hardcode here. This is really just a framework.
The rough sketch of the code is:
1) Use the observed published Kitt Peak Observatory atmospheric spectrum. It assumes Earth albedo is 100% everywhere, always.
2) I simulated the grating properties taken from the ACT annual report: 15th order, grating pitch = 11.525 um.
3) I assumed 0.05% off-band rejection.
4) I calculated the approximate wavelength range of the order overlap from the grating equation (in an admittedly half-assed way).
5) I wildly guessed we would pick up orders 8-20.
6) I summed the synthetic background. For display purposes, I re-normalized the spectrum by (1+ the background mean).