Basic Exposure Time Calculator by J. Rhoads and R. Jansen, ASU
Output: x-axis: log(independent variable) in default units (i.e. the same units as input on the form).
y-axis: Log of exposure time (per individual exposure) required to reach the requested s/n ratio.
SFC ETC Revision History | |
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15 Jul 2008 [JER] | initial version of SFC ETC; hacked incredibly much from the MMTF Fabry Perot calculator by Weiner and Rupke; filter parameters taken from Jansen's FOV trade study [Jul 15] |
17 Jul 2008 [JER] | implemented plotting; first version with all bells and whistles. |
06 Aug 2008 [RAJ] | updated effective filter parameters after change in camera design with additional optical elements (folds) and more realistic dichroic curves; re-optimized filters (narrow-filters, except F656N and F658N are now all 1% wide; got rid of narrow narrow-band [OII] and H-beta, but added two medium-band Ly-alpha filters; changed output format a bit (formatted HTML output table) |
13 Aug 2008 [RAJ] | changed HTML format of main ETC page a bit; added back in the narrow narrow-band [OII] and H-beta filters – design change [three wheels] appears to accomodate up to either 16 or 18 science filters again in each channel; we may still have to get rid of 2 filters in the Red Channel – Beware |
14 Aug 2008 [RAJ] | implemented field reporting flux integrated over velocity broadened emission line (narrow-band filters); implemented check for Δv > FWHM. If so, the integral will be over the filter FWHM. |
13 Nov 2008 [JER] | for narrow bands, the reported "AB mag" is what would be measured in the image (i.e., it converts to "flux in filter / bandwidth") rather than the input number, which is the AB magnitude in the emission line (i.e. "flux density at peak of emission line"). Added columns for the "incident flux" (which corresponds to the line flux for narrowband, a chunk of continuum for the other filters), the redshift of Lyα at filter center, the corresponding luminosity distance, and the corresponding luminosity. |