The muse_ampl recipe =============================================================== .. data:: muse_ampl Synopsis -------- Determine the instrumental throughput from exposures taken with the pico-amplifier / photo diode readings. Description ----------- This recipe combines several separate amplifier images (flat-fields with special FITS headers containing pico amplifier measurements) into one master image file and computes the instrumental throughput per IFU (and slice). Processing trims the raw data and records the overscan statistics, subtracts the bias (taking account of the overscan, if overscan is not "none"), and optionally, the dark from each raw input image, converts them from adu to count, scales them according to their exposure time, and combines them using input parameters. To compute the throughput the image is converted into a pixel table, the flux is then integrated over the given filter band, and the ratio of the expected flux (FITS header INS.AMPL2.CURR) to measured flux is taken, in the same units. If a geometry table was given as input, the relative area of the IFUs is taken into account when computing the flux per unit area. The resulting ratio is the instrument efficiency (throughput) and saved as QC parameters for the whole input image and per slice in the output pixel table. Constructor ----------- .. method:: cpl.Recipe("muse_ampl") :noindex: Create an object for the recipe muse_ampl. :: import cpl muse_ampl = cpl.Recipe("muse_ampl") Parameters ---------- .. py:attribute:: muse_ampl.param.nifu IFU to handle. If set to 0, all IFUs are processed serially. If set to -1, all IFUs are processed in parallel. (int; default: 0) [default=0]. .. py:attribute:: muse_ampl.param.overscan If this is "none", stop when detecting discrepant overscan levels (see ovscsigma), for "offset" it assumes that the mean overscan level represents the real offset in the bias levels of the exposures involved, and adjusts the data accordingly; for "vpoly", a polynomial is fit to the vertical overscan and subtracted from the whole quadrant. (str; default: 'vpoly') [default="vpoly"]. .. py:attribute:: muse_ampl.param.ovscreject This influences how values are rejected when computing overscan statistics. Either no rejection at all ("none"), rejection using the DCR algorithm ("dcr"), or rejection using an iterative constant fit ("fit"). (str; default: 'dcr') [default="dcr"]. .. py:attribute:: muse_ampl.param.ovscsigma If the deviation of mean overscan levels between a raw input image and the reference image is higher than |ovscsigma x stdev|, stop the processing. If overscan="vpoly", this is used as sigma rejection level for the iterative polynomial fit (the level comparison is then done afterwards with |100 x stdev| to guard against incompatible settings). Has no effect for overscan="offset". (float; default: 30.0) [default=30.0]. .. py:attribute:: muse_ampl.param.ovscignore The number of pixels of the overscan adjacent to the data section of the CCD that are ignored when computing statistics or fits. (int; default: 3) [default=3]. .. py:attribute:: muse_ampl.param.combine Type of combination to use (str; default: 'sigclip') [default="sigclip"]. .. py:attribute:: muse_ampl.param.nlow Number of minimum pixels to reject with minmax (int; default: 1) [default=1]. .. py:attribute:: muse_ampl.param.nhigh Number of maximum pixels to reject with minmax (int; default: 1) [default=1]. .. py:attribute:: muse_ampl.param.nkeep Number of pixels to keep with minmax (int; default: 1) [default=1]. .. py:attribute:: muse_ampl.param.lsigma Low sigma for pixel rejection with sigclip (float; default: 3.0) [default=3.0]. .. py:attribute:: muse_ampl.param.hsigma High sigma for pixel rejection with sigclip (float; default: 3.0) [default=3.0]. .. py:attribute:: muse_ampl.param.fbeam Factor to describe the widening of the beam from the focal plane to photo diode 2. (float; default: 1.1) [default=1.1]. .. py:attribute:: muse_ampl.param.temp Lamp temperature [K] used to create the black body function. (float; default: 3200.0) [default=3200.0]. .. py:attribute:: muse_ampl.param.savemaster Save the processed and combined master image before any concolution is done. (bool; default: False) [default=False]. .. py:attribute:: muse_ampl.param.savetable Save the table with all the processed pixel values. (bool; default: False) [default=False]. .. py:attribute:: muse_ampl.param.merge Merge output products from different IFUs into a common file. (bool; default: False) [default=False]. The following code snippet shows the default settings for the available parameters. :: import cpl muse_ampl = cpl.Recipe("muse_ampl") muse_ampl.param.nifu = 0 muse_ampl.param.overscan = "vpoly" muse_ampl.param.ovscreject = "dcr" muse_ampl.param.ovscsigma = 30.0 muse_ampl.param.ovscignore = 3 muse_ampl.param.combine = "sigclip" muse_ampl.param.nlow = 1 muse_ampl.param.nhigh = 1 muse_ampl.param.nkeep = 1 muse_ampl.param.lsigma = 3.0 muse_ampl.param.hsigma = 3.0 muse_ampl.param.fbeam = 1.1 muse_ampl.param.temp = 3200.0 muse_ampl.param.savemaster = False muse_ampl.param.savetable = False muse_ampl.param.merge = False You may also set or overwrite some or all parameters by the recipe parameter `param`, as shown in the following example: :: import cpl muse_ampl = cpl.Recipe("muse_ampl") [...] res = muse_ampl( ..., param = {"nifu":0, "overscan":"vpoly"}) .. seealso:: `cpl.Recipe `_ for more information about the recipe object. Bug reports ----------- Please report any problems to `Peter Weilbacher `_. Alternatively, you may send a report to the `ESO User Support Department `_. Copyright --------- This file is part of the MUSE Instrument Pipeline Copyright (C) 2005, 2019 European Southern Observatory This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02111-1307 USA .. codeauthor:: Peter Weilbacher