Update the instrument descriptor embedded in raw_spct and
raw_mspct objects.
Usage
update_instr_desc(x, which.descriptor.args = list())Details
Recomputing of physical quantities from raw counts normally reuses the
embedded calibration data in raw_spct objects.
Function update_inst_desc() makes it possible to update the embedded
calibration before recomputing derived quantities.
Spectral objects, including those with raw counts data contain an
instrument descriptor when measured or imported using functions from
'ooacquire'. The descriptor can include calibration data as well
as details of the instrument used. If a calibration has been retroactively
modified after data acquisition, the descriptor can be refreshed in
existing raw_spct or raw_mspct objects. By default the
the version of the new descriptor is that in the loaded version of
'ooacquire', corresponding to the same instrument, data acquisition date
and entrance optics.
If for some reason, an instrument descriptor for the wrong spectrometer,
the wrong entrance optics or for a wrong data acquisition date, a non-matching
replacement can be used by passing suitable arguments through parameter
which.descriptor.arg. See which_descriptor() for the
details.
Note
The replacement of the instrument descriptor is not supported for spectral data not expressed as raw counts, because this would create an inconsistency between the computed data and its metadata. To achieve such a change data in physical units have to be recomputed from raw instrument counts after updating the object containing the raw detector counts.
Warning!
This function is intended only to repair objects that have corrupted information. Typical cases are acquisition using a computer with wrong date settings, unrecognized instrument serial number, or measurements done before the valid calibration was added to 'ooacquire'.
The special case when the only change to the calibration is adding newly
identified bad pixels in the sensor array, function
update_bad_pixs provides a "light weight" alternative.