PhotodiodeCalib

class lsst.ip.isr.PhotodiodeCalib(timeSamples=None, currentSamples=None, **kwargs)

Bases: IsrCalib

Independent current measurements from photodiode for linearity calculations.

Parameters:

timeSampleslist or numpy.ndarray

List of samples the photodiode was measured at.

currentSampleslist or numpy.ndarray

List of current measurements at each time sample.

loglogging.Logger, optional

Log to write messages to. If None a default logger will be used.

**kwargs

Additional parameters. These will be passed to the parent constructor with the exception of:

"integrationMethod"

Name of the algorithm to use to integrate the current samples. Allowed values are DIRECT_SUM, TRIMMED_SUM, and CHARGE_SUM (str).

"currentScale"

Scale factor to apply to the current samples for the CHARGE_SUM integration method. A typical value would be -1, to flip the sign of the integrated charge.

Attributes Summary

metadata
requiredAttributes

Methods Summary

apply(target)	Method to apply the calibration to the target object.
calibInfoFromDict(dictionary)	Handle common keywords.
determineCalibClass(metadata, message)	Attempt to find calibration class in metadata.
fromDetector(detector)	Modify the calibration parameters to match the supplied detector.
fromDict(dictionary)	Construct a PhotodiodeCalib from a dictionary of properties.
fromTable(tableList)	Construct calibration from a list of tables.
getMetadata()	Retrieve metadata associated with this calibration.
integrate()	Integrate the current.
integrateChargeSum()	For this method, the values in .currentSamples are actually the integrated charge values as measured by the ammeter for each sampling interval.
integrateDirectSum()	Integrate points.
integrateTrimmedSum()	Integrate points with a baseline level subtracted.
readFits(filename, **kwargs)	Read calibration data from a FITS file.
readText(filename, **kwargs)	Read calibration representation from a yaml/ecsv file.
readTwoColumnPhotodiodeData(filename)	Construct a PhotodiodeCalib by reading the simple column format.
setMetadata(metadata)	Store a copy of the supplied metadata with this calibration.
toDict()	Return a dictionary containing the photodiode properties.
toTable()	Construct a list of tables containing the information in this calibration.
updateMetadata([camera, detector, ...])	Update metadata keywords with new values.
updateMetadataFromExposures(exposures)	Extract and unify metadata information.
validate([other])	Validate that this calibration is defined and can be used.
writeFits(filename)	Write calibration data to a FITS file.
writeText(filename[, format])	Write the calibration data to a text file.

Attributes Documentation

metadata

requiredAttributes

Methods Documentation

apply(target)

Method to apply the calibration to the target object.

Parameters:

targetobject

Thing to validate against.

Returns:

validbool

Returns true if the calibration was applied correctly.

Raises:

NotImplementedError

Raised if not implemented.

calibInfoFromDict(dictionary)

Handle common keywords.

This isn’t an ideal solution, but until all calibrations expect to find everything in the metadata, they still need to search through dictionaries.

Parameters:

dictionarydict or lsst.daf.base.PropertyList

Source for the common keywords.

Raises:

RuntimeError

Raised if the dictionary does not match the expected OBSTYPE.

classmethod determineCalibClass(metadata, message)

Attempt to find calibration class in metadata.

Parameters:

metadatadict or lsst.daf.base.PropertyList

Metadata possibly containing a calibration class entry.

messagestr

Message to include in any errors.

Returns:

calibClassobject

The class to use to read the file contents. Should be an lsst.ip.isr.IsrCalib subclass.

Raises:

ValueError

Raised if the resulting calibClass is the base lsst.ip.isr.IsrClass (which does not implement the content methods).

fromDetector(detector)

Modify the calibration parameters to match the supplied detector.

Parameters:

detectorlsst.afw.cameraGeom.Detector

Detector to use to set parameters from.

Raises:

NotImplementedError

Raised if not implemented by a subclass. This needs to be implemented by subclasses for each calibration type.

classmethod fromDict(dictionary)

Construct a PhotodiodeCalib from a dictionary of properties.

Parameters:

dictionarydict

Dictionary of properties.

Returns:

caliblsst.ip.isr.PhotodiodeCalib

Constructed photodiode data.

Raises:

RuntimeError

Raised if the supplied dictionary is for a different calibration type.

classmethod fromTable(tableList)

Construct calibration from a list of tables.

This method uses the fromDict method to create the calibration after constructing an appropriate dictionary from the input tables.

Parameters:

tableListlist [astropy.table.Table]

List of tables to use to construct the crosstalk calibration.

Returns:

caliblsst.ip.isr.PhotodiodeCalib

The calibration defined in the tables.

getMetadata()

Retrieve metadata associated with this calibration.

Returns:

metalsst.daf.base.PropertyList

Metadata. The returned PropertyList can be modified by the caller and the changes will be written to external files.

integrate()

Integrate the current.

Raises:

RuntimeError

Raised if the integration method is not known.

integrateChargeSum()

For this method, the values in .currentSamples are actually the integrated charge values as measured by the ammeter for each sampling interval. We need to do a baseline subtraction, based on the charge values when the LED is off, then sum up the corrected signals.

Returns:

sumfloat

Total charge measured.

integrateDirectSum()

Integrate points.

This uses numpy’s trapezoidal integrator.

Returns:

sumfloat

Total charge measured.

integrateTrimmedSum()

Integrate points with a baseline level subtracted.

This uses numpy’s trapezoidal integrator.

Returns:

sumfloat

Total charge measured.

See also

lsst.eotask.gen3.eoPtc

classmethod readFits(filename, **kwargs)

Read calibration data from a FITS file.

Parameters:

filenamestr

Filename to read data from.

kwargsdict or collections.abc.Mapping`, optional

Set of key=value pairs to pass to the fromTable method.

Returns:

caliblsst.ip.isr.IsrCalib

Calibration contained within the file.

classmethod readText(filename, **kwargs)

Read calibration representation from a yaml/ecsv file.

Parameters:

filenamestr

Name of the file containing the calibration definition.

kwargsdict or collections.abc.Mapping`, optional

Set of key=value pairs to pass to the fromDict or fromTable methods.

Returns:

calibIsrCalibType

Calibration class.

Raises:

RuntimeError

Raised if the filename does not end in “.ecsv” or “.yaml”.

classmethod readTwoColumnPhotodiodeData(filename)

Construct a PhotodiodeCalib by reading the simple column format.

Parameters:

filenamestr

File to read samples from.

Returns:

caliblsst.ip.isr.PhotodiodeCalib

The calibration defined in the file.

setMetadata(metadata)

Store a copy of the supplied metadata with this calibration.

Parameters:

metadatalsst.daf.base.PropertyList

Metadata to associate with the calibration. Will be copied and overwrite existing metadata.

toDict()

Return a dictionary containing the photodiode properties.

The dictionary should be able to be round-tripped through. fromDict.

Returns:

dictionarydict

Dictionary of properties.

toTable()

Construct a list of tables containing the information in this calibration.

The list of tables should create an identical calibration after being passed to this class’s fromTable method.

Returns:

tableListlist [astropy.table.Table]

List of tables containing the photodiode calibration information.

updateMetadata(camera=None, detector=None, filterName=None, setCalibId=False, setCalibInfo=False, setDate=False, **kwargs)

Update metadata keywords with new values.

Parameters:

cameralsst.afw.cameraGeom.Camera, optional

Reference camera to use to set _instrument field.

detectorlsst.afw.cameraGeom.Detector, optional

Reference detector to use to set _detector* fields.

filterNamestr, optional

Filter name to assign to this calibration.

setCalibIdbool, optional

Construct the _calibId field from other fields.

setCalibInfobool, optional

Set calibration parameters from metadata.

setDatebool, optional

Ensure the metadata CALIBDATE fields are set to the current datetime.

kwargsdict or collections.abc.Mapping, optional

Set of key=value pairs to assign to the metadata.

updateMetadataFromExposures(exposures)

Extract and unify metadata information.

Parameters:

exposureslist

Exposures or other calibrations to scan.

validate(other=None)

Validate that this calibration is defined and can be used.

Parameters:

otherobject, optional

Thing to validate against.

Returns:

validbool

Returns true if the calibration is valid and appropriate.

writeFits(filename)

Write calibration data to a FITS file.

Parameters:

filenamestr

Filename to write data to.

Returns:

usedstr

The name of the file used to write the data.

writeText(filename, format='auto')

Write the calibration data to a text file.

Parameters:

filenamestr

Name of the file to write.

formatstr

Format to write the file as. Supported values are:

"auto" : Determine filetype from filename. "yaml" : Write as yaml. "ecsv" : Write as ecsv.

Returns:

usedstr

The name of the file used to write the data. This may differ from the input if the format is explicitly chosen.

Raises:

RuntimeError

Raised if filename does not end in a known extension, or if all information cannot be written.

Notes

The file is written to YAML/ECSV format and will include any associated metadata.