Difference: HipeWhatsNew8x (39 vs. 40)

Revision 402011-11-03 - DavidSharpe

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META TOPICPARENT name="HipeWhatsNew"

What's coming up in HIPE 8

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Calibration Products

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The Spectrometer Beam Parameters calibration product used by the Point Source Flux Conversion now contains the wavenumber-dependent point-source flux conversion factors for each spectrometer detector. Previously, this product contained factors only for each spectrometer array.
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  • The Spectrometer Beam Parameters calibration product used by the Point Source Flux Conversion now contains the wavenumber-dependent point-source flux conversion factors for each spectrometer detector. Previously, this product contained factors only for each spectrometer array.
 
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The Spectrometer Nominal PCAL calibration product contains the weighted mean and standard deviation PCAL level separation for dark sky in Nominal Mode. This calibration product is used by the new PCAL Gain module.
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  • The Spectrometer Nominal PCAL calibration product contains the weighted mean and standard deviation PCAL level separation for dark sky in Nominal Mode. This calibration product is used by the new PCAL Gain module.
 
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The Spectrometer Bright Mode Gain calibration product contains the intercept and gradient for the wavenumber-dependent gain. This calibration product is used by the new Bright Mode Gain module.
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  • The Spectrometer Bright Mode Gain calibration product contains the intercept and gradient for the wavenumber-dependent gain. This calibration product is used by the new Bright Mode Gain module.
 

Calibration Framework

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Spectrum Flux Calibration

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The Flux Calibration module has been replaced by two modules, the Point Source Flux Calibration module and the Extended Source Flux Calibration module. References to SpecFluxConversionTask should be replaced with SpecPointFluxConversionTask or SpecExtendedFluxConversionTask. Read more in the pipeline specification manual at Spectrum Point Source Flux Calibration and Spectrum Extended Source Flux Calibration.
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  • The Flux Calibration module has been replaced by two modules, the Point Source Flux Calibration module and the Extended Source Flux Calibration module. References to SpecFluxConversionTask should be replaced with SpecPointFluxConversionTask or SpecExtendedFluxConversionTask. Read more in the pipeline specification manual at Spectrum Point Source Flux Calibration and Spectrum Extended Source Flux Calibration.
 
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The Point Source Flux Calibration module can now be applied to more than just the central detectors.
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  • The Point Source Flux Calibration module can now be applied to more than just the central detectors.
 

Spectral Unit and Unit-Flexibility

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It is now possible to specify the spectral unit of the initial spectra. The Fourier Transform module (FourierTransformTask) now accepts an optional spectralUnit string parameter to specify the desired output spectral unit. For example, if spectralUnit='GHz', then the output spectra will be in units of V/GHz versus GHz. If no unit is specified, the output spectra will be in units of V/(1/OPD_UNIT) versus 1/OPD_UNIT (the OPD unit is typically cm).
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It is now possible to specify the spectral unit of the initial spectra. The Fourier Transform module now accepts an optional spectralUnit string parameter to specify the desired output spectral unit. For example, if spectralUnit='GHz', then the output spectra will be in units of V/GHz versus GHz. If no unit is specified, the output spectra will be in units of V/(1/OPD_UNIT) versus 1/OPD_UNIT (the OPD unit is typically cm).
  To accommodate this new feature, all spectral modules now accept spectra and calibration data products in any unit of wavenumber or frequency. For example, if a module is provided with spectra in units of V/GHz versus GHz and a calibration product in units of cm-1, then the cm-1 calibration product will be converted to GHz, and the output spectra will be in GHz.

Bright Source Mode

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Two modules have been created for processing bright source mode observations: the PCAL Gain module (SpecApplyPcalGainTask) and the Bright Mode Gain module (SpecApplyBrightGainTask). Both of these modules are in the new herschel.spire.ia.pipeline.spec.gain package. The PCAL Gain module computes the ratio of a measured PCAL flash level separation to the mean PCAL flash separation measured on Dark Sky in Nominal Mode. The Bright Mode Gain module computes and then applies a wavenumber-dependent gain factor for observations which have been made using the Bright Source Mode.
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Two modules have been created for processing bright source mode observations. Both of these modules are in the new herschel.spire.ia.pipeline.spec.gain package:
  • The PCAL Gain module computes the ratio of a measured PCAL flash level separation to the mean PCAL flash separation measured on Dark Sky in Nominal Mode.
  • The Bright Mode Gain module computes and then applies a wavenumber-dependent gain factor for observations which have been made using the Bright Source Mode.

Phase Correction

  • The Phase Correction module's interface has been simplified. As before, the module provides three ways of applying phase correction, but executing the module is simpler now:
    1. From the observation data:
      sdi = phaseCorrection(sdi=sdi, avgSdi=avgSdi)
    2. From a calibration file:
      sdi = phaseCorrection(sdi=sdi, nonLinPhase=nonLinPhase)
    3. From a polynomial fit to the observation:
      sdi = phaseCorrection(sdi=sdi, sds=dsds, phaseCorrLim=phaseCorrLim,\
            polyDegree=2, pcfSize=64, convolApodName="aNB_15")
            polynomial fit to the observation

  • The Phase Correction module creates four new quality control metadata on the phase-corrected interferogram. These values will be used by the Quality Control module to assess observations:
    • phaseWrapSLW/SSW counts the number of times that in-band phase changes by +/-1.5pi in any of the nominal SLW/SSW detectors.
    • residualPhaseSLW/SSW gives the maximum absolute phase value (in units of degree) inside the phase correction limits in any of the nominal SLW/SSW detectors.
 

Interactive Analysis and Tools

 
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