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1. Spectrometer Bolometer Parameter Table _SCalSpecBolPar_

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					1. Spectrometer Bolometer Parameter Table
(SCalSpecBolPar)
    • Name in DP

      SCalPhotBolPar, SCalSpecBolPar

    • File Description

      This file will contain all fixed detector parameters required to do the detector processing. Before
      launch these will be populated from a combination of the JPL EIDP values and those measured
      during PFM5. Some of these parameters will be updated following testing during PV phase. The
      file contains more parameters than are neccessary for the current pipeline implementation. The
      extra parameters would be needed by the model based pipeline, were it to be implemented.

    • Time Evolution

      This may be time dependent in the sense of a particular set of parameters applying for a specified
      time period although the expectation is that the same set of parameters should be applicable for
      the whole mission.

    • Format

      One tableDataset per array with columns:

      channelName, loadResPos, loadResNeg, resR0, delta, capac, condG0, beta.

      The reference temperature for the bolometer thermal conductivity is stored in the metadata for
      each table: tempT0.

      The full description of each column in the table is as follows:


      • loadResPos (Rload+): load resistance on positive bias side of bolometer

      • loadResNeg (Rload-): load resistance on negative bias side of bolometer

      • resR0 (R0): constant resistance parameter used to calculate bolometer temperature from
        Rbolo: the resistance at temperature delta

      • delta (): parameter used to calculate bolometer temperature from Rbolo: the reference tem-
        perature for the bolometer resistance (in units of K)

      • capac (C): electrical cable capacitance, used to calculate the RC roll off correction

      • condG0 (G0) : bolometer thermal conductivity at temperature T0

      • beta (): the power law index for relationship between thermal conductance and temperature



    Table 1. SCalSpecBolPar Product Format
    product (type=''SCalSpecBolPar'', description=''Spectrometer Bolometer Parameter Table'')
    class: herschel.spire.ia.dataset.SpecBolPar
      metadata:
           creator Creator, String
     creationDate Creation Date, units=''UTC'', Date
       instrument Instrument, String

                                                1
                            Spectrometer Bolometer Parameter Table
                                      (SCalSpecBolPar)

     modelName Instrument Model Name, String
     startDate Start Date, units=''UTC'', Date
          endDate End Date, units=''UTC'', Date
          version Version, String
               SSW SSW Pixels, table dataset
                     metadata:
                      tempT0 Reference Temperature for Bolometer Thermal Conductivity, units =
                               ''K'', Double
                          names Channel Names, String
              loadResPos Load resistance (+ve bias), units = ''Ohms'', Double1d
              loadResNeg Load resistance (-ve bias), units = ''Ohms'', Double1d
                          resR0 Bolometer Electric Resistance at Temperature delta, units = ''Ohms'',
                                Double1d
                          delta Reference Temperature for Bolometer Resistance, units = ''K'',
                                Double1d
                          capac Electrical Capacitance of Cable, units = ''F'', Double1d
                         condG0 Thermal Conductivity at Temperature T0, units = ''W/K'', Double1d
                           beta Exponent for Temperature evolution of Bolometer Thermal Conduct-
                                ivity, Double1d
               SLW SLW Pixels, table dataset
                     metadata:
                      tempT0 Reference Temperature for Bolometer Thermal Conductivity, units =
                               ''K'', Double
                          names Channel Names, String
              loadResPos Load resistance (+ve bias), units = ''Ohms'', Double1d
              loadResNeg Load resistance (-ve bias), units = ''Ohms'', Double1d
                          resR0 Bolometer Electric Resistance at Temperature delta, units = ''Ohms'',
                                Double1d
                          delta Reference Temperature for Bolometer Resistance, units = ''K'',
                                Double1d
                          capac Electrical Capacitance of Cable, units = ''F'', Double1d
                         condG0 Thermal Conductivity at Temperature T0, units = ''W/K'', Double1d
                           beta Exponent for Temperature evolution of Bolometer Thermal Conduct-
                                ivity, Double1d
    history
                ... ..


This table gives a full description of each of the parameters (both metadata keywords and column
names) used in the product format table.


Table 2. SCalSpecBolPar Metadata and Column Name Descriptions
Data Item                             Description
version                               Version of the Calibration Table
tempT0                                T0 : reference Temperature for Bolometer Thermal Conductivity.
names                                 Unique name for each channel. For example detector C5 on the
                                      PLW array would be 'PLWC5'.
loadResPos                            Rload+: load resistance on positive bias side of bolometer.


                                                2
             Spectrometer Bolometer Parameter Table
                       (SCalSpecBolPar)

Data Item             Description
loadResNeg            Rload-: load resistance on negative bias side of bolometer.
resR0                 R0: constant resistance parameter used to calculate bolometer
                      temperature from Rbolo: the resistance at temperature #
delta                 #: parameter used to calculate bolometer temperature from Rbolo:
                      the reference temperature for the bolometer resistance (in units of
                      K).
capac                 C: electrical cable capacitance, used to calculate the RC roll off
                      correction.
condG0                G0 : bolometer thermal conductivity at temperature T0
beta                  #: the power law index for relationship between thermal conduct-
                      ance and temperature.




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posted:1/28/2011
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