PDS_VERSION_ID                = PDS3
RECORD_TYPE                   = FIXED_LENGTH
RECORD_BYTES                  = 72
FILE_RECORDS                  = 44
^TABLE                        = "PHOTOSEN.TAB"

OBJECT                        = TABLE
  INTERCHANGE_FORMAT          = ASCII
  ROWS                        = 44
  ROW_BYTES                   = 72
  COLUMNS                     = 11
  DESCRIPTION                 = "This table contains data
     for the photosensor characteristics needed for
     radiometric calibration of the Viking Lander cameras.
     Data for all four flight cameras are tabulated in this
     file.  The data are taken from Huck et al., Radiometric
     Performance of the Viking Mars Lander Cameras, NASA TM
     X-72692, 1975."

  OBJECT                      = COLUMN
    NAME                      = LANDER_NUMBER
    DATA_TYPE                 = ASCII_INTEGER
    START_BYTE                = 1
    BYTES                     = 2
    FORMAT                    = "I2"
    DESCRIPTION               = "The number for the Viking
     Lander, either 1 or 2."
  END_OBJECT                  = COLUMN

  OBJECT                      = COLUMN
    NAME                      = CAMERA_NUMBER
    DATA_TYPE                 = ASCII_INTEGER
    START_BYTE                = 4
    BYTES                     = 2
    FORMAT                    = "I2"
    DESCRIPTION               = "The number for one of the
     cameras on a Viking Lander, either 1 or 2."
  END_OBJECT                  = COLUMN

  OBJECT                      = COLUMN
    NAME                      = FILTER_NAME
    DATA_TYPE                 = CHARACTER
    START_BYTE                = 8
    BYTES                     = 6
    DESCRIPTION               = "The commonly used name of
     an instrument filter.  In this case, it is the name
     used for a photodiode within the Viking Lander
     cameras."
  END_OBJECT                  = COLUMN

  OBJECT                      = COLUMN
    NAME                      = CALIBRATION_FACTOR
    DATA_TYPE                 = ASCII_REAL
    START_BYTE                = 16
    BYTES                     = 5
    FORMAT                    = "F5.2"
    DESCRIPTION               = "A factor to account for the
     differences between the camera model and calibration
     test hardware and the actual calibration test results."
  END_OBJECT                  = COLUMN

  OBJECT                      = COLUMN
    NAME                      = PREAMPLIFIER_FEEDBACK_RESISTANCE
    DATA_TYPE                 = ASCII_REAL
    START_BYTE                = 22
    BYTES                     = 7
    FORMAT                    = "F7.2"
    UNIT                      = MEGAOHMS
    DESCRIPTION               = "The resistance of the
     preamplifier feedback resistor for a given photodiode."
  END_OBJECT                  = COLUMN

  OBJECT                      = COLUMN
    NAME                      = CHANNEL_GAIN
    DATA_TYPE                 = ASCII_REAL
    START_BYTE                = 30
    BYTES                     = 6
    FORMAT                    = "F6.2"
    DESCRIPTION               = "The ratio of summing
     amplifier feedback resistance to the input resistance
     for a given photodiode (channel)."
  END_OBJECT                  = COLUMN

  OBJECT                      = COLUMN
    NAME                      = APERTURE_RADIUS
    DATA_TYPE                 = ASCII_REAL
    START_BYTE                = 37
    BYTES                     = 6
    FORMAT                    = "F6.2"
    UNIT                      = MICROMETERS
    DESCRIPTION               = "The radius for the aperture
     of a given photodiode."
  END_OBJECT                  = COLUMN

  OBJECT                      = COLUMN
    NAME                      = INSTANTANEOUS_FIELD_OF_VIEW
    DATA_TYPE                 = ASCII_REAL
    START_BYTE                = 44
    BYTES                     = 9
    FORMAT                    = "F9.6"
    UNIT                      = DEGREES
    DESCRIPTION               = "The angular size of the
     photodiode field of view."
  END_OBJECT                  = COLUMN

  OBJECT                      = COLUMN
    NAME                      = LENS_DIAMETER
    DATA_TYPE                 = ASCII_REAL
    START_BYTE                = 54
    BYTES                     = 5
    FORMAT                    = "F5.2"
    UNIT                      = CENTIMETERS
    DESCRIPTION               = "The diameter of the lens in
     front of the photosensor array."
  END_OBJECT                  = COLUMN

  OBJECT                      = COLUMN
    NAME                      = LENS_FOCAL_LENGTH
    DATA_TYPE                 = ASCII_REAL
    START_BYTE                = 60
    BYTES                     = 5
    FORMAT                    = "F5.2"
    UNIT                      = CENTIMETERS
    DESCRIPTION               = "The focal length of the
     lens in front of the photosensor array."
  END_OBJECT                  = COLUMN

  OBJECT                      = COLUMN
    NAME                      = IN_FOCUS_DISTANCE
    DATA_TYPE                 = ASCII_REAL
    START_BYTE                = 66
    BYTES                     = 5
    FORMAT                    = "F5.1"
    UNIT                      = METERS
    DESCRIPTION               = "The distance from the
     camera that an object is in focus.  This distance is a
     function of the focal length of the camera lens and the
     distance between the lens and a given photodiode."
  END_OBJECT                  = COLUMN

END_OBJECT                    = TABLE
END