PDS_VERSION_ID                     = PDS3
RECORD_TYPE                        = "STREAM"
LABEL_REVISION_NOTE                = "2006-04-21 GEO:JGW INITIAL;
                                     2007-11-13 EN:BJS, replaced
                                     N/A in insthostid with BUGLAB"

OBJECT                             = INSTRUMENT
 INSTRUMENT_ID                     = "BUG"
 INSTRUMENT_HOST_ID                = "BUGLAB"

 OBJECT                            = INSTRUMENT_INFORMATION
  INSTRUMENT_NAME                  = "BLOOMSBURG UNIVERSITY GONIOMETER"
  INSTRUMENT_TYPE                  = "RELFECTANCE SPECTROMETER"
  INSTRUMENT_DESC                  = "

  Instrument Overview
  ===================

  Goniometer

  A photometric goniometer measures the reflected light properties of
  surfaces from a variety of illumination and viewing positions. The majority
  of goniometers being used for planetary applications are limited, either by
  design or use, to measurements in the principal (or scattering) plane. The
  Bloomsburg University Goniometer (BUG) instrument was designed to measure
  the scattering properties over the entire upper hemisphere. Additionally,
  it is an automated system that utilizes stepper motors and motion control
  and measurement software. The light source is a 100W quartz-tungsten-
  halogen research grade lamp. The output light is filtered using 50nm FWHM
  interference filters within the visible and near-infrared (400-1000 nm
  range), then chopped and focused into a glass fiber-optic bundle. The fiber
  optic cable terminates at the top of one of the two arms (incidence arm)
  with a collimating lens assembly, where it is then directed onto the
  sample. The source arm is capable of incidence angles of 0-65 degrees
  (depending on sample size), and also swivels in azimuth from 0-170 deg. The
  reflected light is detected by a silicon-detection system which is 'locked
  in' to the chopper, and provides very stable, low noise measurements, even
  in low-level ambient light. The detector is mounted on the longer arm
  (emission arm) and is capable of emission angles of -80 to +80 deg. The
  degree of movement described here allows a complete half-hemisphere of
  scattered light to be measured (including the principal plane). For
  isotropic samples, the other half-hemisphere is theoretically the mirror
  image (across the principal plane) of that measured, and this is checked at
  selected places. The width of the collimating lens and its distance from
  the sample limits the phase angle to a minimum of 3.0 deg (the detector is
  occulted by the optics at smaller phase angles). The maximum useful phase
  angle is 145 deg.

  CCD Camera System

  For documentation purposes, a Panasonic CCD color video camera is used to
  capture images of the surface. A 10x closeup zoom lens allows the field-of-
  view (FOV) and highest resolution to be controlled. Tests with the system
  show that resolutions as high as 60um are possible (15um pixels) at a 1cm
  FOV.

  Spectrograph

  A single-grating spectrograph (Oriel Corp. FICS/Linespec system) is also
  available to document the characteristics of each sample. Spectral coverage
  is 400-1000nm with spectral resolutions of ~6nm.

  For further details, please see the SHEPARD2001 reference in
  CATALOG/REF.CAT and at 
  http://www.lpi.usra.edu/meetings/lpsc2001/pdf/1015.pdf.
  
  "

 END_OBJECT                        = INSTRUMENT_INFORMATION

 OBJECT                            = INSTRUMENT_REFERENCE_INFO
  REFERENCE_KEY_ID                 = "SHEPARD2001"
 END_OBJECT                        = INSTRUMENT_REFERENCE_INFO

END_OBJECT                         = INSTRUMENT
END