PDS_VERSION_ID       = PDS3                                                   
RECORD_TYPE          = STREAM                                                 
                                                                              
OBJECT               = INSTRUMENT                                             
  INSTRUMENT_HOST_ID = "SDU"                                                  
  INSTRUMENT_ID      = "DFMI"                                                 
                                                                              
  OBJECT             = INSTRUMENT_INFORMATION                                 
    INSTRUMENT_NAME  = "DUST FLUX MONITOR INSTRUMENT"                         
    INSTRUMENT_TYPE  = "DUST IMPACT DETECTOR"                                 
    INSTRUMENT_DESC  = "                                                      
                                                                              
        THE DUST FLUX MONITOR INSTRUMENT (DFMI) FOR THE                       
               STARDUST MISSION TO COMET WILD-2                               
                                                                              
        The DUST FLUX MONITOR INSTRUMENT (DFMI) is part of the                
        STARDUST instrument payload. The prime goal of the DFMI is            
        to measure the particle flux, intensity profile, and mass             
        distribution during passage through the coma of Comet Wild-2          
        in 2004. This information is valuable for assessment of               
        spacecraft risk and health, and also for interpretation of            
        the laboratory analysis of dust captured by the Aerogel dust          
        collectors and returned to Earth. At the encounter speed of           
        6.1 km/s, the DFMI measurements will extend over the                  
        particle mass range of 8 decades, from 10^-11 to >10^-3 g. A          
        secondary science goal is to measure the particle flux and            
        mass distribution during the ~7 year interplanetary portions          
        of the mission, where, in addition to measurements of the             
        background interplanetary dust over the radial range 0.98 AU          
        to 2.7 AU, multiple opportunities exist for possible                  
        detection by the DFMI of interplanetary particles,                    
        meteor-stream particles, and interstellar dust. The DFMI              
        consists of two different dust detector systems --  a                 
        polyvinylidene fluoride (PVDF) DUST SENSOR UNIT (SU), which           
        measures particles with mass < ~10^-4 g, and a DUAL ACOUSTIC          
        SENSOR SYSTEM (DASS), which utilizes two quartz piezoelectric         
        accelerometers mounted on the first two layers of the                 
        spacecraft Whipple dust shield to measure the flux of                 
        particles with mass > 10^-4 g. The large Whipple shield               
        structures provide the large effective sensitive area                 
        required for detection of the expected low flux of high-mass          
        particles.                                                            
                                                                              
        For more information on the specific characteristics of the           
        DFMI instrument, consult the documentation in the /EXTRAS             
        directory in this archive."                                           
  END_OBJECT                          = INSTRUMENT_INFORMATION                
                                                                              
  OBJECT    = INSTRUMENT_REFERENCE_INFO                                       
    REFERENCE_KEY_ID = "N/A"                                                  
  END_OBJECT = INSTRUMENT_REFERENCE_INFO                                      
END_OBJECT                            = INSTRUMENT                            
END