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Information on XBT raw data observed at R/V MIRAI
(Cruise number : MR98-K01)
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1. Preface
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Using XBT (eXpendable Bathy Thermograph) system, the vertical distribution of water temperature 
is observed during free fall of its probe part in the seawater. On board, the analogue signal 
is converted to the temperature by data processor and the data is stored in PC. Depth data is 
calculated from the elapsed time.

2. System
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(1) Launcher 
     Hand launcher
      Manufacturer   : Sippican,Inc.
      Type           : LM-3A
      Operation area : Rear upper deck

     Automatic launcher   
      Manufacturer   : Tsurumi Seiki Co., LTD.
      Type           : AL-8
      Location       : Port side of rear   
                       The control panel is installed in the investigation room.

(2) Converter         
     Manufacturer    : Tsurumi Seiki Co., LTD.
     Type            : MK-30N 
     Location        : Investigation room
     Sampling rate   : 50 msec  

(3) XBT probe specifications
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     Type of probe                 TSK DeepBlue
     -------------------------------------------
     Range [deg-C]                 -2 to 35 
     Accuracy [deg-C]              +/- 0.2 
     Maximum depth [m]             760  
     Maximum elapsed time [sec]    123
     Rated ship speed [knot]       20
     Coefficient-a                 6.691
     Coefficient-b                 -2.25
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     'Coefficient-a' and 'Coefficient-b' presented in the above table are used in 
     the following equation, which is used for the depth calculation.
          Z = at + 10E-3 * bt^2 
     Where Z(m) is the depth and t(sec) is the elapsed time.