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PP Sensors on Rosetta Philae

The PP instrument as part of the SESAME instrument group uses 3 transmitter electrodes and 2 receiver electrodes distributed around Lander structure elements or payloads in contact with the comet surface. The receivers are built into the soles of the +Y and -Y feet of the landing gear. One of the transmitter electrodes is in the sole of the +X foot of the landing gear, one electrode is built as a mesh attached to the MUPUS PEN hammered into the surface material of the comet during its deployment. The lid of the APXS detector forms the third transmitter electrode which can be used whenever APXS is lowered to the comet surface. Whenever the host detector is not powered the attached electrode can be used for PP measurements. The images below show the location of the electrodes and the electrodes themselves: attached to landing gear feet, to the MUPUS PEN and the APXS detector, respectively.

 

PP electrodes attached to the Philae Lander
SESAME sensors with PP electrodes, DIM cube and CASSE detectors attached to the Philae Lander.
Landing gear foot with PP electrodes, credit DLR Cologne
MUPUS PEN with PP electrode mesh, credit DLR
APXS-detector with PP electrode ring, credit ESA
PP control electronics; credit FMI

Field campaign in Dachstein Caves

The PP-team colleagues from Paris performed a filed campaign with the PP full-scale mockup model in the ice caves of the Dachstein mountains in the Austrian Alps from 12 to 16 April 2014.

For comparison the reference model from the CASSINI/Huygens project to Saturn's moon Titan including the multi impedance probe was also brought to the cave and performed measurements in parallel.

Images from the Dachstein Caves and PP + Huygens equipment