Computer Science
Scientific paper
Jan 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975stin...7517638k&link_type=abstract
Test evaluation of potential heatshield contamination of an outer planet probe's gas sampling system NASA
Computer Science
Air Sampling, Heat Shielding, Outer Planets Explorers, Angle Of Attack, Contaminants, Measuring Instruments, Outgassing, Planetary Atmospheres
Scientific paper
The feasibility of retaining the heat shield for outer planet probes was investigated as a potential source of atmospheric sample contamination by outgassing. The onboard instruments which are affected by the concept are the pressure sensor, temperature sensor, IR detector, nephelometer, and gas sampling instruments. It was found that: (1) The retention of the charred heatshield and the baseline atmospheric sampling concepts are compatible with obtaining noncontaminated atmospheric samples. (2) Increasing the sampling tube length so that it extends beyond the viscous boundary layer eliminates contamination of the atmospheric sample. (3) The potential for contamination increases with angle of attack.
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