摘要: A quadrupole mass spectrometer was used on STS-4 to measure the water vapor concentration in the Shuttle's vicinity. During the flight, the water concentration varied by at least a factor of 100, and correlated very well with the ... 展开 A quadrupole mass spectrometer was used on STS-4 to measure the water vapor concentration in the Shuttle's vicinity. During the flight, the water concentration varied by at least a factor of 100, and correlated very well with the temperature of the bay. Water dumps and Shuttle attitude had little effect on the measured water signals. Estimates of total water concentration can be made from both the ion mode and the neutral data. Though the two types of data show qualitatively similar behavior, there is not enough ion mode data to confirm the detailed trends observed in the neutral mode. The ion mode and neutral mode estimates appear to bracket the true water concentration. A lower limit estimate of the highest water concentration at the instrument is 5 x 10 to the - 7th Torr. Keywords: Spacecraft contamination; Shuttle environment; Water; Mass spectrometer. Reprints. (MJM) 收起