Error analysis of Galileo Probe Mass Spectrometer atmospheric mixing ratio measurements

Details Error analysis of Galileo Probe Mass Spectrometer atmospheric mixing ratio measurements Error analysis of Galileo Probe Mass Spectrometer atmospheric mixing ratio measurements

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999dps....31.5201w&link_type=abstract

American Astronomical Society, DPS meeting #31, #52.01

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Scientific paper

Ratios of Galileo Probe Mass Spectrometer (GPMS) counts are required to derive mixing ratios of atmospheric gases. To obtain the mixing ratio of a gas X (q_X), we divide counts at the atomic mass of X (C_X) by counts at the atomic mass of a chosen reference gas (C_ref). Detector deadtime has a large effect at high counting rates. A constant, tau_DT , characterizes the deadtime correction, but we solve a transcendental equation to obtain the corrected counts, so propagation of error from tau_DT to error in mixing ratios is not straightforward. We discuss selection of the best values of tau_DT , and estimate the uncertainty in tau_DT . We also discuss the selection of reference gases to minimize deadtime and other errors, and we estimate the effect of choice of reference gas and error in tau_DT on the error in the count ratio C_X/C_ref. A laboratory-derived calibration factor (cc_X) is needed to convert GPMS C_X/C_ref into mixing ratio q_X. Deadtime corrections are also used in the calibration experiments, introducing a source of error in cc_X. In addition, the pressure dependence of cc_X for some gases is another source of error. We discuss difficulties with parametrizing the pressure dependence of cc_X. We examine sources of error in calibration constants for hydrogen sulfide and methane as an example, and finally derive Error Bars for q_H_2S and q_CH_4 on Jupiter as measured by the GPMS.

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