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process for in situ and continuous measurement with high sensitivity of gas concentrations and fluechtigen products and device for implementation of the procedure.
process for in situ and continuous measurement with high sensitivity of gas concentrations and fluechtigen products and device for implementation of the procedure.
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机译:原位连续测量方法,具有高灵敏度的气体浓度和氟化物产品,以及执行该程序的装置。
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摘要
Continuous monitoring of variations in the concentrations of individual components in gaseous mixtures such as, more particularly, gases released from volcanic vents, is achieved in the field with consistently high precision, namely about 2 ppm, over extended periods of time, while the time lag for detecting a variation is minimized. On-site measurements are made with a portable apparatus, comprising a sampling probe from which the gas is led to an expansion enclosure maintained at a regulated pressure of about 10-2 to 10-1 millibar. From this enclosure, the gas is metered by means of a piezoelectric valve into the analyzing chamber of a quadrupole mass-spectrometer. Several units operating in the field, directly over the volcanic vents, may be connected to a central data processing station, so as to derive useful correlations for predicting future volcanic activity, for monitoring geothermal sources, and for detecting gas-release anomalies for purposes of geophysical exploration.
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