High-precision method and apparatus for in-situ continuous measu

Details High-precision method and apparatus for in-situ continuous measu High-precision method and apparatus for in-situ continuous measu

1981-06-19

1984-04-10

Anderson, Bruce C.

Radiant energy

Ionic separation or analysis

250282, 250288, B01D 5944

Patent

active

044423535

ABSTRACT:
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.sup.-2 to 10.sup.-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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patent: 2721270 (1955-10-01), Bennett
patent: 3895231 (1975-07-01), Sodal et al.
"Outer Planets Atmosphic Entry Probes: Science Obj. and Payloads", Myers, Jour. of Spacecraft & Rockets, vol. 13, No. 12, pp. 712-718, Dec. 1976.
"A Tech. for Fast and Reproducible Fingerprinting of Bacteria by Pyrolysis Mass Spect.", Meuzelaar et al., Anal. Chem., vol. 45, No. 3, Mar. 1973.

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