EP 0042789 B1 19850918 - METHOD FOR THE IN SITU AND CONTINUOUS HIGH-SENSIBILITY MEASURING OF CONCENTRATIONS OF GAS AND VOLATILE PRODUCTS, AND APPARATUS FOR CARRYING IT OUT
Title (en)
METHOD FOR THE IN SITU AND CONTINUOUS HIGH-SENSIBILITY MEASURING OF CONCENTRATIONS OF GAS AND VOLATILE PRODUCTS, AND APPARATUS FOR CARRYING IT OUT
Publication
Application
Priority
FR 8013776 A 19800620
Abstract (en)
[origin: US4442353A] 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.
IPC 1-7
IPC 8 full level
G01N 27/62 (2006.01); H01J 49/04 (2006.01); H01J 49/24 (2006.01)
CPC (source: EP US)
H01J 49/24 (2013.01 - EP US)
Designated contracting state (EPC)
AT CH DE GB IT LI
DOCDB simple family (publication)
EP 0042789 A1 19811230; EP 0042789 B1 19850918; AT E15722 T1 19851015; CA 1170079 A 19840703; DE 3172323 D1 19851024; FR 2485201 A1 19811224; FR 2485201 B1 19840309; JP S5774656 A 19820510; US 4442353 A 19840410
DOCDB simple family (application)
EP 81400967 A 19810617; AT 81400967 T 19810617; CA 380247 A 19810619; DE 3172323 T 19810617; FR 8013776 A 19800620; JP 9017381 A 19810611; US 27516481 A 19810619