PARAMAGNETIC OXYGEN DETECTION WITH AN ULTRASONIC RESONATOR

Authors
OEHLER O EGLI P NIZZOLA P SCHNEIBEL HP UEBERSAX M WURGLER C
Citation
O. Oehler et al., PARAMAGNETIC OXYGEN DETECTION WITH AN ULTRASONIC RESONATOR, Helvetica Physica Acta, 66(4), 1993, pp. 433-434
Citations number
4
Categorie Soggetti
Physics
Journal title
Helvetica Physica Acta → ACNP
ISSN journal
00180238
Volume
66
Issue
4
Year of publication
1993
Pages
433 - 434
Database
ISI
SICI code
0018-0238(1993)66:4<433:PODWAU>2.0.ZU;2-W
Abstract
The presented method for the selective detection of oxygen is based on the measurement of periodic variations in the velocity of sound. Thes e variations are induced in an oxygen-containing gas sample by the att raction of the paramagnetic oxygen molecules in a modulated inhomogene ous magnetic field. The variations in the velocity of sound are measur ed by detuning an ultrasonic resonator. At a modulation frequeny of th e magnetic field of 20 Hz and a time constant of 1 s a S/N ratio of 47 was found.