Oxygen sensing method and apparatus
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United States of America Patent
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May 7, 1991
Issued Date -
N/A
app pub date -
Jan 16, 1990
filing date -
Oct 3, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Apparatus for measuring concentration of a paramagnetic gas in a gas mixture includes first and second magnet pole pieces positioned adjacent each other with a selected gap therebetween, for generating an inhomogeneous magnetic field. The pole pieces have a selected sectional shape, and a gap-facing surface with a selected configuration, that provide an elongated region of maximum magnetic field intensity in the gap. Electrically heated magnetic wind generating thermistors are positioned in the gap. Electrically heated magnetic wind sensing thermistors are positioned adjacent to the magnetic wind generating thermistors, proximate to the elongated region of maximum magnetic field intensity, such that a heated region associated with the wind generating and wind sensing thermistors is substantially encompassed by the elongated region of maximum magnetic field intensity. Consequently, only gas substantially within the region of maximum magnetic field intensity is subjected to heating and reduction of magnetic susceptibility, whereby gas outside the region of maximum magnetic field intensity is attracted with a selected maximum force.
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