Measuring and testing – Gas analysis – By vibration
Patent
1988-10-03
1990-01-16
Chapman, John
Measuring and testing
Gas analysis
By vibration
G01N 2774
Patent
active
048934950
ABSTRACT:
Oxygen sensing apparatus and methods utilize a sensing cell including two pairs of electrically heated thermistors and a source of an inhomogeneous magnetic field. One thermistor of each pair is positioned inside the magnetic field, and the second thermistor of each pair is positioned adjacent to the respective first thermistor of each pair, substantially outside the magnetic field. When oxygen is present in the sensing cell, the thermistors inside the magnetic field generate a gas flow in the direction of the adjacent thermistors of each pair positioned outside the magnetic field, thus tending to reduce the temperature of the thermistors inside the field and increase the temperature of the thermistors outside the field. The thermistors are connected in a measuring bridge circuit including elements for maintaining the temperature of the thermistors at a substantially constant level, thereby providing a signal that can be used to compensate for changes in the thermal characteristics of the background gases.
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Chapman John
Panametrics, Inc.
Roskos Joseph W.
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