Method and apparatus for measuring gaseous oxygen

Details Method and apparatus for measuring gaseous oxygen Method and apparatus for measuring gaseous oxygen

1982-02-05

1984-02-21

Kreitman, Stephen A.

Measuring and testing

Gas analysis

By vibration

324204, G01R 3314

Patent

active

044322267

ABSTRACT:
An oxygen detection system including two equal and symmetrically constructed major DC magnetic circuits each having an air gap which is alternatively filled with a sample and a reference gas. A magnetic bridge arm connects the major magnetic circuits in series opposition to derive a null response when the flux carried in the magnetic circuits is equal and a component of varying flux when the sample and reference gases are interchanged to cause an unequal flux to be developed in the circuits caused by a change in the reluctance across the gaps. An encircling inductance coil senses the flux in the null bridge arm which is electronically sampled in sychronism with the sample and reference gas interchange to develop a difference signal directly derived and proportional to the difference in magnetic susceptibility of the sample and reference gases. An active magnetic shield cancels stray fields from affecting the sensor.

REFERENCES:
patent: 2467211 (1949-04-01), Hornfeck
patent: 2689332 (1954-09-01), Greene
patent: 2944418 (1960-07-01), Engelhardt
patent: 3049665 (1962-08-01), Hummel
patent: 3389333 (1968-06-01), Wolff et al.
patent: 3720870 (1973-03-01), Sueda

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