Electricity: measuring and testing – Magnetic – Fluid material examination
Patent
1994-02-28
1996-02-20
O'Shea, Sandra L.
Electricity: measuring and testing
Magnetic
Fluid material examination
324225, 73 2502, G01N 2774, G01R 3312
Patent
active
054932157
ABSTRACT:
An apparatus for determining the paramagnetic characteristics of substances such as oxygen includes a cuvette rotating in a magnetic field. The cuvette includes measuring chambers and reference chambers and an alternating voltage is induced in the measuring field coils by the rotation of the cuvette along the magnetic field. A base signal disturbing the measuring signal is also generated. This base signal is caused primarily by changes in the thickness of the material in the reference chambers and the measuring chambers and/or by material thickness changes of the cuvette. To eliminate this base signal, the cuvette includes a magnetic compensating device. This device is mounted at such a position that it generates a compensating magnetic field during its rotation through the magnetic field. This compensating field generates a compensating voltage which has the same amplitude as the base signal but has a signal waveform which is opposite in phase to the base signal.
REFERENCES:
patent: 2467211 (1949-04-01), Hornfeck
patent: 2689332 (1954-09-01), Greene
patent: 4763509 (1988-08-01), Albarda et al.
patent: 4950984 (1990-08-01), Otten et al.
Dragerwerk Aktiengesellschaft
O'Shea Sandra L.
Ottesen Walter
Patidar Jay M.
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