Correction method for an electromagnetic induction-type probe

Details Correction method for an electromagnetic induction-type probe Correction method for an electromagnetic induction-type probe

1995-12-27

1997-09-09

Wieder, Kenneth A.

Electricity: measuring and testing

Electrolyte properties

Using a conductivity determining device

324601, G01N 2702, G01R 2700, G01R 3500

Patent

active

056660588

ABSTRACT:
A method is used which reduces measurement errors, especially of permittivity, which result when electromagnetic induction-type probes measure electrical properties of solutions. Part of the electromagnetic induction current, which the electromagnetic induction-type probe tries to induce in the test solution, flows in the stray capacitance, which is formed by the dielectric in the probe. This partial current reduces the current that is linked to the current detector transformer, and affects the measured value of the electrostatic capacity component, i.e., the permittivity, of the test solution. This phenomenon is modeled and is expressed by a distributed constant circuit which is simplified to a T-shaped 2-terminal pair equivalent circuit. A correction equation that corrects the errors due to the aforementioned currents is obtained by means of this simplified equivalent circuit, and the measurement errors are reduced. Co is the probe's stray capacitance and is evaluated by substituting the correction equation for the measured value of a standard solution. By this means, measurement errors can be reduced to 1/10 of their uncorrected value.

REFERENCES:
patent: 3151293 (1964-09-01), Blake et al.
patent: 3389332 (1968-06-01), Ketcham
patent: 3510761 (1970-05-01), Brown
patent: 5003267 (1991-03-01), Coleman
patent: 5268642 (1993-12-01), Uchidomi
patent: 5341102 (1994-08-01), Akiyama et al.

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