Corrosion monitoring system

Details Corrosion monitoring system Corrosion monitoring system

2006-06-13

2006-06-13

Deb, Anjan (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S691000, C324S603000, C204S404000

Reexamination Certificate

active

07061255

ABSTRACT:
A system for monitoring corrosion in metal by comparing a test sample exposed to a corrosion causing environment and a reference sample exposed to a protected environment. An AC voltage source generates a square wave signal oscillating between ground and voltage Vcc and a filter is positioned to filter the signal to produce a sine wave with no second harmonic component. A voltage-driven current source and inverting amplifier produce a current referenced to 0.5 Vcc to provide an AC current from the drive voltage driven sinusoidally and symmetrically above and below 0.5 Vcc. A transformer steps up the AC current and thereafter transmits the current through the samples to an amplifier for amplifying the current to provide outputs in a ratio representing the degree of corrosion of the reference sample. The system can operate in situ for on site measurement and uses relatively low current to permit long operation.

REFERENCES:
patent: 4217544 (1980-08-01), Schmidt
patent: 4498044 (1985-02-01), Horn
patent: 4587479 (1986-05-01), Rhoades et al.
patent: 5446369 (1995-08-01), Byrne et al.
patent: 5854557 (1998-12-01), Tiefnig
patent: 6831469 (2004-12-01), Foreman et al.

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