Device and method for real-time monitoring of accidental damage

Details Device and method for real-time monitoring of accidental damage Device and method for real-time monitoring of accidental damage

1991-12-10

1993-08-31

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

Specific condition

340659, 340635, 204147, 204196, G08B 2100

Patent

active

052413012

ABSTRACT:
A method for monitoring damage to the protective covering of immersed or underground metal structures subjected to cathodic protection, based on the electrical resistance offered by said covering, and consisting of modulating the cathodic protection feed current and measuring the corresponding potential variation due to the ohmic loss, said resistance being obtained from the ratio of potential variation to modulation current, to activate an alarm system on sudden fall and rise in ohmic resistance due to accidental events.

REFERENCES:
patent: 4255242 (1981-03-01), Freeman

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