Patent ID: 9442060
Filing Date: 2016-09-13
CPC Classification: G01N

Claim Text:
1. A sensor device comprising: a first electrode including a first metallic material, the first metallic material being a metallic material in which either a first passivation film is formed on a surface thereof or the first passivation film present on the surface thereof is lost, in association with changes in an environment of a measurement site; a second electrode including a second metallic material different from the first metallic material, the second electrode being spaced apart from the first electrode with the first electrode and the second electrode being disposed on a same plane; an insulating layer configured such that the first electrode and the second electrode are mounted thereon; a functional element configured to measure a difference in electric potential between the first electrode and the second electrode that changes depending on presence or absence of the first passivation film; and a sealing part defining an opening such that at least part of the first electrode and at least part of the second electrode are exposed from the opening, the sensor device being disposed inside a concrete structure, the concrete structure including a reinforcing bar disposed parallel to a surface of the concrete structure, the first electrode being formed of a plurality of first sub electrodes, with the plurality of first sub electrodes being arranged in a first direction, the second electrode being formed of a plurality of second sub electrodes, with the plurality of second sub electrodes being arranged in a second direction, the first direction and the second direction being perpendicular to the surface of the concrete structure and the reinforcing bar, and the sensor device being disposed between the surface of the concrete structure and the reinforcing bar.