Patent ID: 9194788
Filing Date: 2015-11-24
Classification: G01N

Abstract:
1. A sensor device comprising: a first electrode being constituted of a porous body that has a plurality of holes in at least the vicinity of a surface of the first electrode, an average diameter of the plurality of the holes being in a range that allows for occurrence of a capillary condensation effect, the first electrode being integrated as a one piece, unitary metallic member, the first electrode including a first metallic material in which either a first passivation film is formed on a surface thereof or a first passivation film present on a surface thereof is lost, in association with changes in an environment of the site to be measured, the first metallic material having a first pH dependency with respect to at least one of formation and loss of the first passivation film; a second electrode spaced apart from the first electrode, the second electrode including a second metallic material in which either a second passivation film is formed on a surface thereof or a second passivation film present on a surface thereof is lost, in association with changes in the environment of the site to be measured, the second metallic material having a second pH dependency with respect to at least one of formation and loss of the second passivation film, the second pH dependency being different from the first pH dependency; and a functional element configured to measure a difference in electric potential between the first electrode and the second electrode, the sensor device being configured to measure a state of a site to be measured based on the difference in electric potential as measured by the functional element.