Sensor device

Abstract

A sensor device includes a first electrode, a second electrode, a gap forming member and a functional element. The first electrode is composed of a first metallic material. The second electrode is spaced apart from the first electrode, and composed of a second metallic material. The gap forming member is arranged with a gap being formed between the gap forming member and a portion of a surface of the first electrode. The functional element is configured and arranged to measure a difference in electric potential between the first electrode and the second electrode so that a state of a measurement site to be measured is measured based on the difference in electric potential as measured by the functional element.

What is claimed is: 
     
         1 . A sensor device comprising:
 a first electrode composed of a first metallic material;   a second electrode spaced apart from the first electrode, and composed of a second metallic material;   a gap forming member arranged with a gap being formed between the gap forming member and a portion of a surface of the first electrode; and   a functional element configured and arranged to measure a difference in electric potential between the first electrode and the second electrode so that a state of a measurement site to be measured is measured based on the difference in electric potential as measured by the functional element.