Gas sensor

Abstract

A gas sensor is provided in which size of a filter can be decreased and optical path design is facilitated. The gas sensor includes: a light source (20) that has an active layer; a first sensor (32) disposed so that light emitted from the light source is incident thereon, configured to detect a state of a space; a second sensor (31) disposed so that light emitted from the light source is incident thereon, used to compensate for temperature variation or elapsed time variation of the first sensor; a first wavelength limiter configured to limit wavelengths of light emitted from the active layer that reach the first sensor and the second sensor, connected to the light source without the space intervening; and a second wavelength limiter configured to limit wavelengths of light emitted from the active layer that reach the second sensor, connected to the second sensor without the space intervening.

Dependencies are inferred from the claim text.