Patent ID: 8749789
Filing Date: 2014-06-10
Classification: G01N

Abstract:
1. A gas concentration measuring apparatus for measuring a concentration of a measurement target substance contained in a sample gas, the gas concentration measuring apparatus comprising: a light source unit having a light source; a sample cell unit that is arranged on an optical path of the light source and configured to receive a sample gas; a sensor unit that is arranged on an optical path of the light source and includes a concentration measuring sensor configured to receive light from the light source after the light has passed through the sample cell unit and measure a concentration of the measurement target substance; and an introducing device configured to discharge the sample gas from the sample cell unit, supply the discharged sample gas to a vicinity of the sensor unit or the light source unit, and fill an inside of the sensor unit or the light source unit with an atmosphere of the sample gas; the introducing device including a cover that covers a gap formed at a boundary of the sample cell unit, a boundary of the sensor unit, or a boundary of the light source unit from an outer periphery of the sample cell unit, the sensor unit, or the light source unit, and the introducing device further including a flow passage that connects the sample cell unit to the cover.