Patent ID: 8934101
Filing Date: 2015-01-13
Classification: G01N

Abstract:
1. A gas analysis apparatus configured to analyze concentrations of element gases in a sample gas flowing in a flue, the gas analysis apparatus comprising: a light-emitting unit arranged outside a wall of the flue and configured to apply a measurement light to the sample gas; a first reflector configured to reflect the measurement light applied from the light-emitting unit and that has been transmitted through the sample gas; a light-receiving unit arranged in the vicinity of the light-emitting unit and outside the wall of the flue, and configured to receive the measurement light reflected by the first reflector; a second reflector arranged outside the wall of the flue and configured to reflect the measurement light to the light-receiving unit; a known substance containing unit arranged in a space region along a light path between the light-emitting unit and the second reflector and between the second reflector and the light receiving unit, the known substance containing unit containing a known substance that allows the measurement light applied from the light-emitting unit not to be attenuated or to be attenuated by a predetermined amount; a computing unit configured both to analyze the concentrations of the element gases in the sample gas using the measurement light reflected by the first reflector and to perform at least one of a correction and a calibration with the known substance using the measurement light reflected by the second reflector; and a switching unit arranged outside the wall of the flue and configured to remove the second reflector from the light path when performing the analysis of the concentrations of the element gases and to place the second reflector into the light path when performing at least one of the correction and the calibration.