| 摘要 |
PROBLEM TO BE SOLVED: To suppress the influence of a thermal lens effect phenomenon and improve measurement accuracy, in a gas analyzer provided with a probe for gas analysis in which the concentration of sample gas flowing in a pipe is measured by an optical measurement system.SOLUTION: A gas analyzer comprises: a probe tube 11 arranged by intersecting with a flow channel of sample gas in a pipe, to introduce sample gas flowing in the pipe into a predetermined measurement area in an internal hollow; a light emitting part and a light receiving part that irradiate the measurement area in the probe tube 11 with measurement light and receive measurement light having passed through the sample gas in the measurement area; and a purge gas supply tube 26 that is arranged in the probe tube 11 to supply an area between those optical system members and the measurement area with purge gas and that is arranged spaced from an inner wall surface of the probe tube 11. |
