| 摘要 |
In spectroscopic devices the sections of an optical measuring path from a light source to a measuring volume containing a measuring gas and from there to a measuring detector are often sealed off from the ambient atmosphere and purged with a purge gas such as dry nitrogen to prevent penetration of atmospheric gas components, such as water vapor, which may interfere with the trace gas measurement. The moisture content in the nitrogen supply is usually in the range of a few ppm at the gas source and can increase dramatically at the measuring site depending on the length of the nitrogen pipe net and due to porosity of the pipe walls, leakage of seals and residual moisture trapped in so-called dead legs. In order to compensate interfering absorption of atmospheric gas components and other impurities in the purge gas (22) the purge gas (22) is collected after flushing the optical path sections (19), a portion (8) of the light (1) of the light source (2) is transmitted along a second optical path (26) to a compensation detector (27), the second optical path (26) is flushed with the collected purge gas (22) and the trace gas component in the measuring gas (11) is determined based on a difference between the output (28) of the measuring detector (20) and the output (29) of the compensation detector (27). |
