Abstract
An atmospheric gas monitor with a PbSnTe diode laser has been developed. The open, 1 m optical path in a single-folded configuration enables local and non-contact measurement in a portable instrument. The accuracy is dependent on optical noise and a technique in diode-current modulation was effective in suppressing it. Analysis of the system noise based on the experimental data was made and a 10 ms interval was sufficient to attain an accuracy of 3 ppm for methane. Field measurements were made and a rapid fluctuation in the density of atmospheric methane density was recorded.
| Original language | English |
|---|---|
| Pages (from-to) | 139-144 |
| Number of pages | 6 |
| Journal | Optics and Laser Technology |
| Volume | 17 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - Jun 1985 |
| Externally published | Yes |
Keywords
- gas concentration measurement
- methane
- optical equipment
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering
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