We demonstrate advanced experimental approaches to photoacoustic gas detection with tunable mid-infrared (mid-IR) laser sources of different types. A gas analyzer for registration of various gas components based on a tunable narrow-linewidth optical parametric oscillator (OPO) was designed and investigated. Using this OPO, the possibility of measuring the trace concentration (~2÷3 ppm) of methane (CH4) in air was experimentally shown. The gas detection capability was enhanced by introducing injection seeding into the OPO. Another gas analyzer was based on a quantum cascade laser (tunable within the range ~7.6 ÷7.7 μm) and a resonant differential photoacoustic detector. Detection of the ultra-low concentration (~0.3 ppm) of methane in air was achieved (the standard dispersion was (1σ) ≈ (10–11) ppb with an integration time of 10 s). We compare the presented approaches and outline their further development.
|Journal||Journal of Physics: Conference Series|
|Publication status||Published - 9 Nov 2021|
|Event||9th International Symposium on Modern Problems of Laser Physics, MPLP 2021 - Novosibirsk, Russian Federation|
Duration: 22 Aug 2021 → 28 Aug 2021
- 1.03 PHYSICAL SCIENCES AND ASTRONOMY