| Autor: |
Sherstov, I.V., Kolker, D.B. |
| Zdroj: |
Quantum Electronics; November 2020, Vol. 50 Issue: 11 p1063-1067, 5p |
| Abstrakt: |
We demonstrate a bench-scale prototype of a photoacoustic (PA) methane gas analyser that takes advantage of an optical parametric oscillator (OPO) based on a fan-out MgO : PPLN structure and resonant differential PA detector. The OPO emits in a repetitively pulsed mode (?1750 Hz) at an idler wavelength of ?3.3 ?m with an average power of ?40 - 50 mW. Using the prototype laser PA gas analyser, we experimentally demonstrate the feasibility of measuring the background methane concentration in air (?2 - 3 ppm of CH4). The threshold sensitivity of the PA gas analyser (1?) is determined to be ? 49 ppb of CH4. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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