Abstract
This article describes a gas monitoring system for detecting nitrous oxide (N2O) gas using a compact mid-infrared laser source based on difference-frequency generation in a quasi-phase-matched LiNbO3 waveguide. We obtained a stable output power of 0.62 mW from a 4.6-μm-band continuous-wave laser source operating at room temperature. This laser source enabled us to detect atmospheric N2O gas at a concentration as low as 35 parts per billion. Using this laser source, we constructed a new real-time in-situ monitoring system for detecting N2O gas emitted from potted plants. A few weeks of monitoring with the developed detection system revealed a strong relationship between nitrogen fertilization and N2O emission. This system is promising for the in-situ long-term monitoring of N2O in agricultural production, and it is also applicable to the detection of other greenhouse gases.
Highlights
Nitrous oxide (N2O) is one of the main greenhouse gases (GHGs)
We have developed a N2O monitoring system that automatically measures the concentrations of gases emitted by potted plants
We evaluated the laser source under the conditions described above
Summary
Nitrous oxide (N2O) is one of the main greenhouse gases (GHGs). N2O exhibits a strong greenhouse effect, even though its concentration in the atmosphere (325 parts per billion in volume (ppbv) as measured in 2012) is low compared with carbon dioxide (397 parts per million in volume (ppmv)) or methane (1,830 ppbv) [1]. Gas chromatography has been widely used to measure N2O emissions during agricultural production. For the highly sensitive long-term monitoring of cultivated plants in-situ, it is desirable for the monitoring system to measure gas concentrations automatically at a constant frequency. To develop an automatic monitoring system for laser absorption spectroscopy, gas sampling should be optimized for plants. A 4.6-μm-band CW laser source is suitable for continuous emission monitoring. We obtained a QPM-LN waveguide laser source with a high conversion efficiency for. We have developed a N2O monitoring system that automatically measures the concentrations of gases emitted by potted plants. We report the variations in the concentrations of N2O gases emitted by a cultivated tomato plant
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