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Sensors 2013, 13(8), 9999-10013; doi:10.3390/s130809999
Article

Real-Time N2O Gas Detection System for Agricultural Production Using a 4.6-µm-Band Laser Source Based on a Periodically Poled LiNbO3 Ridge Waveguide

1,* , 1,†
,
1
,
2
,
2
 and
1
1 NTT Photonics Laboratories, Nippon Telegraph and Telephone Corporation, 3-1, Morinosato Wakamiya, Atsugi-shi, Kanagawa Pref. 243-0198, Japan 2 Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko-shi, Chiba Pref. 270-1194, Japan Current address: Department of Electrical and Electronic Engineering, Tokai University, 4-1-1 Kitakaname, Hiratsuka-shi, Kanagawa Pref. 259-1292, Japan
* Author to whom correspondence should be addressed.
Received: 17 June 2013 / Revised: 12 July 2013 / Accepted: 1 August 2013 / Published: 5 August 2013
(This article belongs to the Special Issue Gas Sensors - 2013)
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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.
Keywords: periodically poled LiNbO3 (PPLN); laser source; mid infrared; nitrous oxide (N2O); WMS; gas monitoring; cultivated plant; fertilization periodically poled LiNbO3 (PPLN); laser source; mid infrared; nitrous oxide (N2O); WMS; gas monitoring; cultivated plant; fertilization
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Tokura, A.; Asobe, M.; Enbutsu, K.; Yoshihara, T.; Hashida, S.-N.; Takenouchi, H. Real-Time N2O Gas Detection System for Agricultural Production Using a 4.6-µm-Band Laser Source Based on a Periodically Poled LiNbO3 Ridge Waveguide. Sensors 2013, 13, 9999-10013.

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