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Proceedings Paper

An ammonia sensor with high sensitivity in farmland based on laser absorption spectroscopy technology
Author(s): Ying He; Yujun Zhang; Liming Wang; Kun You; Yanwei Gao; Anning Zhu; Wenliang Yang
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Paper Abstract

High nitrogen fertilizer input is the main manner to maintain the high-yield crops in farmland in China. The average application quantity of nitrogen fertilizer in China is significantly higher than some developed countries in the world. However, the nitrogen fertilizer utilization efficiency is very low. Thus, high sensitivity sensing and on-line monitoring ammonia concentration were needed to quickly acquire the soil nutrient information and to get the nitrogen fertilizer utilization efficiency. A high sensitivity ammonia concentration sensor used in farmland has been developed based on Tunable Diode Laser Absorption Spectroscopy (TDLAS) technology, high frequency modulation technique and long optical path technique. TDLAS is a method to obtain the spectroscopy of gas molecule single absorption line in the characteristic absorption spectrum region as the characteristic of the distributed feed back (DFB) laser with narrow line width and tunability. A sensor array formed with three ammonia concentration sensors by distributed sensing technique was used for ammonia volatilization experiment in a wide range of farmland. It was verified that the performance consistency of the three ammonia sensors was good and the sensor array realized the regional ammonia concentration monitoring. Continuous measurement results showed that the ammonia concentration influenced by the volatile source location, wind direction, weather and other factors, and it was positively correlated with the ammonia volatilization rate. The ammonia sensor array is suitable for continuously ammonia volatilization monitoring in a wide range of farmland environment with its high sensitivity, rapid response time without gas sampling.

Paper Details

Date Published: 30 November 2012
PDF: 7 pages
Proc. SPIE 8561, Advanced Sensor Systems and Applications V, 85610X (30 November 2012); doi: 10.1117/12.999420
Show Author Affiliations
Ying He, Anhui Institute of Optics and Fine Mechanics (China)
Yujun Zhang, Anhui Institute of Optics and Fine Mechanics (China)
Liming Wang, Anhui Institute of Optics and Fine Mechanics (China)
Kun You, Anhui Institute of Optics and Fine Mechanics (China)
Yanwei Gao, Anhui Institute of Optics and Fine Mechanics (China)
Anning Zhu, Institute of Soil Science (China)
Wenliang Yang, Institute of Soil Science (China)

Published in SPIE Proceedings Vol. 8561:
Advanced Sensor Systems and Applications V
Brian Culshaw; Yanbiao Liao; Anbo Wang; Xiaoyi Bao; Xudong Fan, Editor(s)

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