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Zhang S.,Shanghai JiaoTong University | Dong D.,Beijing Academy of Agriculture and Forestry Sciences | Zheng W.,National Research Center for Intelligent Equipment for Agriculture | Wang J.,National Research Center for Intelligent Equipment for Agriculture
Optical Engineering | Year: 2014

Animal facilities produce large amounts of harmful gases such as ammonia, hydrogen sulfide, and methane, many of which have a pungent odor. The harmful gases produced by animal housing not only affect the health of people and livestock but also pollute the air. The detection of the harmful gases can effectively improve efficiency of livestock production and reduce environmental pollution. More and more optical detection methods are applied to the detection of the harmful gases produced by animal housing. This summarizes optical detection methods for monitoring the harmful gases in animal housing recently, including nondispersive infrared gas analyzer, ultraviolet differential optical absorption spectroscopy, Fourier transform infrared spectroscopy, and tunable diode laser absorption spectroscopy. The basic principle and the characteristics of these methods are illustrated and the applications on the detection of harmful gases in animal housing are described. Meanwhile, the research of harmful gases monitoring for livestock production based on these methods were listed. The current situation and future development of the detection methods for harmful gases generated by animal housing were summarized by comparing the advantages and disadvantages of each method. © 2014 Society of Photo-Optical Instrumentation Engineers (SPIE).


Zhang S.,National Research Center for Intelligent Equipment for Agriculture | Shen C.,National Engineering Research Center for Information Technology in Agricultural | Zheng W.,National Research Center for Intelligent Equipment for Agriculture | Xing Z.,National Engineering Research Center for Information Technology in Agricultural
Sensor Letters | Year: 2014

Water-saving irrigation has an important significance for China to achieve sustainable development of agriculture. The calculation of crop evapotranspiration is an important part in the implementation of water-saving irrigation. A calculation and prediction method of relative crop evapotranspiration was proposed based on Penman-Monteith equation in this paper. The Penman-Monteith equation in hourly scale was used in the calculating of relative crop evapotranspiration, which could obtain the over a period of time accurately. ET0 predicting method was presented using weather forecast data based on Penman-Monteith equation in daily scale. Comparative experiments were carried out to verify the accuracy of the method described in the text. In order to verify the accuracy of the calculation of ET, an A-Class evaporation pan was used as a reference. The results of the comparative experiments showed that the calculated results using the equation had high consistency to the measuring results obtained by A-Class evaporation pan. The verification experiment results of forecast data showed that the prediction accuracy of the next one day was high. Copyright © 2014 American Scientific Publishers.

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