Abstract
In essence, photoacoustic spectroscopy (PAS) technology is based on the thermal effect of gas infrared absorption and the acoustic theory of photoacoustic (PA) cell. PAS technology has a good application effect on environmental monitoring in agriculture. In this study, carbon monoxide and sulfur dioxide were used as examples to explain the potential application of PAS technology and analyze the influence mechanism of pressure and noise on the PA signal. The relationship between PA signal amplitude and the concentration of gas was determined by calibration. The pressure and noise characteristics were experimentally studied, and the relationship between the PA signal and pressure & noise was obtained. The theoretical analysis and experimental results not only provided a basis for further correction of the influence of pressure, noise and other factors on PA signal but also provided technical support for improving the field application of trace gas non-resonance PA detection device for environmental monitoring in agriculture. Keywords: photoacoustic spectroscopy, environmental monitoring in agriculture, trace gas, pressure, noise DOI: 10.25165/j.ijabe.20201305.5749 Citation: Zhu Z Z, Luo J, Liu J X, Fang Y H. Effects of pressure and noise on the stability of photoacoustic signals of trace gas components. Int J Agric & Biol Eng, 2020; 13(5): 187–193.
Highlights
Trace gases in livestock and poultry houses are harmful to animal health and one of the sources of air pollutants
In this study,carbon monoxide and sulfur dioxide were used as examples to explain the potential application of photoacoustic spectroscopy (PAS) technology and analyze the influence mechanism of pressure and noise on the PA signal
N is the total number of molecules per unit volume, molec/cm3; σ is the absorption cross-section of gas, cm2/molec; the product of which is the absorption coefficient α, cm-1. It can be seen from Equation (2) that the PA signal of gas has a linear relationship with the gas concentration when other parameters remain unchanged
Summary
Trace gases in livestock and poultry houses are harmful to animal health and one of the sources of air pollutants. As a new method of spectral detection, PAS has the advantages of high sensitivity, good stability, no consumption of carrier gas, small volume, easy to carry and on-line monitoring. At present, it has become a hot spot in the field of trace gas detection and has a good application prospect[1,2,3,4,5,6,7]. It is necessary to analyze the influence mechanism of pressure and noise on PA signal through theoretical analysis and experimental study, which provides technical support for the field application of non-resonant PA detection devices for environmental monitoring in agriculture. In this study,carbon monoxide and sulfur dioxide were used as examples to explain the potential application of PAS technology and analyze the influence mechanism of pressure and noise on the PA signal
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