Real-time on-line monitoring device for multiple gases of farmland

A monitoring device and gas technology, applied in the direction of color/spectral characteristic measurement, etc., can solve problems such as difficult to achieve real-time online monitoring, long sampling time, etc., achieve the effect of eliminating external interference, improving detection sensitivity, and meeting the needs of farmland work

Active Publication Date: 2015-07-15
ANHUI ZHONGKE INTELLIGENT PERCEPTION BIG DATA IND TECH RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires sampling, and the sampling time is long, so it is difficult to achieve real-time online monitoring

Method used

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  • Real-time on-line monitoring device for multiple gases of farmland
  • Real-time on-line monitoring device for multiple gases of farmland
  • Real-time on-line monitoring device for multiple gases of farmland

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Embodiment Construction

[0026] In order to make it easy to understand the technical means, creation features, achieved goals and effects of the present invention, the present invention will be further described below with reference to the specific figures.

[0027] like Figure 1-4 As shown, a real-time online monitoring device for various gases in farmland, including superluminescent light emitting diode, diode controller, function generator, spectrometer, off-axis quartz tuning fork enhanced photoacoustic cell, power meter, adder, phase lock Amplifier, data acquisition card and notebook computer, characterized in that: the superluminescent diode is connected to the diode controller through a cable, the function generator is connected to the diode controller through an IEEE488 data cable, the The off-axis quartz tuning fork enhanced photoacoustic cell is provided with two quartz tuning forks, and the two quartz tuning forks are respectively connected with the adder through the preamplifier by wires;...

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Abstract

The invention discloses a real-time on-line monitoring device for multiple gases of farmland. The device includes a superluminescent diode, a diode controller, a function generator, a spectrometer, an off-axis quartz tuning fork enhanced photoacoustic cell, a power meter, an adder, a lock-in amplifier, a data acquisition card, and a notebook computer. The modulated light emitted by the superluminescent diode undergoes beam splitting by a beam splitter, then one part of the light enters the spectrometer through lens gathering, and the other part of light enters the off-axis quartz tuning fork enhanced photoacoustic cell through lens gathering. Gases in the photoacoustic cell absorbs energy, and thermal energy is generated by nonradiative transition, so that the gases can expand and shrink, and resonant sound waves generated in a tubular resonant cavity are detected by the quartz tuning forks. The quartz tuning forks convert the detected sound signals into electrical signals. The two electrical signals are respectively amplified by pre-amplifiers, added together by the adder, and then transmitted to the lock-in amplifier to carry out demodulation. The demodulated signals are acquired by the data acquisition card, and after analysis, concentrations of the gas can be obtained.

Description

technical field [0001] The invention relates to a monitoring technology for multiple gases in farmland, in particular to a real-time online monitoring device for multiple gases in farmland based on an off-axis quartz tuning fork enhanced photoacoustic spectroscopy technology. Background technique [0002] With the warming of the global climate, the emission of greenhouse gases such as methane, carbon dioxide, nitrous oxide and chlorofluorocarbons in the atmosphere has caused widespread concern. Farmland is one of the important sources of greenhouse gas emissions. Farmland that has been flooded for a long time can produce methane through fermentation. The organic matter in the soil is decomposed by microorganisms to release carbon dioxide. More than half of the nitrous oxide in the world comes from the nitrification and denitrification of farmland soil. process. Determining the amount of greenhouse gas emissions from farmland and finding ways to reduce it has become an urgen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/25
Inventor 汪六三鲁翠萍庄重汪玉冰陈鹏宋良图王儒敬
Owner ANHUI ZHONGKE INTELLIGENT PERCEPTION BIG DATA IND TECH RES INST CO LTD
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