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Methane concentration detector and detection method applied in paddy field three-dimensional space

A technology of three-dimensional space and methane concentration, which is applied in the field of photoelectric detection, can solve the problem of inability to monitor the spatial distribution of methane gas concentration in rice fields in a large range in real time, and achieve low cost, online detection, and cost reduction.

Active Publication Date: 2021-03-19
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a methane concentration detector and detection method applied to the three-dimensional space of paddy fields, aiming to solve the problem that in the prior art, the spatial distribution of methane gas concentration in paddy fields cannot be monitored in real-time on-line, low-cost, and in a wide range question

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  • Methane concentration detector and detection method applied in paddy field three-dimensional space
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  • Methane concentration detector and detection method applied in paddy field three-dimensional space

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Embodiment 1

[0027] figure 1 It shows the methane concentration detector applied to the three-dimensional space of paddy fields provided by this embodiment. as attached figure 1 As shown, the methane concentration detector applied to the three-dimensional space of rice fields provided by this embodiment includes a microprocessor 10, a signal generator 20, a laser light source module 30, a segmented detection structure optical fiber module 40, and a signal processing module connected in sequence 50. The segmented detection structure fiber module 4 includes a single-mode fiber 41 and a hollow-core bandgap photonic crystal fiber 42 connected to each other.

[0028] The microprocessor 10 generates a digital signal to control the signal generator 20 to generate two signals, respectively serving as a high-frequency sine wave of the carrier wave and a sawtooth wave signal used to sweep the methane absorption peak to be measured. The two-way signals are driven by the selected laser light source...

Embodiment 2

[0042] attached Figure 4 It is a flow chart of the realization of the methane concentration detection method applied to the three-dimensional space of the paddy field shown in the second embodiment. The method for detecting methane concentration in the three-dimensional space of a paddy field shown in Embodiment 2 is applicable to the detector shown in Embodiment 1. For ease of description, only the parts related to the embodiments of the present invention are shown, and the details are as follows:

[0043] Step S110, the microprocessor outputs a digital signal to the signal generator, and the laser signal output by the laser light source module is controlled by the signal generator;

[0044] Step S120, the laser signal is transmitted to the segmented detection structure fiber module, and an echo signal is generated through the fusion joint between the single-mode fiber and the hollow-core bandgap photonic crystal fiber in the segmented detection structure fiber module ;

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Abstract

The present invention is applicable to the field of photoelectric detection technology, and provides a methane concentration detector applied to the three-dimensional space of paddy fields. The detector includes a microprocessor, a signal generator, a laser light source module, and a segmented detection structure optical fiber connected in sequence module, a signal processing module, and the signal processing module is connected to the microprocessor, and the segmented detection structure optical fiber module includes a single-mode optical fiber and a hollow-core bandgap photonic crystal optical fiber connected to each other. Due to the low cost of the single-mode optical fiber and hollow-core bandgap photonic crystal fiber used in the detector, the cost of the methane concentration detector is greatly reduced, and it can be arranged in a large range in the space to be measured to realize the online monitoring of the spatial distribution of the gas to be measured. detection.

Description

technical field [0001] The invention belongs to the technical field of photoelectric detection, and in particular relates to a methane concentration detector and a detection method applied to the three-dimensional space of a paddy field. Background technique [0002] According to the 5th IPCC report, methane is the second largest greenhouse gas next to carbon dioxide, and its potential for greenhouse effect is 25 times that of carbon dioxide. As one of the main sources of methane emissions, rice fields in my country have emissions as high as rice fields in the world. 27.4% of methane emissions. Therefore, it is of great significance to detect the longitudinal spatial distribution and real-time variation of methane concentration in large-scale paddy fields for the study of methane emissions from paddy fields, methane transport mechanism of rice plants, greenhouse gas emission reduction, and growth status of rice plants. [0003] The process of methane emission and absorption ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/17
CPCG01N21/17
Inventor 王嘉宁王淑荣林冠宇
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI