Trace nitrous oxide gas detection device

Abstract

The invention relates to the technical field of low-concentration gas detection and in particular relates to a trace nitrous oxide gas detection device. The device comprises an infrared laser output module, an N2O absorption gas chamber and a signal processing module, wherein the central wavelength of laser output by the infrared laser output module is matched with the position of an N2O gas absorption peak; the N2O absorption gas chamber comprises a hollow microstructure fiber; micro pores are formed in the peripheral wall of the hollow microstructure fiber along the radial direction; the laser output by the infrared laser output module is transmitted to one end of the hollow microstructure fiber by virtue of a single mode fiber; laser subjected to N2O gas absorption in the hollow microstructure fiber is output to the signal processing module from the other end of the hollow microstructure fiber by virtue of a multimode fiber; and the N2O gas content is calculated by the signal processing module according to the laser loss. The problem that the light path is short is fundamentally solved when the gas concentration is detected by a tunable laser spectral absorption method; and moreover, the transmission loss is avoided, and the accuracy and reliability of the measurement result are improved.

Description

technical field [0001] The invention relates to the technical field of low-concentration gas detection, in particular to a trace nitrous oxide gas detection device. Background technique [0002] Nitrous oxide (N 2 O) is one of the major greenhouse gases, with about one-third of the N in the atmosphere 2 O comes from human activities, while N emitted from agriculture 2 O accounts for approximately 2 52% of the total O. Research shows that agricultural N 2 O emissions are produced by the nitrification-denitrification of nitrogen fertilizers (mainly nitrate fertilizers) in the soil, and the unreasonable application of nitrogen fertilizers will directly lead to agricultural N 2 O Excessive emissions. Therefore, accurate monitoring of N in the farmland environment 2 O concentration can provide basic scientific data and theoretical reference for rational fertilization in agriculture and formulation of environmental protection policies. [0003] Currently used for low conce...

AI Technical Summary

Problems solved by technology

Compared with the single-path gas cell, although the multi-path gas cell is smaller in size and has a longer effective absorption distance, its structure is more complicated, it is difficult to manufacture and debug, and its stability is poor.

In addition, due to the multiple reflections of light in the gas chamber, it will cause a large transmission loss

Unable to meet trace N in farmland 2 The demand for long-term stable monitoring of O gas

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