Single-frequency thulium-doped inner cavity mixed gas component identification and concentration detection optical fiber sensing system

Abstract

The invention discloses a single-frequency thulium-doped inner cavity mixed gas component identification and concentration detection optical fiber sensing system, which is characterized in that 1570 nm laser output by a distributed feedback Bragg semiconductor laser is amplified by an erbium-doped optical fiber amplifier to serve as pump light, the pump light is coupled by a 1570 / 2000 nm wavelength division multiplexer to enter an annular cavity thulium-doped optical fiber laser, a one-way optical fiber isolator is used for ensuring that laser with the wave band of 2000 nm is transmitted back and forth anticlockwise in the annular cavity thulium-doped optical fiber laser, the laser with the wave band of 2000 nm fully interacts with gas to be detected in the laser when passing through a gas chamber every time, and finally, the laser carrying dual information of gas composition and concentration is output from an output coupler. According to the single-frequency thulium-doped inner cavity mixed gas component identification and concentration detection optical fiber sensing system, precise component identification and concentration detection of the gas or even more types of gases are realized, and the detection sensitivity of the system and the measurement of lower gas concentration are improved.

Description

technical field [0001] The invention relates to the field of optical fiber sensing and detection, in particular to a single-frequency thulium-doped inner cavity mixed gas component identification concentration detection optical fiber sensing system. Background technique [0002] Optical fiber gas sensing is widely used in the detection of toxic and harmful gases in environmental governance, chemical production, electric power and other industries due to its advantages of strong anti-electromagnetic interference, high reliability, and easy networking for remote detection. In the smart home, through the gas concentration sensor, the analysis of dangerous gases can be realized, so that targeted control strategies can be adopted, which is also an important link to maintain the safety of family life and eliminate the danger in the non-occurrence period. [0003] The traditional optical fiber gas sensing system focuses on the concentration detection of a single gas, which reduces ...

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Problems solved by technology

[0003] The traditional optical fiber gas sensing system focuses on the concentration detection of a single gas, which reduces the reuse rate of the system; and the traditional optical fiber gas sensing system is mainly concentrated in the 1.5μm band, and the absorption intensity of the gas in this band is relatively small, so the sensitivity room for improvement

For multi-component mixed gas detection, the interval between gas absorption peaks is an important factor affecting its recognition accuracy, while traditional optical fiber gas sensing systems use broadband light sources or MHz light sources, and their spectral width cannot meet the requirements for absorption peaks. The requirement for accurate identification of closely spaced gases seriously restricts the resolution of the system for different gas identification, greatly increasing the error of gas component identification

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