Online concentration monitoring system for gases in cable tunnel based on optical fiber sensing

Abstract

The invention relates to an online concentration monitoring system for gases in a cable tunnel based on optical fiber sensing. The system comprise a tunable laser, a circulator, 1*N photoswitches, an optical cable, sensor probes, a photoelectric detector, and a control module. An output end of the tunable laser is connected with an input end of the circulator. An output end of the circulator is connected with an input end of each of the 1*N photoswitches. Each of the 1*N photoswitches is connected with one sensor probe through a single-core single-mode optical fiber. Another output end of the circulator is connected with an input end of the photoelectric detector, and an output end of the photoelectric detector is connected with a corresponding input end of the control module. Two output ends of the control module are connected with the tunable laser and the corresponding input end of the 1*N photoswitches. The system has the advantages that the passive sensor probes are adaptive to multiple gases, potential safety hazards caused by power supply equipment are avoided, the probes are distributed along the cable, the coverage is wide, calibration can be performed in a machine room, and the troubles of field calibration are omitted.

Description

technical field [0001] The invention relates to a gas concentration monitoring system based on optical fiber sensing technology, which is especially suitable for on-line monitoring of various gas concentrations in cable tunnels. Background technique With the progress of our country's society and economic development, the process of urbanization continues to accelerate, so it is inevitable to continuously put forward higher requirements for the construction of various public infrastructures that cities rely on for their existence and normal operation. As far as the urban power grid is an important part of modern urban public infrastructure, the use of cable tunnels is an important part of meeting the high load density and cable-based power supply requirements in central urban areas, effectively ensuring the transmission capacity of power channels and improving the utilization of channel resources. At the same time, the tunneling of the urban power grid and the networking of...

AI Technical Summary

Problems solved by technology

Increased difficulty and complexity of system operations

4. The above-mentioned sensors are arranged on site, and system calibration and probe replacement must be carried out on site, which increases the difficulty and cost of maintenance

The above technologies are all limited to the monitoring of a certain gas, and cannot be applied to multiple gas applications in cable tunnels

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