Time division multiplexing optical fiber grating sensing network with high renewability

Abstract

The invention discloses a time division multiplexing optical fiber grating sensing network with high renewability. The network mainly comprises a control center, an optical switch, an access selection and delay node and weak reflection optical fiber grating sensing sub-networks. The control center is connected with the sensing sub-networks through the optical switch, sensing signals of the sensing sub-networks are demodulated through switching of different time frames, and the sensing sub-networks can automatically choose accesses through the access selection and delay node. By means of the access selection and delay node, branches of the sensing sub-networks are mutually standby paths, by means of changes of detection signals, a computer can directly control the standby paths to be started, artificial interference is not needed and the automation degree is high. The sensing network is in parallel connection with a plurality of sensing sublayers and accordingly is easy to extend, addressing of sensors on each sublayer is carried out in a time division mode, the limit that light source frequency spectrum resources are insufficient is broken through, and the requirement for building an optical fiber grating sensing system which is large in capacity and high in renewability and reliability is met.

Description

technical field [0001] The invention belongs to the field of sensor technology, and in particular relates to a highly reproducible time-division multiplexing optical fiber grating sensor network. Background technique [0002] With the continuous development of society, the rapid growth of industries such as electric power, petrochemical industry, nuclear industry, and infrastructure construction has made safe production a worldwide issue. Therefore, the realization of temperature, strain, displacement, etc. in modern industrial production and environmental monitoring Accurate measurement of important parameters is of great significance. Fiber Bragg grating sensors have the advantages of light weight, anti-electromagnetic interference, and corrosion resistance. Using wavelength as the sensor signal code can form an optical fiber sensor network. The sensor has high precision and is easy to integrate. The harsh monitoring environment puts forward higher requirements for FBG se...

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Problems solved by technology

However, if the backup path is also damaged, the structure will not work properly; and the wavelength division multiplexing method leads to a very limited number of gratings in series for each subnet, and increasing the number of subnets through the optical switch array increases the system complexity. scan cycle

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