Time division multiplexing optical fiber grating sensing network with high renewability

A high reproducibility, fiber grating technology, applied in the field of sensing, can solve problems such as failure to work normally, limited number of gratings, and increased scanning cycle, etc., to achieve high reproducibility and reliability, high degree of automation, and convenient The effect of post-maintenance

CN103986521AActive Publication Date: 2014-08-13GUILIN UNIV OF ELECTRONIC TECH
6 Cites 7 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2014-08-13

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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...

Examples

Embodiment Construction

[0030] The technical solutions and implementation principles of the present invention will be further described below in conjunction with the accompanying drawings.

[0031] The present invention is a highly reproducible time-division multiplexing fiber grating sensor network, such as figure 1 As shown, it includes a control center 1-1, a 1×N optical switch 1-2 (that is, the main switch), N path selection and delay nodes 1-3 (that is, a remote node) and N weak reflection fiber grating transmission Sensing subnet 1-4 (that is, sensing subnet). The control center 1-1 is connected to N weak reflection fiber Bragg grating sensing subnets 1-4 through 1×N optical switches 1-2, and the weak reflection fiber Bragg grating sensing subnet 1-4 is selected by the path and the delay node 1-3 connected to form a ring structure.

[0032] The role of the control center 1-1 is to provide light sources, demodulate sensing signals, and realize the control of optical switches and programmable o...