Lattice beam deformation optical fiber real-time sensing and monitoring system
A technology for monitoring systems and lattice beams, which is applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems of sensing optical fiber measurement accuracy drop, frequency-sweeping laser nonlinearity, sensing signal interference, etc., and achieve a wide range of applications and operability, improve the signal strength, improve the effect of the signal-to-noise ratio
Active Publication Date: 2021-10-29
TAIYUAN UNIV OF TECH
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Problems solved by technology
The optical frequency domain reflection technology in the distributed optical fiber sensing technology has the characteristics of high spatial resolution, high real-time performance, and high precision, but it is limited by the performance of the frequency-sweeping laser source, and there is a problem of nonlinearity of the frequency-sweeping laser. The sensing signal causes great interference, resulting in a low signal-to-noise ratio. In practical applications, the unreasonable laying of the sensing fiber will also cause a decrease in measurement accuracy.
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[0028] like Figure 1 to Figure 5 As shown, a real-time sensing and monitoring system for lattice beam deformation optical fiber in the present invention includes a linear frequency-sweeping light source output module 35, a dual main interference optical circuit sensing module 34, an auxiliary interference nonlinear phase acquisition module 36, and a data acquisition and processing module 37. The dual main interference optical circuit sensing module 34 is used to realize the simultaneous perception and data transmission of the longitudinal and transverse strain distribution information of the lattice beam;
[0029] The output terminal T of the linear frequency sweeping light source output module 35 is connected to the input terminal of the dual main interference optical circuit sensing module 34 through an optical fiber, and the output terminal V of the linear frequency sweeping light source output module 35 is connected to the auxiliary interference nonlinear phase The input ...
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The invention discloses a lattice beam deformation optical fiber real-time sensing and monitoring system, which belongs to the technical field of distributed optical fiber sensing and aims to solve the problems that the existing lattice beam deformation monitoring scheme cannot accurately detect the deformation of a lattice beam body in real time, cannot evaluate the slope state in real time, and cannot effectively monitor a large-range slope. A double-main interference optical loop, a light polarization state control technology and a light intensity amplification technology are adopted, and a nonlinear phase of frequency sweeping laser is compensated by using dechirping filtering, so that real-time and accurate lattice beam network monitoring is realized; meanwhile, the invention provides a specific method for laying the sensing optical fibers in the lattice beam body and the lattice beam network, real-time and accurate monitoring of the slope lattice beam network is realized, and the method has the advantages of high real-time performance, accurate measurement, all-weather monitoring and the like.
Description
technical field [0001] The invention discloses a lattice beam deformation optical fiber real-time sensing and monitoring system, which belongs to the technical field of distributed optical fiber sensing real-time monitoring systems. Background technique [0002] Slope protection and reinforcement has always been an important issue in landslide control and road maintenance in my country. As an effective measure for landslide control, lattice beams have been widely used. The problem of lattice beam deformation monitoring has always been the focus of research at home and abroad, but the existing lattice beam deformation monitoring schemes have large measurement errors in the monitoring system, insufficient real-time measurement, complex and unstable system structure, difficult maintenance and detection, and high cost. High-level problems have brought great difficulties to the slope protection work. The real-time optical fiber sensing monitoring system for lattice beam deformat...
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Login to View More IPC IPC(8): G01B11/16G01B9/02
CPCG01B11/161G01B9/02015
Inventor 白清张昆梁昌硕靳宝全高妍张红娟王宇刘昕
Owner TAIYUAN UNIV OF TECH