Monitoring Method of Compression and Tensile Deformation of Stressed Rods Based on Optical Fiber Sensing Technology

Abstract

The invention discloses a method for monitoring the compression and tensile deformation of stressed rods based on optical fiber sensing technology, which includes the following steps: selecting different sensing Optical cables are installed, that is, quasi-distributed steel stress sensing optical cables or quasi-distributed fiber Bragg grating strain sensing optical cables. The above-mentioned sensing optical cables are connected to the FBG demodulator; the FBG demodulator sends out broadband optical signals and transmits them to the sensing optical cables. And reflect a set of narrow-band light with different wavelengths; when the sensing optical cable changes with the support rod, the resonant wavelength of the sensing optical cable will drift, and the wavelength of the reflected narrow-band light will be identified by the FBG demodulator, and the narrow-band light will be monitored The wavelength change of the beam is used to determine whether the support rod is stretched or compressed. The invention has the advantages that: compared with the traditional point-type monitoring method, quasi-distributed monitoring is realized by using the optical fiber sensing technology, and the convenience, sensitivity and precision of the measurement are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of automatic monitoring, and in particular relates to a method for monitoring compression and tensile deformation of stressed rods based on optical fiber sensing technology. Background technique [0002] In the current foundation pit construction, the collapse caused by the instability of the foundation pit slope may cause major safety risks or accidents in the foundation pit and surrounding building facilities. At present, in the monitoring of the foundation pit construction process, manual on-site measurement is mostly used, and the construction site is monitored through instruments such as full rotation instruments, levels, and reading instruments. This method often takes a lot of time for technicians, resulting in the inability to quickly obtain data. , using manual monitoring, which often has a small monitoring coverage density, cannot meet the requirements of early warning, and cannot guarantee the per...

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Problems solved by technology

[0002]In the current foundation pit construction, the collapse caused by the instability of the foundation pit slope may cause major safety risks or accidents in the foundation pit and surrounding building facilities

At present, in the monitoring of the foundation pit construction process, manual on-site measurement is mostly used, and the construction site is monitored through instruments such as full rotation instruments, levels, and reading instruments. This method often takes a lot of time for technicians, resulting in the inability to quickly obtain data. , using manual monitoring, which often has a small monitoring coverage density, cannot meet the requirements of early warning, and cannot guarantee the personal safety of surveyors

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