An automatic monitoring system for cracks in concrete structures
A concrete structure and automatic monitoring technology, which is applied in the direction of measuring devices, optical testing flaws/defects, instruments, etc., can solve the problems of unfavorable long-term and accurate monitoring, poor overall monitoring ability of the structure, and high cost of reflectometers, so as to achieve quantitative monitoring of cracks Effect, strong anti-corrosion and anti-electromagnetic interference ability, small size effect
Active Publication Date: 2021-11-30
HOHAI UNIV
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Problems solved by technology
However, most of the current optical fiber crack monitoring is costly, mostly single-point monitoring, and the overall monitoring ability of the structure is poor, which cannot well meet the needs of the project.
[0003] In the prior art, the optical time domain reflectometer used for optical fiber monitoring is expensive, and it will be overheated or even damaged if it is used continuously for a long time, which affects the monitoring effect and is not conducive to long-term and accurate monitoring
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[0030] Such as figure 2As shown, a concrete structure crack automatic monitoring system of the present invention is used for concrete arch dam crack monitoring. The monitoring optical fiber adopts the SH2001-J plastic optical fiber of Mitsubishi Company, the stable light source adopts the MG-921A stable light source of Japan Anritsu Company, the optical power acquisition unit adopts the JW3233 optical power meter, and the optical time domain reflection module adopts the OTDR-2100POF-650-4 type Optical Time Domain Reflectometer. The finite element analysis model is established according to the structural characteristics and geological conditions of the arch dam, and the potential cracking area of the arch dam is judged through the structural analysis of the arch dam. The plastic optical fiber is arranged in parallel on the downstream surface of the arch dam. The plastic optical fiber is laid in the upper potential cracking area obtained from the above-mentioned finite elem...
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The invention discloses an automatic monitoring system for cracks in concrete structures, comprising: a stable light source, multiple monitoring optical fibers, multiple wavelength division multiplexers, multiple optical switches, an optical power acquisition unit, an optical power analysis unit, and an optical time domain reflection module and central processing unit; the first end of each monitoring fiber is connected to the stable light source, and the end is connected to the first port of the corresponding wavelength division multiplexer; the second port of each wavelength division multiplexer is sequentially Connect the optical power acquisition unit and the optical power analysis unit; the third port of each wavelength division multiplexer is connected to the optical switch; the optical switch is connected to the optical time domain reflection module; the The central processing unit is respectively connected with the optical power analysis unit, the optical switch and the optical time domain reflection module. The invention can realize real-time on-line and continuous monitoring, and can monitor the overall situation of structural cracks, and can achieve good crack quantitative monitoring effect only by configuring an optical time domain reflectometer.
Description
technical field [0001] The invention relates to the fields of structure safety monitoring and health diagnosis in civil engineering and water conservancy industries, in particular to an automatic monitoring system for cracks in concrete structures. Background technique [0002] Cracking is common in the construction and use of concrete structures. When it develops to a certain extent, it will reduce the performance of concrete and destroy the integrity and safety of the structure. Therefore, dynamic and long-term monitoring of cracks is of great significance to ensure the safety of structures. The existing crack monitoring technology is mainly based on point-type electrical sensors, such as inductive and capacitive crack sensors. It has low precision and poor real-time performance. It can only observe a few measuring points, and is easily disturbed by environmental factors such as electromagnetic fields. The information is relatively limited, and it is difficult to adapt to...
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IPC IPC(8): G01N21/88G01B11/00
CPCG01B11/00G01N21/88
Inventor 李涧鸣包腾飞高瑾瑾刘甲奇曹恩华朱征朱茜李慧
Owner HOHAI UNIV