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Intelligent monitoring method of optical fiber with ice structure

A technology of optical fiber intelligence and ice structure, which is applied in the direction of optical testing for defects/defects, can solve the problems of long-term and reliable monitoring of the force characteristics of hard-ice structures, and achieve the effects of saving extremely layout costs, long transmission distance, and small size

Inactive Publication Date: 2009-05-20
HARBIN INST OF TECH
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  • Description
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AI Technical Summary

Problems solved by technology

Due to the particularity of ice formation conditions (low temperature) and composition (water), traditional monitoring methods (such as electrical measurement, GPS real-time monitoring, etc.) are difficult to monitor the mechanical properties of ice structures reliably for a long time

Method used

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  • Intelligent monitoring method of optical fiber with ice structure
  • Intelligent monitoring method of optical fiber with ice structure
  • Intelligent monitoring method of optical fiber with ice structure

Examples

Experimental program
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Embodiment Construction

[0016] The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0017] Figure 1-Figure 4 Middle: 1-armoured transmission jumper, 2-fiber grating sensor, 3-optical fiber or FRP-OFBG smart rib, 4-object to be tested, 5-fiber grating and Brillouin collinear system, 6-ice structure standard test pieces, 7-ice beam structure.

[0018] combine figure 1 , the collinear sensing probe fiber grating 2 or the FRP-OFBG smart bar 3 is arranged on the structure 4 to be tested, and the position of the fiber grating corresponds to the vulnerable position of the structure, and the fiber grating and Brillouin collinear measurement system 5 pairs The strain of the structure along the position of the sensor probe is monitored on a full scale to realize structural damage location and low-precision quantification, and at the same time, high-precision and accurate quantitative measurement of the vulnerable position of the structure....

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Abstract

The invention provides an optical fiber intelligent monitoring method for ice structures, in particular an intelligent monitoring method and a technique for single or collinear ice structures, which are based on a Brillouin distributed sensing technique and a local high-precision fiber grating technique. The technical method is based on an optical fiber sensing probe, has the advantages of humidity resistance, long sensing distance, good linearity and repeatability in low-temperature environment, full-distribution type absolute measurement and the like. The method comprises the following steps: the optical fiber sensing probe into which a plurality of fiber gratings are written or an encapsulate FRP-OFBG intelligent bar based on fiber-reinforced plastic is arranged in an ice structure, so as to realize large-scale full-distribution local high-precision test on structural damage and provide comprehensive, direct and reliable information for the safety assessment of the ice structure. The method is particularly applicable to the long-term monitoring for the ice structure or structures bearing ice load, and has the advantages of succinct system, low cost, strong operability, good stability and durability, convenient and reliable sensor layout and the like.

Description

(1) Technical field [0001] The invention relates to the field of structural damage monitoring methods and technologies, in particular to an optical fiber intelligent monitoring technology for ice structures. (2) Background technology [0002] As a solid form of water, ice is a phenomenon that exists in nature. With the development and utilization of marine resources in severe cold areas, the construction of hydraulic structures such as bridges and ports, and the construction of various giant ice and snow buildings, in the ever-changing The effect of ice on these structures under the climate and the change of ice's own characteristics are important factors affecting the safety and reliability of these structural facilities. In 1912, the Titanic collided with an iceberg and sank to the bottom of the sea, killing 1,500 people; from 1962 to 1963, two offshore oil platforms in the Gulf of Alaska in the United States were pushed by ice; The role of the Haisijing platform in sea i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/88
Inventor 张磊周智何建平任鹏吴明蒋中国宋晓旭李麒麟
Owner HARBIN INST OF TECH
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