Fiber bragg grating soil mass strain sensor for soil mass encapsulation
A strain sensor and fiber grating technology, which is applied in the field of fiber grating soil strain sensors packaged in soil, can solve the problem that the packaging structure and the soil to be tested cannot be deformed together, and the sensors for soil compression deformation testing are rarely involved and the monitoring accuracy is low. Inaccurate and other problems, to achieve the effect of being suitable for industrial production, good precision, and high measurement accuracy
Inactive Publication Date: 2012-04-25
DALIAN UNIV OF TECH
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Problems solved by technology
[0003] Embedded fiber grating sensor is a new type of strain sensor based on fiber grating technology, which is widely used in the field of engineering monitoring, but the sensor for soil compression deformation test is rarely involved
The sensors used for soil monitoring that have been reported so far all use materials with high elastic modulus for elastic packaging of the sensor. The soil to be tested cannot be deformed together, resulting in inaccurate monitoring accuracy
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[0014] Specific embodiments of the present invention will be described in detail below in conjunction with technical solutions and accompanying drawings.
[0015] Fiber Bragg grating soil strain sensor structure, the structure is as follows figure 1 , figure 2 , image 3 and Figure 4 As shown, the sensor includes a pure fiber grating 1, a spring fiber grating 2, a temperature sensor 3, two connecting pipes 4, a temperature sensing tank 5, an armored optical cable 6, and a prefabricated compacted soil encapsulation structure 7. Rigid packaging sheet8. First of all, the soil encapsulation structure is made, and two connecting pipes are pre-placed in the prefabricated cylindrical mold. In order to ensure that the connecting pipes are still in a straight line when the soil material is introduced, a rigid rod is inserted into the connecting pipe (the rigid rod is placed in the soil encapsulation structure. Pull it out from the connecting pipe after the production is completed...
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The invention provides a fiber bragg grating soil mass strain sensor for soil mass encapsulation. The sensor comprises a spring fiber bragg grating, a pure fiber bragg grating, a cylindrical compact soil mass encapsulation structure, two communicating tubes, a temperature sensing groove, a temperature sensor, an armored cable and a rigid encapsulation plate, wherein the two communicating tubes are symmetrically distributed along the axes of the prefabricated cylindrical compact soil mass encapsulation structure, the spring fiber bragg grating in a tensioning status is placed in one communicating tube, and the pure fiber bragg grating in a tensioning status is placed in the other communicating tube; the two communicating tubes are made of discontinuous rigid encapsulation tubes, and the discontinuous part is connected by adopting a high durability hose; two ends of the spring fiber bragg grating and two ends of the pure fiber bragg grating are solidified with two ends of respective communicating tube respectively; the temperature sensor is arranged in the temperature sensing groove, the spring fiber bragg grating, the pure fiber bragg grating and the temperature sensor are led out by connection of the armored cable. The sensor has the advantages of simple process, convenience in layout, high accuracy and large range, can monitor the soil mass compression deformation, and is suitable for industrialization.
Description
technical field [0001] The present invention is a method and sensor for soil package fiber grating strain sensor used for soil strain and compression deformation monitoring. The fiber grating accurately measures the average strain of the soil in a small strain range within the sensing gauge, and then through a fiber grating fixed at both ends that has been pre-tensioned and consolidated with a microspring, the strain of the soil in a large strain range within the sensing gauge is measured. Slightly low-precision monitoring of average strain: use pure fiber gratings and fiber gratings consolidated with microsprings to achieve full-scale strain measurement of soil structures with multi-level monitoring accuracy. The sensor uses soil material to encapsulate the fiber grating to protect the fiber grating. Background technique [0002] Since Morey et al. in the United States first studied the strain and temperature sensors of fiber gratings in 1989, all countries in the world ha...
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IPC IPC(8): G01B11/16
Inventor 赵雪峰钟阳崔砚军欧进萍
Owner DALIAN UNIV OF TECH