Carbon fiber packaging fiber bragg grating strain transducer and manufacturing method thereof
A technology of strain sensor and optical fiber grating, which is applied in the direction of transmitting sensing components, instruments, and measuring devices using optical devices, can solve problems such as high cost, complicated process, and unfavorable networking, and achieve high long-term reliability, high hardness, and Good long-term stability
Active Publication Date: 2012-08-01
SHANGHAI BOJOE SENSING TECH
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Problems solved by technology
However, this solution requires processes such as optical fiber metallization and welding of nickel tubes, the process is relatively complicated, and the cost is high
In addition, due to the limitation of the inner diameter of the nickel tube, the fiber gratings installed with the nickel tube are mostly single-ended, which is not conducive to networking and cannot fully utilize the technical advantages of fiber grating wavelength division multiplexing
Method used
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[0021] Attached below figure 1 and image 3 The specific implementation of the present invention is described in detail:
[0022] Fiber Bragg grating strain sensor of the present invention comprises installation bar I 6, protective pipe 7, elastic beam 8, installation bar II 9, armored optical cable 10, loose tube 11, carbon fiber braided cloth 12, fiber grating 13, optical fiber pigtail 14. The elastic beam 8 is composed of a threaded assembly rod I1, a carbon fiber winding rod I2, a staggered and symmetrically slotted structure 3, a carbon fiber winding rod II4, and a threaded assembly rod II5.
[0023] The specific implementation process is as follows:
[0024] Preparation:
[0025] 1) According to the relative position of the carbon fiber winding rod I 2 and the carbon fiber winding rod II 4, the optical fiber coating layer of the optical fiber pigtail 14 at the two ends of the fiber grating 13 is utilized in the prior art (for example: optical fiber stripping pliers ...
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The invention discloses a carbon fiber packaging fiber bragg grating strain transducer which is composed of an elastic beam, a fiber bragg grating, a carbon fiber woven fabric, a protective pipe, a mounting rod I, a mounting rod II, an armored cable, a fiber bragg loose sleeve pipe and the like of a slotting structure with an alternatively symmetrical middle part; fiber pigtails at two ends of the fiber bragg are fixed on the elastic beam by utilizing the carbon fiber woven fabric, and the protective pipe is sleeved on the fiber pigtails; the mounting rod I and the mounting rod II are respectively fixed at two ends of the elastic beam through screw threads; the fiber pigtails are protected by the armored cable and the fiber loose sleeve pipe; when the mounting rod I and the mounting rod II are respectively fixed on an object to be measured, the deformation of the object to be measured enables the mounting rod I and the mounting rod II to generate relative displacement; through the force transmission, and further under the driven of the carbon fiber woven fabric, the fiber bragg grating is stretched and compressed, so that the reflecting wavelength of the fiber bragg grating moves, and the strain information of the object to be measured can be calculated through detecting the amount of movement of the reflecting wavelength of the fiber bragg grating. The transducer has the advantages of high flexibility, high measurement accuracy, good long-term reliability, electromagnetic interference resistance, lightening strike resistance, corrosion resistance, capability of networking, reusability and the like.
Description
Technical field: [0001] The invention relates to the field of civil engineering and the field of optical fiber sensing technology, in particular to an optical fiber grating strain sensor with an elastic beam structure with staggered symmetrical slots in the middle and a preparation method thereof, which is packaged by carbon fiber glue-free packaging technology. Background technique: [0002] Strain is an important index to characterize the safety of engineering structures. People usually evaluate the health of an engineering structure by detecting the strain of the structure. Excessive strain on the structure due to external effects will cause damage such as cracks in the structure, and further development will lead to damage to the structure and even threaten engineering safety. Therefore, it is of great significance to develop various strain sensors for long-term, real-time and dynamic monitoring of the strain of engineering structures. [0003] In the past ten years, wi...
Claims
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IPC IPC(8): G01B11/16G01D5/353
Inventor 赵恩国
Owner SHANGHAI BOJOE SENSING TECH