High-sensitivity fiber Bragg grating strain sensor

A technology of strain sensor and optical fiber grating, which is applied in the direction of instruments, optical devices, measuring devices, etc., can solve the problem of low sensitivity of strain measurement and achieve the effect of improving sensitivity

Inactive Publication Date: 2013-11-06
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is to provide a high-sensitivity fiber grating strain sensor, which can overcome the shortcoming of low strain measurement sensitivity

Method used

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  • High-sensitivity fiber Bragg grating strain sensor
  • High-sensitivity fiber Bragg grating strain sensor
  • High-sensitivity fiber Bragg grating strain sensor

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] Such as figure 1 with figure 2 As shown, the manufacturing process of the high-sensitivity optical fiber strain sensor is as follows: the fiber grating (1) terminated with the pigtail is passed through the round holes (9) at both ends of the metal sheet structure (4), and the fiber grating (1) terminated with the pigtail is flattened. Lay it in the center of the metal sheet structure (4) and in the semicircular thin groove (8), so as to ensure that the optical fiber grating (1) to which the pigtail is terminated is in the center of the metal sheet structure (4). Point the adhesive (7) at one end of the optical fiber grating (1) that is terminated with the pigtail and outside the return hole on the side of the metal sheet structure. After the adhesive (7) is cured, the optical fiber grating (1) that is terminated with the pigtail ) is fixed, and a certain pres...

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Abstract

The invention discloses a high-sensitivity fiber Bragg grating strain sensor. The two ends of a tail fiber terminating fiber Bragg grating are fixed in a metal sheet structure central zone through binder. The two ends of the tail fiber terminating fiber Bragg grating are connected with a loose tube and armored cables in a sleeved mode at the same time. The armored cables penetrate through vertical circular holes in the two ends of a metal sheet structure. Meanwhile, two pressing blocks are connected with the metal sheet structure through screws, and the cables penetrating in the metal sheet structure are clamped. During mounting, the two pressing blocks and an object to be detected are bound or fixed in a clamping mode. The distance between the pressing blocks is longer than that between binder at the two ends of the fiber Bragg grating, so that strain measuring sensitivity is improved. By detecting the variation quantity of fiber Bragg grating reflected light wave length, the strain capacity of the object to be detected is determined. The high-sensitivity fiber Bragg grating strain sensor has the advantages of being high in sensitivity, high in detecting accuracy and high in reliability, anti-electromagnetic-interference performance and anti-thunderstrike performance are achieved, networking is easy, and the sensor is especially suitable for strain monitoring of a large structure.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a high-sensitivity optical fiber grating strain sensor for strain measurement of large structures. Background technique [0002] Fiber Bragg gratings are very sensitive to strain, and are easy to manufacture and low in cost, and are conducive to mass production. They have been widely used in the field of sensing, especially for quasi-distribution measurement of parameters such as strain, temperature, pressure, ultrasonic waves, acceleration, and strong magnetic fields. The measurement of strain parameters is one of the most widely used applications, and it is widely used in building structures, tunnels, subways, electric power, oil wells and other fields. The main advantages of fiber grating sensors are free from electromagnetic interference, high sensitivity, large dynamic range, small signal transmission loss, passive transmission, less wiring, and lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
Inventor 龚元袁子琳吴宇饶云江
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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