Ultrahigh strain sensor based on fiber bragg grating

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 that the negative strain measurement range cannot be improved, and can be measured, and achieves the effects of low cost, simple working principle, and easy production

Active Publication Date: 2014-09-03
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the existing fiber grating strain sensor cannot measure the measured target beyond the range of ±3000με, especially the current situation that the negative strain measurement range cannot be improved. sensor

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Embodiment Construction

[0016] The implementation of the present invention will be described in detail below with reference to the drawings and examples.

[0017] as attached figure 1 Shown, a kind of ultra-large strain sensor based on fiber grating provided by the present invention comprises substrate (11) and the optical fiber (9) that has fiber grating (8), and wherein fiber grating (8) selects the grating that grating length is 10mm for use, The base (11) is composed of a connection area (7) from the center to both ends, an inner elastic structure (3) positioned at both ends of the connection area (7), an outer elastic structure (2) and a base fixing area (1), and the connection area (7) ) is directly connected to the inner elastic structure (3) at both ends, and the U-shaped transition section ( 6) Connection, each component is processed by an integrated structure, and its U-shaped transition section (6) can also be arc-shaped or other shapes, as long as it can meet the effect of preventing exc...

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Abstract

The invention relates to an ultrahigh strain sensor based on a fiber bragg grating. Double elastic structures are designed on a substrate (11), the rigidity of the inner side elastic structure is larger than that of the outer side elastic structure, the fiber bragg grating (8) with prestress is fixed between the inner side elastic structure and the outer side elastic structure, and it is ensured that under the strain action, the inner side elastic structure (3) and the outer side elastic structure (2) bear the same drawing force or compressing force. As the inner side elastic structure (3) and the outer side elastic structure (2) are different in rigidity, the stretching length of the inner side elastic structure (3) is smaller than that of the outer side elastic structure (2), namely the strain of the inner side elastic structure (3) is smaller than that of the outer side elastic structure (2), and consequently ultrahigh strain can be measured. Compared with the prior art, the ultrahigh strain sensor based on the fiber bragg grating has the advantages that the process is simple, the structure is stable, measurement is accurate, and the ultrahigh strain (+ / -3000 mu epsilon or above) can be measured.

Description

technical field [0001] The invention relates to an ultra-large strain sensor, in particular to an ultra-large strain sensor based on an optical fiber grating, and belongs to the technical field of optical fiber sensors. Background technique [0002] Fiber Bragg grating sensor is one of the hotspots in the field of fiber optic sensing, and it is widely used in various fields such as aviation, aerospace, chemical medicine, material industry, water conservancy and electric power, shipbuilding, coal mining, and civil engineering. [0003] Optical fiber sensing technology is a new technology developed in the mid-1970s. It is gradually formed along with the development of optical fiber and optical communication technology. Fiber Bragg grating sensor is a wavelength modulation optical sensor developed on the basis of fiber Bragg grating, which includes two functions of detection and transmission of the measured target. It uses optical fiber as the transmission medium. When the en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
Inventor 张毅翔赵印明薛景锋
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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