Wide range fiber grating strain transducer

A technology of strain sensor and optical fiber grating, which is applied in the field of sensing, can solve the problems of strain sensor damage, increase cost, yield, etc., and achieve the effect of reducing strain and improving the range

Active Publication Date: 2009-11-04
NAVAL UNIV OF ENG PLA
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Problems solved by technology

However, there are defects in the measurement of large-scale strain (such as ±2500με), mainly reflected in: the strain is transmitted to the fiber grating through the substrate material used in the above packaging method, and the current yield point of ordinary steel σ s limited (about 200MPa), so the strain that can be measured is also limited (ab

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  • Wide range fiber grating strain transducer

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Embodiment Construction

[0013] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings, but they do not constitute a limitation to the present invention, and are only examples. At the same time, the advantages of the present invention will become clearer and easier to understand.

[0014] Referring to Fig. 1 as can be seen: the present invention is a kind of large-range fiber grating strain sensor, and it comprises a sheet metal type plate spring 1, is positioned at the fiber grating 2 in the fine groove 11 on the longitudinal axis of plate spring 1, the two ends of fiber grating 2 Fixed on the corresponding position of flat spring 1.

[0015] Flat spring 1 comprises flat plate structure 12 positioned at the middle, annular planar spring 13 positioned at flat plate structure 12 two ends, and fixed section 14 positioned at flat spring 1 two ends, described flat structure 12, annular planar spring 13 (can adopt a Spring, also can adop...

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Abstract

The invention provides a wide range fiber grating strain transducer. The transducer comprises a foil planar spring (1), wherein a fiber grating (2) is positioned in a groove (11) on the longitudinal axis of the planar spring (1); and two ends of the fiber grating (2) are fixed on corresponding positions of the planar spring (1). The wide range fiber grating strain transducer overcomes the defects of plastic deformation, yielding and even cracking easily happened to the prior strain transducer. The strain transducer of the invention can measure wide range strain (+/-2,500 mu epsilon) through adopting the structure of the planar spring; and through conversion effect of the structure, the strain directly acting on a base material can be effectively reduced, thereby improving the range of measurable strain of the transducer.

Description

technical field [0001] The invention belongs to the field of sensor technology, more specifically it is a large-scale optical fiber grating strain sensor. Background technique [0002] Fiber Bragg Grating is an optical passive device that has developed extremely rapidly in the fields of optical fiber communication and optical fiber sensing in recent years. The strain sensor developed based on fiber grating has the advantages of high sensitivity, small size, corrosion resistance, and electromagnetic radiation resistance, and can meet the measurement needs in harsh working environments such as civil engineering, aerospace, and petroleum industries. Since its sensing signal is directly modulated at the wavelength of light, it is not affected by fluctuations in light intensity, connection loss, and fiber bending loss. It has good stability and high measurement accuracy; in addition, it has the characteristics of wavelength division multiplexing, so multiple Fiber Bragg gratings...

Claims

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Application Information

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IPC IPC(8): G01B11/16
Inventor 黄俊斌谭波顾宏灿李日忠
Owner NAVAL UNIV OF ENG PLA
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