Fiber strain sensitive structure and manufacturing method thereof

Abstract

The invention discloses a fiber strain sensitive structure and a manufacturing method thereof. The fiber strain sensitive structure comprises a left fiber fixing seat, a spring and a right fiber fixed seat which are in fixed connection in sequence, wherein the left fiber fixed seat is provided with a first through hole of which the left and right ends are communicated; the right fiber fixed seat is provided with a second through hole of which the left and right ends are communicated; and after penetrating through the first through hole of the left fiber fixed seat, the spring and the second through hole of the right fiber fixed seat, the fiber is stretched and fixed to the left and right fiber fixed seats; and a fiber strain sensitive unit on the fiber is positioned in the spring. The fiber strain sensitive structure has the characteristics of bidirectional stress strain, wide elastic range, favorable linearity, fatigue resistance, simple manufacturing method and low cost.

Description

technical field [0001] The invention relates to the field of optical fiber sensors, in particular to an optical fiber strain sensitive structure and a manufacturing method thereof. Background technique [0002] Optical fiber sensing technology is more and more widely used in various industrial and military fields due to its advantages of no electricity, intrinsic immunity from electromagnetic interference, long-distance detection and resistance to harsh environments. With the development of optical fiber sensing technology, various optical fiber strain sensors that play an important role in this technical field continue to appear, but their strain-sensitive structures mainly include the following types: [0003] One) sheet structure, such as metal sheet, film, composite sheet, etc., the patents with publication numbers CN2550719Y, CN2706738Y, and CN2627460Y disclose this structure. This kind of structure is simple and easy to implement, but the elastic range is small, the l...

AI Technical Summary

Problems solved by technology

This structure is linear, but the elastic range is still limited by the capillary material

In addition, the Chinese invention patent with the publication number CN1316227C proposes a displacement sensor composed of a fiber grating capillary strain sensor connected in series with a spring. If the structure is used as a strain sensor, although the elastic range increases, it is still limited by the capillary structure. and the non-linear error caused by the series

The third structure, such as the U.S. patent with publication number US6047094, uses a composite material to wrap the optical fiber sensitive unit, and the elastic range is greatly improved, but the linearity is poor

This type of structure has improved in terms of elastic range and linearity, but has the problem of being prone to fatigue

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