Asymmetric coarse taper structure few-mode fiber strain sensor

Abstract

The invention discloses an asymmetric coarse taper structure few-mode fiber strain sensor. The asymmetric coarse taper structure few-mode fiber strain sensor comprises a broadband light source, a sensing unit and a spectrograph, wherein the sensing unit comprises an incidence single-mode optical fiber, a few-mode optical fiber and an outgoing single-mode optical fiber, one end of the incidence single-mode optical fiber is connected with a light source by virtue of a lead-in single-mode optical fiber, the other end of the incidence single-mode optical fiber is connected with one end lumber spine of the few-mode optical fiber in an amplification and fusing manner, the other end of the few-mode optical fiber is connected with a lumber spine of the outgoing single-mode optical fiber in an amplification and fusing manner, and the other end of the outgoing single-mode optical fiber is connected with a spectrograph. The asymmetric coarse taper structure few-mode fiber strain sensor is compact in structure, simple in preparation, capable of measuring transverse tensile and longitudinal curvature, accurate in measurement result, high in sensitivity and wide in application potential in various strain measurement fields.

Description

technical field [0001] The invention relates to the field of optical fiber technology, in particular to an optical fiber strain sensor. Background technique [0002] Compared with other sensors, fiber optic sensors have the characteristics of small size, light weight, high sensitivity, no electromagnetic interference, and corrosion resistance, which makes fiber optic sensors have a wide range of applications, almost involving national defense and all fields of national economy and people's daily life. [0003] Strain refers to the change in volume or shape of an object due to external causes or internal defects. In the fields of industry, materials, aviation, etc., the accurate detection of strain plays a pivotal role. At present, the more common optical fiber strain sensors mainly include cascade type, fiber grating type, Sagnac interference type and so on. For example, Tong Zhengrong et al. proposed a sensor based on a multimode-single mode-multimode (Multimode-single mo...

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Problems solved by technology

The above literatures have carried out in-depth and meaningful research on the strain response characteristics of the sensor, but the measurement sensitivity is generally not high, and most of them can only measure the strain from the lateral or longitudinal direction, which cannot fully reflect the force applied to the sensor. Happening

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