Optical fiber macrobend coupling structure and processing method based on ultraviolet curing adhesive

Abstract

The invention discloses a fiber macro bending coupling structure based on UV curing adhesive and a processing method thereof. An active fiber and a passive fiber are twisted at fixed step, and a hightemperature lead is further utilized to wind outside the twisted fiber at a pitch smaller than 5mm; first and tail ends of the twisted fiber and the high temperature lead are coated with silica gel, after solidification, slits of the active fiber and the passive fiber are injected with UV optical cement, solidification under ultraviolet lamp irradiation is realized, and an integrated macro bendingstructure is formed; the integrated structure is bent or wound to form a fiber macro bending coupling structure. The method is advantaged in that through utilizing the UV optical cement, coupling energy is enhanced, coupling optical power of macrobend dark field is enhanced, signal intensity is improved, so power of a light source can be properly reduced, and system power is further reduced alongwith the power of the light source. The processing method is advantaged in that consistency and robustness of a sensor are improved.

Description

technical field [0001] The invention relates to the field of sensing technology, in particular to an optical fiber macrobending coupling structure based on ultraviolet curing glue and a processing method thereof, which are suitable for sensing applications such as chemical liquid, liquid level, gas, displacement and stress. Background technique [0002] In 2014, the team of Liu Wenyi from North University of China published an article "Polymer optical fiber twisted macro-bend coupling system for liquid level detection" in the internationally renowned optical journal "Optics Express", proposing a new sensing structure based on POF fiber - fiber macrobend Coupling structure (macro-bendcoupling structure, referred to as MBCS). The POF fiber macrobend coupling structure is to closely attach two common plastic optical fibers for communication, and form a macrobend structure by bending, spiral winding, etc.; one of the optical fibers is called an active fiber because it is connect...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of poor stability and robustness of the sensor based on the optical fiber macrobend coupling structure, low macrobend dark field coupling power, high system power consumption, reduced signal-to-noise ratio and small sensor range, the present invention provides an improved Optical fiber macrobend coupling structure and processing method based on UV curing adhesive

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