CN107200484B

CN107200484B - Optical fiber corrosion device

Info

Publication number: CN107200484B
Application number: CN201710411767.7A
Authority: CN
Inventors: 赵勇; 王淑娜; 吕日清
Original assignee: Northeastern University China
Current assignee: Northeastern University China
Priority date: 2017-06-05
Filing date: 2017-06-05
Publication date: 2020-05-12
Anticipated expiration: 2037-06-05
Also published as: CN107200484A

Abstract

The invention discloses an optical fiber corrosion device, which comprises an organic glass groove, a natural rubber plug, a reducing optical fiber guide pipe, a support frame, a sealing cover and a base, wherein the organic glass groove is fixed on the base, notches at two sides are blocked by the natural rubber plug through epoxy resin adhesive, and the two sides are respectively provided with one support frame fixed on the base; the height of the support frame is the same as that of the organic glass groove, a through hole is formed in the support frame, the through hole is overlapped with the center of a natural rubber plug, and the support frame ensures the stability of the reducing optical fiber guide tube; the diameter-variable optical fiber guide tube is inserted on the natural rubber plug, penetrates through the through hole of the support frame, is inserted into the natural rubber plug, enters the organic glass groove, and is smoothly led in and out of the optical fiber. The optical fiber corrosion device overcomes the problems that the optical fiber can only be corroded from one end in a common optical fiber corrosion device, the safety of an operator is threatened by corrosive liquid, the optical fiber is easy to break after corrosion and the like, and has a simple structure and convenient and safe operation.

Description

Optical fiber corrosion device

Technical Field

The invention belongs to the technical field of optical fiber corrosion, and relates to an optical fiber corrosion device.

Background

The optical wave signal in the optical fiber is susceptible to the influence of parameters such as pressure, temperature, electric field, magnetic field and the like in the external environment, and in the field of optical fiber sensing, people utilize the change of the external factors to cause the corresponding change of the optical properties (intensity, frequency, wavelength, phase and the like) of the optical wave signal in the optical fiber, so that various types of optical fiber sensors are developed. Compared with the traditional various sensors, the optical fiber sensor has the characteristics of optical fiber and optical measurement as follows: (1) the optical fiber has good flexibility, small volume and light weight. According to different detection requirements, a plurality of sensing elements with different forms can be manufactured through a simple process; and can be connected with a computer and an optical fiber system to realize remote measurement and control. (2) The anti-electromagnetic interference is strong, and the anti-electromagnetic interference is not easy to corrode, can be used in severe environments such as high temperature, high pressure and corrosion, has no obvious damage to human bodies, and is beneficial to application in the aspects of production and life. (3) The method has the advantages of high measurement sensitivity, distributed measurement, large transmission capacity, long service life and low manufacturing cost (document 1, Thanghayu, refractive index sensing research based on an optical fiber evanescent field [ D ]. university of Anhui, 2015.). The optical fiber evanescent field sensor obtains the relevant characteristics of surrounding substances by detecting the energy attenuation or wavelength drift of evanescent waves by utilizing the interaction between the evanescent field on the surface of the fiber core and the surrounding environment. The optical fiber evanescent wave sensor can be used for magnetic field detection (literature 2. extra waves, von moon, Syngnathus, and the like), optical article detection [ J ] based on the optical fiber evanescent wave sensor, 2015,35(a01):83-88.), biomass detection (literature 3. Liu jin Hua, Liu Tao, Meng, and the like, establishment of a method for detecting Listeria monocytogenes based on the optical fiber evanescent wave biosensor [ J ] Chinese experimental diagnostics, 2014(7):1045 and 1047), volatile organic substance detection (literature 4. Wingcelery, Licheng, Ozhilong, and the like, volatile organic substance detection device based on the optical fiber evanescent field: CN, CN203443888U [ P ] 2014, and the like. In order to enhance the interaction between the evanescent field of the surface of the fiber core and the medium, a part of the cladding of the fiber needs to be removed to improve the sensitivity of the sensor. There are two main methods for removing the cladding: etching methods and grinding methods. The corrosion method mainly utilizes hydrofluoric acid solution to manufacture the sensing optical fibers with different diameters by controlling the concentration and the corrosion time of the hydrofluoric acid solution, and has the advantages of low requirement on experimental conditions, low cost, smooth surface of the obtained optical fiber and the like.

Most of the proposed methods for etching optical fibers can only etch the optical fiber from one side, such as etching the optical fiber vertically fixed in a plastic tube (document 5.A. Iadiicco. S, Campiono, A. Cutolo, et al. Nonuniformthnned fiber Bragg gratings for a single fiber from active and dtemperous instruments [ J ], IEEE Photonics Technology Letters,2005,17(7):1495 + 1497), or placing one end of the optical fiber horizontally in an etching apparatus (document 6. Shiwei, house strength, brightness. an apparatus for achieving smooth taper etching of the surface of the optical fiber, CN 203938601U [ P ]. 2014.). The corrosion mode can not meet the actual requirement of corroding a certain section of optical fiber under certain conditions, on the other hand, hydrofluoric acid is extremely toxic and volatile, and is likely to cause injury to operators in the use process, and in addition, the corroded optical fiber is brittle and easy to break, and the problem of how to keep the integrity of the optical fiber is to be solved.

Disclosure of Invention

The device of the invention improves the defects in the prior art, and provides the optical fiber corrosion device with simple structure and convenient operation.

The technical scheme adopted by the invention is as follows:

an optical fiber corrosion device comprises an organic glass groove, a natural rubber plug, a reducing optical fiber guide tube, a support frame, a sealing cover and a base. The organic glass groove is fixed on the base, the notches at two sides of the organic glass groove are sealed by adhering a natural rubber plug with epoxy resin adhesive, and two supporting frames are respectively arranged at two sides of the organic glass groove and fixed on the base; the height of the support frame is the same as that of the organic glass groove, a through hole with the diameter of 1mm is formed in the support frame, the through hole is overlapped with the circle center of the natural rubber plug, and the support frame ensures the stability of the reducing optical fiber guide tubes, so that the reducing optical fiber guide tubes on two sides are parallel; the diameter of the variable diameter optical fiber guide pipe is gradually reduced from 4mm to 0.45mm, the variable diameter optical fiber guide pipe passes through the through hole of the support frame, the natural rubber plug is inserted into the organic glass groove, and the optical fiber is smoothly led in and out; the reducing optical fiber guide tube enters the organic glass groove through the support frame and the natural rubber plug, and the sealing cover is covered on the organic glass groove to ensure the sealing property.

The device has the advantages that the volume of the organic glass groove is small, the consumption of hydrofluoric acid can be effectively reduced, and the volatilization of hydrofluoric acid can be prevented after the sealing cover is arranged, so that the operation danger is reduced; the natural rubber plug blocks the notch of the organic glass groove, so that the corrosive liquid cannot leak after the reducing optical fiber guide tube is inserted; the diameter-changing treatment of the optical fiber guide tube is beneficial to smoothly leading in and out optical fibers; the support frame fixed on the base can ensure the parallelism and stability of the variable diameter optical fiber guide tubes on the left side and the right side.

Drawings

FIG. 1 is an overall schematic view of an optical fiber etching apparatus.

Fig. 2 is a top view of fig. 1.

Fig. 3 is a right side view of fig. 1.

Fig. 4 is a front view of fig. 1.

FIG. 5 is a graph of corrosion time versus fiber diameter.

Detailed Description

The following describes in detail a specific embodiment of the present invention with reference to the drawings.

As shown in the figure, the optical fiber corrosion device comprises an organic glass groove 1, wherein the organic glass groove is a cuboid, and is 20mm long, 5mm wide and 10mm deep; two sides of the organic glass groove are respectively provided with a natural rubber plug 4 (adhered by epoxy resin glue), and the natural rubber plug is a cylinder with the diameter of 11mm and the thickness of 1 mm; a diameter-variable optical fiber guide tube 3 is inserted on the natural rubber plug, the diameter of the natural rubber plug is gradually reduced from 4mm to 0.45mm, and the diameter-variable optical fiber guide tube is used for leading in and leading out optical fibers; the outside of the organic glass groove is provided with a support frame 2, the support frame is made of organic glass, the support frame and the organic glass groove have the same height, a through hole with the diameter of 1mm is formed in the support frame, the hole is superposed with the center of a circle of a natural rubber plug, a reducing optical fiber guide tube penetrates through the through hole of the support frame and is inserted into the natural rubber plug to enter the organic glass groove, and the support frame can ensure the stability of the reducing optical fiber guide tubes so that the reducing optical fiber guide tubes on two sides; the organic glass groove is provided with a sealing cover 5 which is made of organic glass, so that the corrosion caused by volatilization of hydrofluoric acid can be prevented from being uneven, and meanwhile, the safety guarantee is provided.

When the device is used, the coating layer of the part of the optical fiber needing to be corroded is stripped, the part is introduced into the organic glass groove through the reducing optical fiber guide tube, the area to be corroded is placed in the middle of the organic glass groove, a proper amount of hydrofluoric acid is added, and the sealing cover is covered. After a period of time, the thin-diameter optical fiber with a smooth surface can be obtained, and the sensing optical fibers with different diameters can be manufactured by controlling the concentration of hydrofluoric acid and the corrosion time. After the corrosion reaction is finished, the waste liquid is sucked out for proper treatment, deionized water is injected into the organic glass groove for multiple times to clean the optical fiber, and the optical fiber is led out from the reducing optical fiber guide tube after cleaning. The operation mode can effectively avoid the possible harm of hydrofluoric acid to operators.

In the following experimental examples, the optical fiber used was a normal single mode fiber, with a cladding diameter of 128um and a core diameter of 8.2 um. The length of the corrosion area is 10mm, the concentration of the used hydrofluoric acid is 40%, and the corrosion is carried out at constant temperature under the environment of 25 ℃. Etching for 15min, 30min, 45min, 60min, 80min, 85min and 90min respectively, wherein the experimental results are shown in the following table:

by fitting a straight line to the data in the above table, see FIG. 5, the equation for the change in fiber diameter over time can be derived:

D＝-1.275t+128.6。

Claims

1. an optical fiber corrosion device comprises an organic glass groove (1), a natural rubber plug (4), a reducing optical fiber guide pipe (3), a support frame (2), a sealing cover (5) and a base (6); the device is characterized in that an organic glass groove (1) is fixed on a base (6), notches on two sides of the organic glass groove (1) are sealed by adhering a natural rubber plug (4) with epoxy resin glue, and two sides of the organic glass groove (1) are respectively provided with a support frame (2) fixed on the base (6); the height of the support frame (2) is the same as that of the organic glass groove (1), a through hole with the diameter of 1mm is formed in the support frame (2), the hole is overlapped with the circle center of the natural rubber plug (4), and the support frame (2) ensures the stability of the reducing optical fiber guide tubes, so that the reducing optical fiber guide tubes on two sides are parallel; the diameter-variable optical fiber guide tube (3) is inserted into the natural rubber plug (4), the diameter of the diameter-variable optical fiber guide tube is gradually reduced from 4mm to 0.45mm, the diameter-variable optical fiber guide tube (3) penetrates through the through hole of the support frame (2), the natural rubber plug (4) is inserted into the organic glass groove (1), and the optical fiber is smoothly led in and out; the reducing optical fiber guide tube (3) enters the organic glass groove (1) through the support frame (2) and the natural rubber plug (4), and the sealing cover (5) is covered on the organic glass groove (1) to ensure the sealing property; so as to realize the corrosion of any area of the optical fiber and stably take out the corroded optical fiber after corrosion.

2. An optical fiber etching apparatus according to claim 1, wherein the organic glass tank (1) is a rectangular parallelepiped, 20mm long, 5mm wide, 10mm deep, and corrosion resistant.

3. An optical fiber etching device as claimed in claim 1, wherein the natural rubber stopper (4) is a cylinder with a diameter of 11mm and a thickness of 1mm, so as to ensure that no etching solution leaks after the guide tube of the reducing optical fiber is inserted.

4. An optical fiber etching device as claimed in claim 1, wherein the supporting frame (2) and the sealing cover (5) are made of organic glass to prevent uneven corrosion caused by volatilization of hydrofluoric acid, and provide safety guarantee and convenient observation.