Optical fiber corrosion system and method

Abstract

The invention discloses an optical fiber corrosion system, which comprises a corrosion container, which is provided with a reaction cavity, and is provided with a reflux inlet and an optical fiber port which are respectively communicated with the reaction cavity, the reaction cavity is used for containing corrosive liquid, and the optical fiber port is used for allowing an optical fiber to be processed to extend into the contained corrosive liquid; the backflow pipeline is provided with a steam channel and is provided with an air inlet and an air outlet which are respectively communicated with the steam channel, the air inlet of the backflow pipeline is communicated with the backflow port of the corrosion container, and the backflow pipeline is obliquely arranged so that the air outlet is higher than the air inlet; the heating device is used for heating the corrosion liquid in the corrosion container; the condensing device is used for cooling the corrosion steam in the return pipeline; and the treatment device is used for treating the corrosion steam flowing out of the return pipeline and is communicated with the steam outlet of the steam channel. The invention discloses an optical fiber corrosion method based on the system.

Description

Technical Field

[0001] The present invention relates to optical fiber corrosion technology, and in particular to an optical fiber corrosion system and method. Background Art

[0002] With the continuous development of modern industrial technology, the demand for temperature strain measurement in high temperature environments is increasing. In high-end manufacturing fields such as aerospace, nuclear energy, and petrochemicals, especially large and important equipment such as skins, rudders, and aircraft engines of hypersonic vehicles, they often work under extreme temperatures, and their structural safety and performance stability are directly related to the reliability and safety of the entire system. Therefore, sensing technology that can accurately monitor strain changes under high temperature conditions is crucial for applications in these fields. In order to achieve accurate decoupling of dual parameters, optical fiber sensors need to be designed structurally.

[0003] Existing methods for modifying optical fiber structures mainly include chemical corrosion and mechanical grinding. For example, the Chinese patent with application number CN201910619342.4 discloses an optical fiber corrosion container, which is composed of a polytetrafluoroethylene test tube, a test tube rack, a one-dimensional electric-controlled translation stage, a fiber fixture to be processed, a hydrofluoric acid solvent, an ultrasonic transducer, water, a plastic scraper, and a fume hood; there are small holes on the plastic scraper, the maximum size of the small holes is equal to the size of the optical fiber cladding, and the size of the small holes is adjusted by a return spring; the polytetrafluoroethylene test tube is filled with a hydrofluoric acid solvent, placed in a test tube rack and placed in an ultrasonic transducer filled with water, the fiber fixture to be processed is fixed on a one-dimensional electric-controlled translation stage, all the above components are placed in a fume hood, and the plastic scraper is placed above the liquid level of the hydrofluoric acid solvent.

[0004] However, the existing methods of chemically corroding and modifying optical fiber structures have at least the following disadvantages:

[0005] 1. The corrosion depth is difficult to control: Due to the lack of real-time monitoring, the corrosion depth and uniformity of traditional chemical corrosion methods are difficult to guarantee;

[0006] 2. The corrosion rate is too low: When the traditional method is used for materials with high hardness or corrosion resistance, such as single crystal materials such as sapphire, the corrosion efficiency is too low;

[0007] 3. Environmental pollution: Improper waste liquid treatment will cause environmental pollution, and traditional methods lack an effective waste liquid recovery mechanism;

[0008] 4. Insufficient safety: harmful gases are easily generated during the corrosion process, and the traditional process lacks complete exhaust and safety protection measures;

[0009] 5. Immature heating devices: Some traditional methods also reduce the diameter of the local optical fiber by heating and stretching, but this is not very controllable, and traditional temperature control devices are not integrated into the optical fiber corrosion system. Summary of the invention

[0010] In order to solve at least one of the above-mentioned shortcomings of the prior art, the present invention provides an optical fiber corrosion system and method.

[0011] The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0012] An optical fiber corrosion system, comprising:

[0013] The etching container has a reaction cavity, and is provided with a reflux port and an optical fiber port respectively connected to the reaction cavity, the reaction cavity is used to contain the etching liquid, and the optical fiber port is used for the optical fiber to be processed to extend into the contained etching liquid;

[0014] A reflux pipeline having a steam channel and provided with an air inlet and an air outlet respectively connected to the steam channel, the air inlet of the reflux pipeline being connected to the reflux port of the corrosion container, and the reflux pipeline being inclined so that the air outlet is higher than the air inlet;

[0015] A heating device, used to heat the corrosive liquid in the corrosive container;

[0016] A condensing device, used to cool the corrosive steam in the return line;

[0017] The processing device is used for processing the corrosive steam flowing out of the return pipeline and is connected with the gas outlet of the steam channel.

[0018] Furthermore, the corrosion container also includes a container body and a cover body, the container body has a cavity portion with one end closed and the other end open along its own axial direction, the cover body is detachably connected to the cavity opening of the container body to jointly construct the reaction cavity with the container body; the reflux port and the optical fiber port are arranged in the cover body.

[0019] Furthermore, the cover body includes a connecting portion and an abutting portion. On the radial plane of the cover body, the abutting portion is arranged around the radial periphery of the connecting portion. The connecting portion extends along its own axial direction into the cavity of the container, and the abutting portion extends in a direction away from the connecting portion, so as to increase the connection area between the two and the container, thereby improving the connection stability. When the cover body is connected to the container, the outer peripheral surface of the connecting portion is connected to the cavity wall of the container, and the bottom surface of the abutting portion abuts against the top surface of the opening of the container.

[0020] Furthermore, a connecting cavity is provided in the connecting portion, one end of the connecting cavity is connected with the containing cavity of the containing body to constitute a part of the reaction cavity, and the other end of the connecting cavity is connected with the return port and the optical fiber port; the radial dimension of the connecting cavity is smaller than the radial dimension of the containing cavity.

[0021] Furthermore, the cavity opening of the accommodating body extends axially to form an opening portion that cooperates with the connecting portion of the covering body, and the cavity portion adopts a gradient structure at least at one end facing the opening portion, and the radial dimension of the cavity portion at the gradient structure gradually decreases from the closed end to the open end until it becomes the same as the inner diameter of the opening portion.

[0022] Furthermore, the steam channel is composed of a plurality of expansion sections and a plurality of thin sections, the radial dimension of the expansion section is larger than the radial dimension of the thin section, and each expansion section is alternately connected with each thin section in sequence along the axial direction of the steam channel.

[0023] Furthermore, the radial dimension of the expansion section first gradually increases and then gradually decreases along the axial direction of the steam channel.

[0024] Furthermore, the heating device includes a heating cavity, a heater, a heat-conducting plate, an insulating plug, a temperature sensor and an electronic control module, wherein the heater, the heat-conducting plate, the insulating plug and the electronic control module are all located below the heating cavity; the heat-conducting plate is arranged on the heater for placing the corrosion container; the electronic control module is electrically connected to the heater to control the heater; the insulating plug is arranged at the periphery of the heating cavity to surround the corrosion container placed in the heating cavity; the temperature sensor is used to monitor the temperature of the corrosive liquid in the corrosion container, and is electrically connected to the electronic control module to feed back the monitored temperature to the electronic control module, so that the electronic control module can adjust the output current of the heater according to the monitored temperature to ensure that the temperature of the corrosive liquid is constant.

[0025] Furthermore, the condensing device includes a closed cover, a water inlet pipe, a water outlet pipe, a water tank and a water pump, the return pipe is arranged inside the closed cover, and its air inlet and air outlet extend out of the closed cover; the closed cover forms a condensing cavity that wraps the return pipe, and a water inlet joint and a water outlet joint that are respectively connected to the condensing cavity; the water inlet joint is connected to the water pump through the water inlet pipe, the water outlet joint is connected to the water tank through the water outlet pipe, and the water pump is connected to the water tank.

[0026] Furthermore, the processing device includes a processing container, processing materials and a connecting pipe, the processing material is arranged in the processing container; one end of the connecting pipe is connected to the air outlet of the reflux pipeline, and the other end penetrates into the processing container and extends to near the bottom of the processing container; an exhaust port is provided near the top of the processing container.

[0027] Furthermore, the optical fiber corrosion system also includes:

[0028] A fixing frame, an optical fiber clamp and a pipe clamp, wherein the fixing frame is arranged beside the heating device, and the optical fiber clamp and the pipe clamp are arranged on the fixing frame. The optical fiber clamp is used to clamp the optical fiber to be processed to fix the relative position between the optical fiber to be processed and the corrosion container, and the pipe clamp is used to clamp the return pipe to fix the relative position between the return pipe and the corrosion container.

[0029] Furthermore, the optical fiber corrosion system also includes:

[0030] The monitoring device comprises a spectrum demodulator and a host computer. The spectrum demodulator is coupled and connected with the optical fiber to be processed, and the host computer is electrically connected with the spectrum demodulator.

[0031] Furthermore, the optical fiber corrosion system also includes:

[0032] The filtering device comprises a closed working room, a fan and a filter. The corrosion container, the reflux pipeline, the heating device, the condensing device and the processing device are all arranged in the closed working room. The closed working room and the filter are connected through the fan.

[0033] An optical fiber corrosion method comprises the following steps:

[0034] Step 200: inserting the etching section of the optical fiber to be processed into the etching liquid through the optical fiber port of the etching container;

[0035] Step 300: starting the heating device and the condensing device, so that the heating device heats the corrosive liquid in the corrosion container, and the condensing device cools down the corrosive steam in the return pipeline;

[0036] Step 400: When the etched section of the optical fiber to be processed is etched to a target diameter, the etched section of the optical fiber to be processed is taken out from the etching container.

[0037] Furthermore, the optical fiber corrosion method comprises the following steps:

[0038] Step 100: forming an optical fiber device in the etched section of the optical fiber to be processed;

[0039] In step 400, a monitoring device is used to obtain a real-time spectrum of the optical fiber to be processed. When the similarity between the real-time spectrum of the optical fiber to be processed and a preset target spectrum reaches a preset threshold, it is determined that the corroded section of the optical fiber to be processed is corroded to the target diameter.

[0040] The present invention has the following beneficial effects:

[0041] The optical fiber corrosion system of the present invention is integrated with the heating device to heat the corrosion liquid in the corrosion container, thereby increasing the temperature of the corrosion liquid and accelerating the corrosion rate of the corrosion liquid on the optical fiber to be processed; and the reflux port is opened on the corrosion container to communicate with the reflux pipeline, so that the corrosion vapor generated when the corrosion liquid is heated can enter the reflux pipeline, and is cooled by the condensing device in the reflux pipeline, so as to be re-liquefied into the corrosion liquid and reflux into the corrosion container, while the unliquefied corrosion vapor in the reflux pipeline enters the processing device and is harmlessly treated by the processing device to prevent the corrosion vapor generated when the corrosion liquid is heated from overflowing and polluting the surrounding environment, thereby realizing efficient and safe corrosion modification of the optical fiber structure.

[0042] The optical fiber corrosion system of the present invention is integrated with the monitoring device to monitor the real-time spectrum of the optical fiber to be processed during the corrosion process of the optical fiber to be processed, thereby judging the corrosion condition of the optical fiber to be processed and improving the corrosion accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic structural diagram of the optical fiber corrosion system provided by the present invention.

[0044] Figure 2 This is a schematic diagram of the structure of the corrosion container in the optical fiber corrosion system provided by the present invention.

[0045] Figure 3 This is a schematic diagram of the structure of the heating device in the optical fiber corrosion system provided by the present invention.

[0046] Figure 4 A schematic structural diagram of another optical fiber corrosion system provided by the present invention.

[0047] Figure 5 A flowchart of the steps of the optical fiber corrosion method provided by the present invention.

[0048] Figure 6 A flowchart of another optical fiber corrosion method provided by the present invention.

[0049] Figure 7 This is a schematic diagram of the structural changes of the optical fiber to be processed in the optical fiber corrosion method provided by the present invention. DETAILED DESCRIPTION

[0050] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments, examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0051] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0052] In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0053] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] Embodiment 1

[0055] like Figure 1 As shown, an optical fiber corrosion system comprises:

[0056] The etching container 1 has a reaction chamber 11, and is provided with a reflux port 12 and an optical fiber port 13 respectively connected to the reaction chamber 11, the reaction chamber 11 is used to contain an etching liquid 14, and the optical fiber port 13 is used for allowing the optical fiber a to be processed to extend into the contained etching liquid 14;

[0057] A reflux pipeline 2 having a steam channel 21 and being provided with an air inlet 22 and an air outlet 23 respectively connected to the steam channel 21, the air inlet 22 of the reflux pipeline 2 being connected to the reflux port 12 of the corrosion container 1, and the reflux pipeline 2 being inclined so that the air outlet 23 is higher than the air inlet 22;

[0058] A heating device 3, used for heating the corrosion liquid 14 in the corrosion container 1;

[0059] A condensing device 4, used to cool the corrosive steam in the return line 2;

[0060] The processing device 5 is used to process the corrosive steam flowing out of the reflux pipeline 2 and is connected to the gas outlet 23 of the steam channel 21 .

[0061] The optical fiber corrosion system of the present invention is integrated with the heating device 3 to heat the corrosion liquid 14 in the corrosion container 1, thereby increasing the temperature of the corrosion liquid 14 and accelerating the corrosion rate of the corrosion liquid 14 on the optical fiber a to be processed; and the reflux port 12 is opened on the corrosion container 1 to communicate with the reflux pipeline 2, so that the corrosion vapor generated when the corrosion liquid 14 is heated can enter the reflux pipeline 2, and is cooled by the condensing device 4 in the reflux pipeline 2, so as to be re-liquefied into the corrosion liquid 14 and reflux into the corrosion container 1, while the unliquefied corrosion vapor in the reflux pipeline 2 enters the processing device 5 and is harmlessly treated by the processing device 5 to prevent the corrosion vapor generated when the corrosion liquid 14 is heated from overflowing and polluting the surrounding environment, thereby realizing efficient and safe corrosion modification of the optical fiber structure.

[0062] like Figure 2 As shown, the corrosion container 1 also includes a containing body 15 and a covering body 16. The containing body 15 has a cavity portion 151 with one end closed and the other end open along its own axial direction. The covering body 16 is detachably connected to the cavity opening 152 of the containing body 15 to construct the reaction chamber 11 together with the containing body 15. The reflux port 12 and the optical fiber port 13 are arranged in the covering body 16.

[0063] The container 15 may be in a cylindrical, box-shaped, spherical, ellipsoidal, flat, etc. In some examples, the container 15 is made of a corrosion-resistant transparent material, or partially made of a corrosion-resistant transparent material, so that the operator can observe the heating of the corrosive liquid 14 in the corrosion container 1 and the corrosion of the optical fiber a to be processed.

[0064] The containing body 15 and the covering body 16 may be rotationally connected via a threaded structure, or may be snap-fitted via a snap-fit ​​structure, or may be frictionally connected via an interference structure.

[0065] The cover body 16 includes a connecting portion 161 and a contact portion 162. On the radial plane of the cover body 16, the contact portion 162 is arranged around the radial periphery of the connecting portion 161. The connecting portion 161 extends along its own axial direction into the cavity portion 151 of the container 15, and the contact portion 162 extends in a direction away from the connecting portion 161 to increase the connection area between the two and the container 15, thereby improving the connection stability. When the cover body 16 is connected to the container 15, the outer peripheral surface of the connecting portion 161 is connected to the cavity wall of the container 15, and the bottom surface of the contact portion 162 is in contact with the top surface of the opening of the container 15.

[0066] A connecting cavity 163 is provided in the connecting portion 161, one end of the connecting cavity 163 is connected to the cavity 151 of the containing body 15 to form a part of the reaction cavity 11, and the other end of the connecting cavity 163 is connected to the reflux port 12 and the optical fiber port 13; the radial dimension of the connecting cavity 163 is smaller than the radial dimension of the cavity 151. According to the Bernoulli effect, when a fluid enters a small channel from a large channel, the flow rate will increase. Therefore, when the corrosive vapor generated by the heating of the corrosive liquid 14 enters the connecting cavity 163 with a smaller radial dimension from the cavity 151 with a larger radial dimension, the flow rate will increase, thereby improving the efficiency of discharge from the reflux pipeline 2.

[0067] The cavity opening 152 of the containing body 15 extends axially to form an opening portion 153 that cooperates with the connecting portion 161 of the cover body 16. The cavity portion 151 adopts a gradual structure 154 at least at one end facing the opening portion 153. The radial dimension of the cavity portion 151 at the gradual structure 154 gradually decreases from the closed end to the open end until it is the same as the inner diameter of the opening portion 153, so as to ensure that the cavity portion 151 has sufficient volume to hold the corrosive liquid 14, while reducing the size of the cover body 16, and also enable the corrosion vapor to gradually increase its flow rate instead of suddenly increasing when entering the connecting cavity portion 163 of the cover body 16.

[0068] Preferably, both the outer circumferential surface of the connection portion 161 and the inner circumferential surface of the opening portion 153 are provided with frosted microstructures to increase the friction between the two, thereby improving the connection stability.

[0069] like Figure 1As shown, the steam channel 21 is composed of a plurality of expansion sections 211 and a plurality of fine sections 212, the radial dimension of the expansion section 211 is larger than the radial dimension of the fine section 212, and each expansion section 211 is alternately connected with each fine section 212 in the axial direction of the steam channel 21, so that each time the corrosive steam flows from the fine section 212 into the adjacent expansion section 211, the flow rate can be reduced due to the reduction of the channel, so as to increase the residence time of the corrosive steam in each expansion section 211, thereby increasing the cooling treatment time of the corrosive steam by the condensing device 4.

[0070] Preferably, the radial dimension of the expansion section 211 gradually increases and then gradually decreases along the axial direction of the steam channel 21 to form a shape such as a sphere, an ellipsoid, a cube, or the like.

[0071] The air inlet 22 of the reflux pipeline 2 is connected to the reflux port 12 of the corrosion container 1 via a first elbow 24. The first elbow 24 can change the connection direction so that the axial direction of the reflux pipeline 2 is inclined at a certain angle relative to the axial direction of the corrosion container 1 to ensure the inclination angle of the reflux pipeline 2.

[0072] The radial dimension of the first elbow 24 gradually decreases from the end connected to the reflux pipeline 2 to the end connected to the corrosion container 1 to facilitate the collection of the reflux liquid, while increasing the contact area and improving the condensation efficiency.

[0073] like Figure 3 The heating device 3 includes a heating cavity 31, a heater 32, a heat-conducting plate 33, a heat-insulating plug 34 and an electric control module 35. The heater 32, the heat-conducting plate 33, the heat-insulating plug 34 and the electric control module 35 are all located below the heating cavity 31; the heat-conducting plate 33 is arranged on the heater 32 for placing the corrosion container 1; the electric control module 35 is electrically connected to the heater 32 to control the heater 32; the heat-insulating plug 34 is arranged on the periphery of the heating cavity 31 to surround the corrosion container 1 placed in the heating cavity 31.

[0074] The top of the heating cavity 31 is provided with an opening for allowing the cover body 16 of the corrosion container 1 in the heating cavity 31 to extend out.

[0075] The heat conducting plate 33 is used to evenly conduct the heat generated by the heater 32 to the bottom of the corrosion container 1 to evenly heat the corrosion liquid 14 in the corrosion container 1, and utilize the heat insulating plug 34 to reduce the heat loss of the corrosion container 1, while isolating the corrosion container 1 from the outside world to prevent the operator from touching the corrosion container 1, thereby improving safety.

[0076] Preferably, the heating device 3 also includes a temperature sensor such as a thermocouple, which is used to monitor the temperature of the corrosive liquid 14 in the corrosion container 1, and is electrically connected to the electric control module 35 to feed back the monitored temperature to the electric control module 35, so that the electric control module 35 can adjust the output current of the heater 32 according to the monitored temperature to ensure that the temperature of the corrosive liquid 14 is constant.

[0077] In some examples, the temperature sensor is fixed to the outer wall of the corrosion container 1 by bonding with a thermal conductive adhesive such as thermal grease, so as to monitor the temperature of the corrosion liquid 14 through the outer wall of the corrosion container 1; in some examples, the temperature sensor is arranged throughout the corrosion container 1, and is sealed and fixed to the corrosion container 1 by a sealant, so as to directly extend into the corrosion liquid 14 to monitor the temperature.

[0078] The condensing device 4 can cool the corrosive steam in the return pipe 2 by water cooling or air cooling. Figure 1 As shown, the condensing device 4 includes a closed cover 41, a water inlet pipe 42, a water outlet pipe 43, a water tank 44 and a water pump 45; the return pipe 2 is arranged inside the closed cover 41, and its air inlet 22 and air outlet 23 extend out of the closed cover 41; the closed cover 41 is formed with a condensing cavity 410 that wraps the return pipe 2, and a water inlet joint 411 and a water outlet joint 412 that are respectively connected to the condensing cavity 410; the water inlet joint 411 is connected to the water pump 45 through the water inlet pipe 42, the water outlet joint 412 is connected to the water tank 44 through the water outlet pipe 43, and the water pump 45 is connected to the water tank 44.

[0079] When the corrosive steam in the return pipe 2 is subjected to a cooling treatment, the water pump 45 extracts the coolant in the water tank 44 and pumps it into the sealed space between the closed cover 41 and the return pipe 2 through the water inlet pipe 42, so that the coolant absorbs the heat of the corrosive steam in the return pipe 2; as the water pump 45 pumps, the coolant after absorbing the heat is pumped back into the water tank 44 through the water outlet pipe 43, completing the heat exchange.

[0080] Preferably, the water inlet joint 411 is located at a position of the closed cover 41 close to the air inlet 22 of the return pipe 2, and the water outlet joint 412 is located at a position of the closed cover 41 close to the air outlet 23 of the return pipe 2, so that the coolant in the closed cover 41 can wrap the entire steam channel 21 of the return pipe 2 as much as possible.

[0081] like Figure 1As shown, the processing device 5 includes a processing container 51, a processing material 52 and a connecting pipe 53. The processing material 52 is arranged in the processing container 51; one end of the connecting pipe 53 is connected to the air outlet 23 of the reflux pipeline 2, and the other end penetrates into the processing container 51 and extends to the vicinity of the bottom of the processing container 51; an exhaust port 511 is provided near the top of the processing container 51.

[0082] The processing device 5 sets the exhaust port 511 near the top of the processing container 51, and extends the connecting pipe 53 to near the bottom of the processing container 51, so that after the corrosion vapor enters the processing container 51 from the connecting pipe 53, it can rise from the bottom of the processing material 52 to the top of the processing material 52, and finally be discharged from the exhaust port 511, so as to increase the residence time of the corrosion vapor in the processing container 51 and the contact time of the corrosion vapor with the processing material 52, thereby improving the harmless treatment efficiency.

[0083] The specific material of the treatment material 52 should depend on the specific material of the corrosive liquid 14, as long as it can react chemically, specifically bio-bind or physically adsorb with the harmful substances in the corrosive vapor.

[0084] The air outlet 23 of the reflux pipeline 2 is connected to the connecting pipe 53 via a second elbow 25. The second elbow 25 can change the connection direction so that the axial direction of the connecting pipe 53 is vertically arranged relative to the axial direction of the corrosion container 1 to ensure the verticality of the connecting pipe 53.

[0085] Preferably, the optical fiber corrosion system further comprises:

[0086] A fixing frame (not shown in the figure), a fiber optic clamp (not shown in the figure) and a pipe clamp (not shown in the figure), wherein the fixing frame is arranged beside the heating device 3, and the fiber optic clamp and the pipe clamp are arranged on the fixing frame, the fiber optic clamp is used to clamp the optical fiber a to be processed to fix the relative position between the optical fiber a to be processed and the corrosion container 1, and the pipe clamp is used to clamp the return pipe 2 to fix the relative position between the return pipe 2 and the corrosion container 1.

[0087] At the same time, a corrosion-resistant sealant is applied between the reflux pipeline 2 and the reflux port 12 of the cover body 16, so that the fixing frame can also apply a certain downward pressure to the cover body 16 through the reflux pipeline 2 to prevent the cover body 16 from being pushed open by the high-temperature and high-pressure corrosive steam in the corrosion container 1.

[0088] Embodiment 2

[0089] As an optimization solution of the first embodiment, in this embodiment, if Figure 1 As shown, the optical fiber corrosion system also includes:

[0090] The monitoring device 6 is used to monitor the real-time spectrum of the optical fiber a to be processed and is connected to the optical fiber a to be processed.

[0091] The monitoring device 6 includes a spectrum demodulator 61 and a host computer 62 . The spectrum demodulator 61 is coupled to the optical fiber a to be processed, and the host computer 62 is electrically connected to the spectrum demodulator 61 .

[0092] The optical fiber corrosion system of the present invention is integrated with the monitoring device to monitor the real-time spectrum of the optical fiber to be processed during the corrosion process of the optical fiber to be processed, thereby judging the corrosion condition of the optical fiber to be processed and improving the corrosion accuracy.

[0093] Before the corrosion, a fiber device is first processed and manufactured in the corrosion section of the optical fiber a to be processed. The fiber device may be, but is not limited to, a fiber grating, a fiber microcavity, or a fiber weak reflection point. During the corrosion process, the spectrum demodulator 61 emits a monitoring light signal into the optical fiber a to be processed, and receives the reflected light signal modulated by the optical fiber device and reflected back, and then demodulates the reflected light signal to obtain the resonance spectrum of the optical fiber device as the real-time spectrum of the optical fiber a to be processed; during the corrosion process, as the diameter of the corrosion section a1 of the optical fiber a to be processed gradually decreases, the high-order mode of the optical fiber a1 to be processed gradually decreases, and the bandwidth and resonance peak of the real-time spectrum will change; the host computer 62 is responsible for comparing the real-time spectrum of the optical fiber a to be processed with the preset target spectrum, calculating the similarity between the two, and when the similarity between the two reaches the preset threshold, the operator is prompted to end the corrosion.

[0094] Alternatively, a lifting platform can be added between the fixed frame and the optical fiber clamp. When the calculated similarity reaches a preset threshold, the upper computer 62 sends a control instruction to the lifting platform to control the lifting platform to rise, thereby automatically removing the optical fiber a to be processed from the corrosion container 1.

[0095] Embodiment 3

[0096] As an optimization solution of Embodiment 1 or Embodiment 2, in this embodiment, if Figure 4 As shown, the optical fiber corrosion system also includes:

[0097] The filtering device 7 includes a closed working room 71, a fan 72 and a filter 73. The corrosion container 1, the reflux pipeline 2, the heating device 3, the condensing device 4 and the processing device 5 are all arranged in the closed working room 71. The closed working room 71 and the filter 73 are connected through the fan 72.

[0098] The corrosive steam discharged from the treatment device 5 after treatment, as well as the corrosive steam leaked from the connection between the corrosion container 1, the reflux pipeline 2, the heating device 3, the condensing device 4 and the treatment device 5, are sent to the filter 73 through the fan 72 in the closed working room 71 to further filter out harmful impurities in the corrosive steam to ensure the safety and cleanliness of the environment.

[0099] In some examples, the enclosed working room 71 is made of corrosion-resistant transparent material, or partially made of corrosion-resistant transparent material, so that the operator can observe the heating condition of the corrosive liquid 14 and the corrosion condition of the optical fiber a to be processed through the enclosed working room 71.

[0100] The monitoring device 6 is disposed outside the closed working room 71 and passes through the closed working room 71 so as to be coupled and connected with the optical fiber a to be processed.

[0101] In some examples, the water tank 44 and the water pump 45 of the condensing device 4 may be integrated on the bottom or other sides of the closed working chamber 71 .

[0102] Embodiment 4

[0103] like Figure 5 and 7 As shown, a method for optical fiber corrosion is used in the optical fiber corrosion system described in the first embodiment, the second embodiment or the third embodiment; the optical fiber corrosion method comprises the following steps:

[0104] Step 200: extending the etching section a1 of the optical fiber a to be processed into the etching liquid 14 through the optical fiber port 13 of the etching container 1;

[0105] Step 300: starting the heating device 3 and the condensing device 4, so that the heating device 3 heats the corrosive liquid 14 in the corrosion container 1, and the condensing device 4 cools down the corrosive steam in the return pipe 2;

[0106] Step 400: When the etched segment a1 of the optical fiber a to be processed is etched to a target diameter, the etched segment a1 of the optical fiber a to be processed is taken out from the etching container 1.

[0107] Embodiment 5

[0108] As an optimization solution of the first embodiment, in this embodiment, if Figure 6 and 7 As shown, the optical fiber corrosion method comprises the following steps:

[0109] Step 100: manufacturing an optical fiber device a5 in the etching section a1 of the optical fiber a to be processed;

[0110] In step 400, the monitoring device 6 is used to obtain the real-time spectrum of the optical fiber a to be processed. When the similarity between the real-time spectrum of the optical fiber a to be processed and the preset target spectrum reaches a preset threshold, it is determined that the corrosion section a1 of the optical fiber a to be processed is corroded to the target diameter.

[0111] The optical fiber device a5 may be, but is not limited to, an optical fiber grating, an optical fiber microcavity or an optical fiber weak reflection point, and may be, but is not limited to, manufactured by femtosecond laser direct writing, carbon dioxide laser ablation or ultraviolet phase mask method.

[0112] Preferably, the non-corroded section a2 of the optical fiber a to be processed is externally provided with a protective tube b, and the protective tube b is a rigid tube body, which can increase the diameter and hardness of the optical fiber a to be processed at the non-corroded section a2 to facilitate clamping and fixing.

[0113] Preferably, different materials are used between the optical fiber a to be processed and the protective tube b, so that the optical fiber a to be processed and the protective tube b can be corroded by different solutions respectively, that is, there is at least one corrosive liquid 14 that can only corrode the optical fiber a to be processed but cannot corrode the protective tube b, and there is also at least one stripping liquid that can only corrode the protective tube b but cannot corrode the optical fiber a to be processed.

[0114] For example, if the optical fiber a to be processed is made of quartz material, and the protective tube b is made of a crystalline material such as sapphire, zirconium oxide, lutetium oxide, etc., the etching liquid 14 may be, but is not limited to, hydrofluoric acid, and the stripping liquid may be, but is not limited to, a mixture of sulfuric acid and phosphoric acid; if the optical fiber a to be processed is made of a crystalline material such as sapphire, zirconium oxide, lutetium oxide, etc., and the protective tube b is made of quartz material, the etching liquid 14 may be, but is not limited to, a mixture of sulfuric acid and phosphoric acid, and the stripping liquid may be, but is not limited to, hydrofluoric acid.

[0115] In this way, when the optical fiber a to be processed is extended into the corrosion container 1, the corrosion section a1 of the optical fiber a to be processed can be completely immersed in the corrosion liquid 14, while the non-corrosion section a2 of the optical fiber a to be processed located above the corrosion liquid 14 will not be corroded by the corrosion liquid or corrosion steam due to the protective effect of the protective tube b; and after the processing of the corrosion section a1 is completed, the stripping liquid is used to corrode and strip the protective tube b outside the optical fiber a to be processed.

[0116] And in the corrosion process, such as Figure 7 As shown, as the corrosive liquid 14 corrodes the corrosive section a1 of the optical fiber a to be processed, the diameter of the corrosive section a1 gradually decreases, and the end side a3 close to the corrosive section a1 in the non-corrosive section a2 protected by the protective tube b will gradually be exposed, and the exposed end side a3 will continue to be corroded after contacting with the corrosive liquid 14 or the corrosive steam, so that the end of the non-corrosive section a2 close to the corrosive section a1 is also corroded by the corrosive liquid 14 or the corrosive steam, and the closer the position of the end is to the corrosive section a1, the greater the degree of corrosion and the smaller the diameter, and finally a conical gradient section a4 with a gradually changing diameter is formed in the non-corrosive section a2 close to the corrosive section a1.

[0117] If the optical fiber a to be processed is a crystal fiber without a cladding structure, such as sapphire fiber, zirconia fiber, lutetium oxide fiber or YAG fiber, the tapered gradient section a4 can reduce the high coupling loss caused by the change in optical fiber diameter when the optical signal enters the corroded section a1 from the non-corroded section a2, thereby improving the spectral signal-to-noise ratio of the optical fiber a to be processed.

[0118] Preferably, in order not to excite the leaked high-order mode and cause large light loss, it is necessary to reduce the cone angle of the tapered gradient section a4 as much as possible to improve the spectral signal-to-noise ratio of the optical fiber a to be processed, and the diameter change rate of the tapered gradient section a4 satisfies the following formula:

[0119]

[0120] Wherein, β1 is the local propagation constant of the fundamental mode of the optical fiber a to be processed, β2 is the local propagation constant of the high-order mode of the optical fiber a to be processed, and dr is the diameter change of the tapered gradient section a4 within the unit length dl.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention rather than to limit them. Although the embodiments of the present invention have been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the embodiments of the present invention can still be modified or replaced by equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An optical fiber corrosion system, characterized in that: include: The etching container has a reaction cavity, and is provided with a reflux port and an optical fiber port respectively connected to the reaction cavity, the reaction cavity is used to contain the etching liquid, and the optical fiber port is used for the optical fiber to be processed to extend into the contained etching liquid; A reflux pipeline having a steam channel and provided with an air inlet and an air outlet respectively connected to the steam channel, the air inlet of the reflux pipeline being connected to the reflux port of the corrosion container, and the reflux pipeline being inclined so that the air outlet is higher than the air inlet; A heating device, used to heat the corrosive liquid in the corrosive container; A condensing device, used to cool the corrosive steam in the return line; The processing device is used for processing the corrosive steam flowing out of the return pipeline and is connected with the gas outlet of the steam channel.

2. The optical fiber corrosion system according to claim 1, characterized in that: The corrosion container also includes a container body and a cover body. The container body has a cavity portion with one end closed and the other end open along its own axial direction. The cover body is detachably connected to the cavity opening of the container body to jointly construct the reaction cavity with the container body; the reflux port and the optical fiber port are arranged in the cover body.

3. The optical fiber corrosion system according to claim 2, characterized in that: The cover body includes a connecting portion and an abutting portion. On the radial plane of the cover body, the abutting portion is arranged around the radial periphery of the connecting portion. The connecting portion extends along its own axial direction into the cavity of the container, and the abutting portion extends in a direction away from the connecting portion, so as to increase the connection area between the two and the container, thereby improving the connection stability. When the cover body is connected to the container, the outer peripheral surface of the connecting portion is connected to the cavity wall of the container, and the bottom surface of the abutting portion abuts against the top surface of the opening of the container.

4. The optical fiber corrosion system according to claim 3, characterized in that: A connecting cavity is provided in the connecting portion, one end of which is connected to the containing cavity of the containing body to constitute a part of the reaction cavity, and the other end of which is connected to the return port and the optical fiber port; the radial dimension of the connecting cavity is smaller than the radial dimension of the containing cavity.

5. The optical fiber corrosion system according to claim 4, characterized in that: The cavity opening of the accommodating body extends axially to form an opening portion that cooperates with the connecting portion of the cover body. The cavity portion adopts a gradual structure at least at one end facing the opening portion. The radial dimension of the cavity portion at the gradual structure gradually decreases from the closed end to the open end until it becomes the same as the inner diameter of the opening portion.

6. The optical fiber corrosion system according to claim 5, characterized in that: The steam channel is composed of a plurality of expansion sections and a plurality of thin sections. The radial dimension of the expansion section is larger than the radial dimension of the thin section. The expansion sections are alternately connected with the thin sections in sequence along the axial direction of the steam channel.

7. The optical fiber corrosion system according to claim 6, characterized in that: The radial dimension of the expansion section gradually increases and then gradually decreases along the axial direction of the steam channel.

8. The optical fiber corrosion system according to claim 1, characterized in that: The heating device comprises a heating cavity, a heater, a heat conducting plate, a heat insulating plug, a temperature sensor and an electric control module, wherein the heater, the heat conducting plate, the heat insulating plug and the electric control module are all located below the heating cavity; the heat conducting plate is arranged on the heater and is used to place the corrosion container; The electric control module is electrically connected to the heater to control the heater; the heat insulating plug is arranged at the periphery of the heating cavity to surround the corrosion container placed in the heating cavity; the temperature sensor is used to monitor the temperature of the corrosion liquid in the corrosion container, and is electrically connected to the electric control module to feed back the monitored temperature to the electric control module, so that the electric control module can adjust the output current of the heater according to the monitored temperature to ensure that the temperature of the corrosion liquid is constant.

9. The optical fiber corrosion system according to claim 1, characterized in that: The condensing device includes a closed cover, a water inlet pipe, a water outlet pipe, a water tank and a water pump; the return pipeline is arranged inside the closed cover, and its air inlet and air outlet extend out of the closed cover; the closed cover is formed with a condensing cavity wrapping the return pipeline, and a water inlet joint and a water outlet joint respectively connected to the condensing cavity; the water inlet joint is connected to the water pump through the water inlet pipe, the water outlet joint is connected to the water tank through the water outlet pipe, and the water pump is connected to the water tank.

10. The optical fiber corrosion system according to claim 1, characterized in that: The processing device includes a processing container, processing materials and a connecting pipe. The processing materials are arranged in the processing container; one end of the connecting pipe is connected to the air outlet of the reflux pipeline, and the other end penetrates into the processing container and extends to the vicinity of the bottom of the processing container; an exhaust port is provided near the top of the processing container.

11. The optical fiber corrosion system according to claim 1, characterized in that: The optical fiber corrosion system also includes: A fixing frame, an optical fiber clamp and a pipe clamp, wherein the fixing frame is arranged beside the heating device, and the optical fiber clamp and the pipe clamp are arranged on the fixing frame. The optical fiber clamp is used to clamp the optical fiber to be processed to fix the relative position between the optical fiber to be processed and the corrosion container, and the pipe clamp is used to clamp the return pipe to fix the relative position between the return pipe and the corrosion container.

12. The optical fiber corrosion system according to claim 1, characterized in that: The optical fiber corrosion system also includes: The monitoring device comprises a spectrum demodulator and a host computer. The spectrum demodulator is coupled and connected with the optical fiber to be processed, and the host computer is electrically connected with the spectrum demodulator.

13. The optical fiber corrosion system according to claim 1, characterized in that: The optical fiber corrosion system also includes: The filtering device comprises a closed working room, a fan and a filter. The corrosion container, the reflux pipeline, the heating device, the condensing device and the processing device are all arranged in the closed working room. The closed working room and the filter are connected through the fan.

14. A method for corroding an optical fiber, characterized in that: The steps include: Step 200: inserting the etching section of the optical fiber to be processed into the etching liquid through the optical fiber port of the etching container; Step 300: starting the heating device and the condensing device, so that the heating device heats the corrosive liquid in the corrosion container, and the condensing device cools down the corrosive steam in the return pipeline; Step 400: When the etched section of the optical fiber to be processed is etched to a target diameter, the etched section of the optical fiber to be processed is taken out from the etching container.

15. The optical fiber corrosion method according to claim 14, characterized in that: The optical fiber corrosion method comprises the following steps: Step 100: forming an optical fiber device in the etched section of the optical fiber to be processed; In step 400, a monitoring device is used to obtain a real-time spectrum of the optical fiber to be processed. When the similarity between the real-time spectrum of the optical fiber to be processed and a preset target spectrum reaches a preset threshold, it is determined that the corroded section of the optical fiber to be processed is corroded to the target diameter.

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