Optical fiber quantitative corrosion substrate, device, system and prepared optical fiber detection structure

Abstract

The present invention discloses a fiber optic quantitative corrosion substrate, device and system. The corrosion fiber optic structure is located in the corrosion channel of the corrosion substrate, the monitoring fiber optic structure is placed in the monitoring channel, and the liquid inlet section of the corrosion liquid inlet channel is connected to the corrosion channel and the monitoring channel respectively through two liquid inlet connections; by demodulating the transmission spectrum of the monitoring fiber optic structure in the monitoring channel, the corrosion progress of the corrosion fiber optic structure in the corrosion liquid is monitored, and quantitative corrosion of the fiber optic structure to be corroded in the corrosion channel can be achieved, thereby achieving accurate quantitative corrosion of the outer cladding of the optical fiber. The present invention also proposes an optical fiber detection structure.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber quantitative corrosion, and in particular to an optical fiber quantitative corrosion substrate, a device, a system and a prepared optical fiber detection structure. Background Art

[0002] Fiber optic sensors have shown great application potential in biochemical analysis, food testing, environmental testing, medical testing and other fields due to their high sensitivity, compact structure, high integration and low preparation cost. Depending on the usage scenario and needs, the existing optical fiber needs to be processed into the required structure. Hydrofluoric acid is widely used in the field of micro-nano optical fiber processing. Different doped quartz materials can be corroded by hydrofluoric acid into various microcavities and molds. Compared with traditional micro-nano processing technologies such as femtosecond laser and ion beam etching, the cost is lower. However, due to the strong toxicity, irritation and corrosiveness of hydrofluoric acid, some of its corrosion work is limited, and it is impossible to accurately quantify the corrosion, let alone monitor its corrosion progress in real time. Summary of the invention

[0003] In order to solve the technical problems existing in the background technology, the present invention proposes an optical fiber quantitative corrosion substrate, device, system and the prepared optical fiber detection structure.

[0004] The present invention proposes an optical fiber quantitative corrosion matrix, wherein a corrosion channel for placing a corroded optical fiber structure, a monitoring channel for placing a monitoring optical fiber structure, and a corrosion liquid inlet channel are provided in the corrosion matrix, a corrosion section is provided in the middle of the corrosion channel, a monitoring section is provided in the middle of the monitoring channel, and the corrosion liquid inlet channel includes an inlet section and two inlet connecting sections connected to the inlet section, and the two inlet connecting sections are connected to the corrosion section and the monitoring section, respectively.

[0005] Preferably, a liquid outlet channel for the corrosive liquid is further provided in the corrosive matrix, and the liquid outlet channel for the corrosive liquid comprises a liquid outlet section and two liquid outlet connecting sections connected with the liquid outlet section, and the two liquid outlet connecting sections are connected with the corrosive section and the monitoring section respectively.

[0006] Preferably, the corrosion channel and the monitoring channel are arranged in parallel, and the corrosion liquid inlet channel and the corrosion liquid outlet channel are located between the two and are located at both ends of the corrosion section and the monitoring section respectively.

[0007] Preferably, the preparation is carried out through the following steps: firstly, the PDMS solution and the curing agent are prepared in a ratio of 10:1, and after ultrasonic stirring, they are poured into a mold and cured at a temperature of 70°C.

[0008] The present invention also proposes an optical fiber quantitative corrosion detection device, including a monitoring optical fiber structure and the above-mentioned optical fiber quantitative corrosion matrix, the monitoring optical fiber structure is located in a monitoring channel, and a detection part is provided in the middle of the monitoring optical fiber structure, and the detection part is located in the monitoring section.

[0009] Preferably, the monitoring optical fiber structure has a hollow optical fiber in the middle, and the hollow optical fiber is located in the monitoring section.

[0010] Preferably, the monitoring optical fiber structure includes a first single-mode optical fiber, a hollow optical fiber, and a second single-mode optical fiber that are fused in sequence.

[0011] The present invention also provides an optical fiber quantitative corrosion system, comprising the above-mentioned optical fiber quantitative corrosion device.

[0012] Preferably, it also includes: a broadband coherent light source, a fiber coupler and a spectrometer;

[0013] The optical fiber coupler has an incident end, a first output end for connecting to the optical fiber structure to be corroded, and a second output end for connecting to the monitoring optical fiber structure. A broadband coherent light source is connected to the incident end of the optical fiber coupler, and a spectrometer is used to obtain optical signals of the optical fiber structure to be corroded and the monitoring optical fiber structure.

[0014] In the present invention, the proposed optical fiber quantitative corrosion substrate, device and system, the corrosion optical fiber structure is located in the corrosion channel of the corrosion substrate, the monitoring optical fiber structure is placed in the monitoring channel, and the liquid inlet section of the corrosion liquid inlet channel is connected with the corrosion channel and the monitoring channel respectively through two liquid inlet connections; by demodulating the transmission spectrum of the monitoring optical fiber structure in the monitoring channel, the corrosion progress of the corrosion optical fiber structure in the corrosion liquid is monitored, and quantitative corrosion of the optical fiber structure to be corroded in the corrosion channel can be achieved, thereby achieving accurate quantitative corrosion of the outer cladding of the optical fiber.

[0015] The present invention also provides an optical fiber detection structure, including an optical fiber segment corroded by the above-mentioned optical fiber quantitative corrosion system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of an implementation method of an optical fiber quantitative corrosion matrix proposed by the present invention.

[0017] Figure 2 This is a schematic structural diagram of an implementation of a monitoring optical fiber structure of an optical fiber quantitative corrosion device proposed by the present invention.

[0018] Figure 3 This is a schematic structural diagram of an embodiment of an optical fiber quantitative corrosion device proposed by the present invention.

[0019] Figure 4 This is a schematic structural diagram of an implementation of an optical fiber quantitative corrosion system proposed by the present invention.

[0020] Figure 5 This is a detection spectrum diagram for monitoring the optical fiber structure in one embodiment of an optical fiber quantitative corrosion system proposed by the present invention.

[0021] Figure 6 A structural schematic diagram of an implementation scheme of an optical fiber detection structure of an optical fiber quantitative corrosion system proposed by the present invention.

[0022] Figure 7 This is a schematic structural diagram of a suspended core optical fiber before corrosion in one embodiment of an optical fiber detection structure proposed by the present invention.

[0023] Figure 8 This is a schematic structural diagram of a suspended core optical fiber with a side hole after corrosion in one embodiment of an optical fiber detection structure proposed by the present invention. DETAILED DESCRIPTION

[0024] like Figures 1 to 8 As shown, Figure 1 This is a schematic structural diagram of an embodiment of an optical fiber quantitative corrosion matrix proposed by the present invention. Figure 2 This is a schematic diagram of a structure of an embodiment of a monitoring optical fiber structure of an optical fiber quantitative corrosion device proposed by the present invention. Figure 3 This is a schematic structural diagram of an embodiment of an optical fiber quantitative corrosion device proposed by the present invention. Figure 4 This is a schematic diagram of the structure of an embodiment of an optical fiber quantitative corrosion system proposed by the present invention. Figure 5 This is a detection spectrum diagram for monitoring the optical fiber structure in one embodiment of an optical fiber quantitative corrosion system proposed by the present invention. Figure 6 This is a schematic diagram of an embodiment of an optical fiber detection structure of an optical fiber quantitative corrosion system proposed by the present invention. Figure 7 This is a schematic diagram of the structure of a suspended core optical fiber before corrosion in one embodiment of an optical fiber detection structure proposed by the present invention. Figure 8 This is a schematic structural diagram of a suspended core optical fiber with a side hole after corrosion in one embodiment of an optical fiber detection structure proposed by the present invention.

[0025] Reference Figure 1 The present invention proposes a quantitative optical fiber corrosion matrix, wherein the corrosion matrix 10 is provided with a corrosion channel 11 for placing a corrosion optical fiber structure, a monitoring channel 13 for placing a monitoring optical fiber structure, and a corrosion liquid inlet channel 12. A corrosion section is provided in the middle of the corrosion channel 11, and a monitoring section is provided in the middle of the monitoring channel 13. The corrosion liquid inlet channel 12 includes an inlet section and two inlet connecting sections connected to the inlet section, and the two inlet connecting sections are connected to the corrosion section and the monitoring section respectively.

[0026] Specifically, the optical fiber quantitative corrosion matrix of this embodiment can be prepared by the following steps: first, PDMS (Polydimethylsiloxane) solution and curing agent are configured in a ratio of 10:1, ultrasonically stirred and poured into a mold, left to stand at room temperature, and cured at 70°C until there are no bubbles in the solution. Among them, the PMDS model is SYLGARD 184 and the curing agent. Finally, the cured PDMS corrosion matrix is ​​ultrasonically cleaned with an ultrasonic instrument to remove debris and other impurities on the outside of the corrosion matrix.

[0027] In order to explain in detail the specific working mode of the optical fiber quantitative corrosion matrix of this embodiment, refer to Figure 3 This embodiment also proposes a fiber optic quantitative corrosion detection device, including a monitoring fiber optic structure and the above-mentioned fiber optic quantitative corrosion substrate 10, the monitoring fiber optic structure is located in the monitoring channel 13, and the middle of the monitoring fiber optic structure has a detection part, and the detection part is located in the monitoring section.

[0028] Reference Figure 2 In the specific design of the monitoring optical fiber structure, the monitoring optical fiber structure has a hollow optical fiber 22 in the middle, and the hollow optical fiber 22 is located in the monitoring section. Specifically, the monitoring optical fiber structure includes a first single-mode optical fiber 21, a hollow optical fiber 22, and a second single-mode optical fiber 23 that are fused in sequence.

[0029] The core diameters of the first single-mode optical fiber and the second single-mode optical fiber can be 8.2 μm, the air core diameter of the hollow optical fiber can be 20 μm, and the positive axis is fused. The single-mode optical fiber can be of Coning SMF-28.

[0030] According to the transmission sidewall antiresonance spectrum, the resonant wavelength is:

[0031]

[0032] Where m is the order of the side wall resonance peak. It can be seen that the resonant wavelength position is only affected by the hollow core fiber side wall thickness, refractive index, and core refractive index, and has nothing to do with the hollow core fiber length. And correspondingly, the free spectral range of the transmission spectrum based on the side wall resonance principle is:

[0033]

[0034] It can be seen that when the hollow core fiber material is determined, the free spectrum range is only affected by the side wall thickness h, and will decrease as h increases. Therefore, when the side wall of the hollow core fiber 22 is corroded, the thickness h decreases, the resonant wavelength position and the free spectrum range both change, and the side wall thickness is monitored by demodulating the resonant wavelength variable, that is, the degree of corrosion of the hollow tube is monitored.

[0035] In the specific monitoring process of corrosion progress, refer to Figure 4 This embodiment also provides an optical fiber quantitative corrosion system, including the optical fiber quantitative corrosion device mentioned above. Specifically, it also includes: a broadband coherent light source 40, an optical fiber coupler 50 and a spectrometer 60;

[0036] The fiber coupler 50 has an incident end, a first output end for connecting to the fiber structure to be corroded, and a second output end for connecting to the monitoring fiber structure. The broadband coherent light source 40 is connected to the incident end of the fiber coupler 50, and the spectrometer 60 is used to obtain optical signals of the fiber structure to be corroded and the monitoring fiber structure.

[0037] In the specific corrosion process, the optical fiber detection structure to be corroded is placed in the corrosion channel, and the monitoring detection structure is placed in the monitoring channel. The broadband coherent light source is connected to one end of the optical fiber detection structure to be corroded and the monitoring detection structure through the optical fiber coupler, and the spectrometer is connected to the other ends of the two. The hydrofluoric acid corrosion liquid is injected into the corrosion channel and the monitoring channel through the corrosion liquid inlet channel, and then the optical signal changes of the two are obtained by the spectrometer. The corrosion progress is monitored by monitoring the optical fiber structure, thereby realizing the precise corrosion of the optical fiber detection structure.

[0038] In the specific design, the transmission side wall anti-resonance sensing structure uses an optical fiber jumper to connect the excitation broadband light source (Broadband light Source, referred to as BBS; the spectral range is 1400nm to 1600nm) and the optical spectrum analyzer (YOKOGAWA, AQ6370B; Optical Spectrum Analyser, referred to as OSA), the broadband light source is a coherent light source, and the optical spectrum analyzer is used for data collection. The transmission anti-resonance light field intensity is:

[0039]

[0040] Among them, r is the reflection coefficient between the air core and the inner surface, and r' is approximately equal to the reflection coefficient between the outer surface and the air. Therefore, the intensity of the antiresonance peak in the spectrum of the monitoring optical fiber structure has a great relationship with the refractive index of the surrounding liquid and the reflectivity of the hollow fiber.

[0041] According to Finnier's formula, the change in refractive index has little effect on the reflection coefficient of the hollow-core optical fiber, which is much smaller than the reflection coefficient in the air. When the surrounding environment is liquid, the intensity of the anti-resonance light field is extremely small. Therefore, in the specific monitoring process, the corrosive liquid in the monitoring channel can be regularly extracted, and the corrosion degree of the hollow-core optical fiber can be monitored by detecting the optical signal of the hollow-core optical fiber in the air after corrosion, thereby monitoring the corrosion of the outer cladding of the corroded optical fiber structure. While ensuring the existence of the side wall anti-resonance phenomenon, real-time monitoring of the corrosion rate is achieved.

[0042] Figure 5 is the detection signal obtained through the hollow optical fiber. Figure 5 It can be seen that the movement of the antiresonance peak near 1570nm within 1-10 minutes shows that as the corrosion time increases, the antiresonance peak moves toward the shorter wavelength direction. By demodulating the antiresonance peak position, the corrosion degree can be monitored.

[0043] In the present embodiment, the proposed optical fiber quantitative corrosion substrate, device and system, the corrosion optical fiber structure is located in the corrosion channel of the corrosion substrate, the monitoring optical fiber structure is placed in the monitoring channel, and the liquid inlet section of the corrosion liquid inlet channel is connected to the corrosion channel and the monitoring channel respectively through two liquid inlet connections; the corrosion optical fiber structure is located in the corrosion channel of the corrosion substrate, the monitoring optical fiber structure is placed in the monitoring channel, and the liquid inlet section of the corrosion liquid inlet channel is connected to the corrosion channel and the monitoring channel respectively through two liquid inlet connections; by demodulating the transmission spectrum of the monitoring optical fiber structure in the monitoring channel, the corrosion progress of the corrosion optical fiber structure in the corrosion liquid is monitored, and quantitative corrosion of the optical fiber structure to be corroded in the corrosion channel can be achieved, thereby achieving accurate quantitative corrosion of the optical fiber outer cladding.

[0044] In a specific embodiment of the corrosion substrate, a corrosion liquid outlet channel 14 is further provided in the corrosion substrate 10, and the corrosion liquid outlet channel 14 includes an outlet section and two outlet connecting sections connected to the outlet section, and the two outlet connecting sections are connected to the corrosion section and the monitoring section respectively. Further, the corrosion channel 11 and the monitoring channel 13 are arranged in parallel, and the corrosion liquid inlet channel 12 and the corrosion liquid outlet channel 14 are located between the two and are located at both ends of the corrosion section and the monitoring section respectively. The two outlet connecting sections, the corrosion section, the two inlet connecting sections and the monitoring section are connected in sequence from head to tail to form a zigzag channel, which ensures that the corrosion liquid in the corrosion section and the monitoring section flows fully, ensures that the concentration of the corrosion liquid is uniform, and further ensures the accuracy of corrosion progress monitoring.

[0045] In actual device selection, the broadband coherent light source can adopt an operating wavelength of 1400-1600nm and a maximum power of 10mw.

[0046] This embodiment also provides an optical fiber detection structure, which includes an optical fiber segment corroded by the above-mentioned optical fiber quantitative corrosion system.

[0047] Specifically, it includes a third single-mode optical fiber 31, a side-hole suspension core optical fiber 32 and a fourth single-mode optical fiber 33 which are connected in sequence. The side wall of the side-hole suspension core optical fiber 32 has an opening, and the opening has a side core. The side-hole suspension core optical fiber 32 is formed by corroding the suspension core optical fiber in the above-mentioned optical fiber quantitative corrosion system. In the specific corrosion process, firstly, the two ends of the suspension core optical fiber are fused with single-mode optical fibers respectively. Then, the above-mentioned optical fiber structure is placed in the corrosion channel as a whole, so that the suspension core optical fiber is located in the corrosion section, and then the corrosion progress of the suspension core optical fiber can be monitored by monitoring the hollow optical fiber in the channel, thereby realizing the precise corrosion of the side-hole suspension core optical fiber structure. The side wall of the side-hole suspension core optical fiber obtained after corrosion is corroded, while ensuring that the side core is not corroded, so that the side core can be in direct contact with the liquid to be measured, thereby obtaining a higher sensitivity.

[0048] In the life process of organisms, serum albumin also plays the role of maintaining osmotic pressure, eliminating free radicals and anticoagulation, etc., and accurate determination of its concentration is of great significance. At present, the methods used for analyzing the secondary structure of proteins and denatured proteins include X-ray diffraction, circular dichroism, fluorescence spectroscopy, ultraviolet visible spectroscopy and Fourier transform infrared spectroscopy, but these methods generally have high testing costs, complex data analysis and troublesome sample processing. In order to explain in detail the optical fiber detection structure prepared by the optical fiber quantitative corrosion matrix, device and system of the present invention, the optical fiber detection of bovine serum albumin concentration is taken as an example.

[0049] Reference Figure 6-8 , an optical fiber detection structure for detecting the concentration of bovine serum albumin, comprising a third single-mode optical fiber 31, a first gradient-index optical fiber 34, a side-hole suspended core optical fiber 32, a second gradient-index optical fiber 35 and a fourth single-mode optical fiber 33 which are fused in sequence, the side-hole suspended core optical fiber 32 comprising a main core 321, a side core 322 and a main cladding 323, the main cladding 323 is coated on the outside of the main core 321, the opening is located in the main cladding 323 and extends from the side wall toward the main core 321.

[0050] In the specific detection process, first, the coherent light is injected from the third single-mode optical fiber 31 into the corroded side-hole suspension core optical fiber 32 via the first gradient refractive index optical fiber 34. The first gradient refractive index optical fiber 34 plays a role of collimation and divergence, and forms three-beam interference at the end of the side-hole suspension core optical fiber 32. Then, the light is collected by the fourth single-mode optical fiber 33 after passing through the second gradient refractive index optical fiber 35. The refractive index of bovine serum albumin solutions with different concentrations is different, which affects the position of the three-beam interference peak. The concentration of bovine serum albumin is monitored after demodulating the movement of the resonance peak in the spectrum.

[0051] In the specific selection of optical fiber, the outer diameters of the single-mode optical fiber, the graded-index optical fiber and the side-hole suspension core optical fiber are equal, and the outer diameter can be 120-130 μm. The first graded-index optical fiber can be cut to a length that is exactly at the 1 / 4 pitch of its period to ensure that the light beam diverges and enters the side core and main cladding of the side-hole suspension core optical fiber. The length of the graded-index optical fiber can be 450 μm. The model of the single-mode optical fiber that can be used is Coning SMF-28.

[0052] The core of the graded refractive index optical fiber may have a diameter of 105 μm, the diameter of the middle core of the side-hole suspended core optical fiber may be 13 μm, the side core may be 13 μm, and the diameter of the side hole may be 45 μm.

[0053] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An optical fiber quantitative corrosion matrix, characterized in that: The corrosion substrate (10) is provided with a corrosion channel (11) for placing a corrosion optical fiber structure, a monitoring channel (13) for placing a monitoring optical fiber structure, and a corrosion liquid inlet channel (12); a corrosion section is provided in the middle of the corrosion channel (11); a monitoring section is provided in the middle of the monitoring channel (13); the corrosion liquid inlet channel (12) comprises an inlet section and two inlet communication sections connected to the inlet section; the two inlet communication sections are respectively connected to the corrosion section and the monitoring section; A hollow optical fiber (22) is provided in the middle of the monitoring optical fiber structure, and the hollow optical fiber (22) is located in the monitoring section; The monitoring optical fiber structure comprises a first single-mode optical fiber (21), a hollow optical fiber (22) and a second single-mode optical fiber (23) which are fused in sequence.

2. The optical fiber quantitative corrosion matrix according to claim 1, characterized in that: A corrosive liquid outlet channel (14) is also provided in the corrosive substrate (10), and the corrosive liquid outlet channel (14) comprises a liquid outlet section and two liquid outlet communication sections connected to the liquid outlet section, and the two liquid outlet communication sections are respectively connected to the corrosive section and the monitoring section.

3. The optical fiber quantitative corrosion matrix according to claim 2, characterized in that: The corrosion channel (11) and the monitoring channel (13) are arranged in parallel, and the corrosion liquid inlet channel (12) and the corrosion liquid outlet channel (14) are located between the two and at both ends of the corrosion section and the monitoring section respectively.

4. The optical fiber quantitative corrosion matrix according to claim 1, characterized in that: The preparation is carried out through the following steps: first, the PDMS solution and the curing agent are prepared in a ratio of 10:1, ultrasonically stirred and then poured into the mold, and cured at a temperature of 70°C.

5. An optical fiber quantitative corrosion detection device, characterized in that: It comprises a monitoring optical fiber structure and an optical fiber quantitative corrosion matrix (10) according to any one of claims 1 to 4, wherein the monitoring optical fiber structure is located in a monitoring channel (13), and a detection part is provided in the middle of the monitoring optical fiber structure, and the detection part is located in the monitoring section.

6. An optical fiber quantitative corrosion system, characterized in that: It comprises the optical fiber quantitative corrosion detection device according to claim 5.

7. The optical fiber quantitative corrosion system according to claim 6, characterized in that: Also includes: A broadband coherent light source (40), a fiber coupler (50) and a spectrometer (60); The optical fiber coupler (50) comprises an incident end, a first output end for connecting to the optical fiber structure to be corroded, and a second output end for connecting to the monitoring optical fiber structure. The broadband coherent light source (40) is connected to the incident end of the optical fiber coupler (50). The spectrometer (60) is used to obtain optical signals of the optical fiber structure to be corroded and the monitoring optical fiber structure.

8. An optical fiber detection structure, characterized in that: It comprises an optical fiber segment corroded by using the optical fiber quantitative corrosion system according to claim 6 or 7.

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