A fabry-perot interference microfluidic sensing detection device integrated with a full-suspended core optical fiber

Abstract

The utility model provides a kind of F-P interference microfluid sensing detection device of full-suspension core optical fiber integration, including wideband light source and the coupler of signal connection, coupler is signal connected to No. one circulator and No. two circulators respectively, No. two circulators are also signal connected to No. two spectrometer and fan in fan out module respectively;No. one circulator is signal connected to No. one spectrometer and fan in fan out module respectively, the output end signal connection of fan in fan out module is used to pass through the F-P interference microfluid cavity structure of light beam and liquid to be measured, the F-P interference microfluid cavity structure is equipped with two liquid inlets and two liquid outlets, and each liquid inlet is communicated with a liquid outlet to form micropore channel, each liquid inlet is connected with a microfluid pump pipeline, and each liquid outlet is connected with a waste liquid pool pipeline.The utility model structure is highly integrated, can detect two kinds of liquid in parallel, improve work efficiency, the micropore channel of the setting of double-hole optical fiber, so that the amount of sample to be measured is very little to complete test.

Description

Technical Field

[0001] This invention belongs to the field of fiber optic sensing and microfluidics technology, and in particular relates to a Fabry-Perot interferometric microfluidic sensing and detection device integrated with a fully suspended fiber. Background Technology

[0002] Fabry-Perot interferometers are widely used for sensing and measuring physicochemical parameters such as temperature, pressure, refractive index, and concentration due to their high sensitivity, fast response, and compact structure. In the field of biochemical detection, combining Fabry-Perot interferometers with microfluidic chips to achieve in-situ, real-time detection of trace liquids has become a research hotspot. Existing fiber-optic Fabry-Perot microfluidic sensors often construct the Fabry-Perot cavity by etching microcavities on the fiber end face, bonding silicon wafers, or splicing hollow optical fibers. These methods have some inherent drawbacks: poor structural stability: heterogeneous structures formed by bonding or fusion are prone to detachment or failure during long-term use in liquid environments, resulting in low reliability. Complex fabrication process: precise alignment and complex post-processing are required, leading to high manufacturing costs and difficulty in ensuring repeatability. Limited sensitivity: the mode field energy of traditional single-mode optical fibers is mainly concentrated inside the fiber core, limiting interaction with the liquid being measured in the flow channel and restricting further improvement in sensing sensitivity. Low integration: the sensing unit and microfluidic channel are usually discrete structures, resulting in a large device size, which is not conducive to portable and array-based detection. Therefore, there is an urgent need for a microflow sensing solution that is structurally stable, simple to prepare, highly sensitive, and easy to integrate. Utility Model Content

[0003] In view of this, the present invention aims to propose a Fabry-Perot interferometric microfluidic sensing detection device integrated with a fully suspended fiber to solve at least one of the above-mentioned problems. The present invention highly integrates a broadband light source, coupler, circulator, spectrometer, fan-in fan-out module and Fabry-Perot interferometric microfluidic cavity structure, which can detect two liquids in parallel, improves working efficiency, reduces equipment cost and reduces the footprint. Moreover, the device can be operated by one person, thereby reducing labor costs. The micro-pore channel set in the dual-hole fiber allows the test to be completed with a very small amount of sample, thereby saving raw material costs.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A Fabry-Perot interferometric microfluidic sensing device integrated with a fully suspended fiber includes a broadband light source and a coupler for signal connection. The coupler is signal-connected to a first circulator and a second circulator. The second circulator is also signal-connected to a second spectrometer and a fan-in / fan-out module. The first circulator is signal-connected to the first spectrometer and the fan-in / fan-out module. The output of the fan-in / fan-out module is signal-connected to a Fabry-Perot interferometric microfluidic cavity structure for passing the light beam and the liquid to be tested. The Fabry-Perot interferometric microfluidic cavity structure has two inlets and two outlets, and each inlet is connected to an outlet to form a micropore channel. Each inlet is connected to a microfluidic pump pipeline, and each outlet is connected to a waste liquid pool pipeline.

[0005] Furthermore, the Fabry-Perot interferometric microfluidic cavity structure includes a suspended-core fiber, a dual-hole fiber, and a tapered fiber fused together in sequence. The suspended-core fiber and the dual-hole fiber are fused together to form a first reflective surface, and the dual-hole fiber and the tapered fiber are fused together to form a second reflective surface. The middle and end of the dual-hole fiber are respectively provided with a liquid inlet and a liquid outlet.

[0006] Furthermore, the suspended-core optical fiber has a hollow cylindrical structure, with a first suspended-core fiber core and a second suspended-core fiber core symmetrically installed on the hollow inner wall. The dual-hole optical fiber includes a first micro-pore channel for fusion splicing with the first suspended-core fiber core and a second micro-pore channel for fusion splicing with the second suspended-core fiber core, and the inner diameter of the first suspended-core fiber core is larger than the inner diameter of the first micro-pore channel. The tapered optical fiber includes a tapered fiber core. After the tapered fiber core is fused with the dual-hole optical fiber, the first micro-pore channel forms a first liquid outlet at the second reflective surface, and the second micro-pore channel forms a second liquid outlet at the second reflective surface. A first liquid inlet is provided in the middle of the first micro-pore channel, and a second liquid inlet is provided in the middle of the second micro-pore channel. The first liquid inlet and the second liquid inlet are respectively connected to a first microfluidic pump and a second microfluidic pump through pipelines. Both the first liquid outlet and the second liquid outlet are connected to a waste liquid tank through pipelines.

[0007] Furthermore, the outer diameters of the suspended-core optical fiber and the dual-hole optical fiber are the same.

[0008] Furthermore, the suspended fiber has a length of 150 micrometers, an outer diameter of 125 micrometers, a hollow inner diameter of 90 micrometers, and the diameters of the first and second suspended fiber cores are both 9 micrometers. The two fiber cores are symmetrical about the suspended fiber axis, and the center distance between the first and second suspended fiber cores is 81 micrometers.

[0009] Furthermore, the dual-hole fiber has a length of 150 micrometers, an outer diameter of 125 micrometers, an inner diameter of 8 micrometers for each micro-hole channel, and the two micro-hole channels are symmetrical about the dual-hole fiber axis with a center distance of 82 micrometers.

[0010] Furthermore, the dual-hole optical fiber is a one-piece molded structure.

[0011] Furthermore, the tapered optical fiber has a length of 5 cm and an outer diameter of 86 micrometers for the tapered core.

[0012] Furthermore, the broadband light source is an NKT Photonics SuperK Extreme supercontinuum fiber laser.

[0013] Furthermore, the fan-in / fan-out module is model MCFIFOM.

[0014] Compared with existing technologies, the Fabry-Perot interferometric microcurrent sensing detection device integrated with a fully suspended fiber described in this invention has the following advantages: (1) This utility model integrates a broadband light source, coupler, circulator, spectrometer, fan-in fan-out module and Fabry interferometer microfluidic cavity structure, which can detect two liquids in parallel, improve work efficiency, reduce equipment cost and reduce floor space; moreover, this device can be operated by one person, thereby reducing labor costs. The micro-pore channel set by the dual-hole optical fiber makes it possible to complete the test with very little sample, thereby saving raw material costs.

[0015] (2) This invention can not only be used to detect the refractive index of liquids, but also to detect specific biomolecules, cells, viruses, etc. by modifying its surface with specific biological probes. It has broad application prospects in fields such as biochemical analysis, environmental monitoring, and medical diagnosis. Attached Figure Description

[0016] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 This is a schematic diagram of the structure of the Fabry-Perot interferometric microcurrent sensing and detection device integrated with a fully suspended fiber optic cable as described in this embodiment of the present invention. Figure 2 This is a schematic diagram of the Fabry-Perot interference microfluidic cavity structure described in an embodiment of the present invention; Figure 3 This is a schematic diagram illustrating the working principle of the Fabry-Perot interferometric microcurrent sensing and detection device integrated with a fully suspended fiber optic cable as described in this embodiment of the invention.

[0017] Explanation of reference numerals in the attached figures: 1-Suspended fiber; 11-Hollow core; 12-First suspended fiber core; 13-Second suspended fiber core; 2-Dual-hole fiber; 21-First micro-pore channel; 22-Second micro-pore channel; 3-Tapered fiber; 31-Tapered fiber core; 4-Inlet No. 1; 5-Inlet No. 2; 6-Outlet No. 1; 7-Outlet No. 2; 8-Spectrometer No. 1; 9-Spectrometer No. 2; 10-Fan-in / Fan-out module; 11-First reflecting surface; 12-Second reflecting surface; 13-Coupled; 14-Circulator No. 1; 15-Circulator No. 2; 16-Broadband light source; 17-First microfluidic pump; 18-Second microfluidic pump; 19-Waste liquid tank; A: Light A signal entry and reflection path; B: Light B signal entry and reflection path; C: Flow path of test liquid 1; D: Flow path of test liquid 2. Detailed Implementation

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[0019] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] In existing technologies, when testing multiple liquids, one test must be completed before the next can be performed, significantly reducing testing efficiency. Sometimes, to improve efficiency, multiple testing devices are used simultaneously. However, multiple devices not only increase the overall equipment cost and occupy a large area, but also require one person for each device, increasing labor costs. The Fabry-Perot interferometric microfluidic sensing detection device integrated with a fully suspended fiber optic cable of this invention can detect two liquids in parallel. Compared to existing technologies that use two testing devices, this significantly reduces equipment cost and floor space. Furthermore, this device can be operated by one person, further reducing labor costs.

[0023] A Fabry-Perot interferometric microcurrent sensing and detection device integrated with an all-suspension-core optical fiber, such as Figures 1 to 3 As shown, the system includes a broadband light source 16 and a coupler 13 for signal connection. Coupler 13 is connected to a first circulator 14 and a second circulator 15. The second circulator 15 is also connected to a second spectrometer 9 and a fan-in / fan-out module 10. The first circulator 14 is connected to a first spectrometer 8 and a fan-in / fan-out module 10. The output of the fan-in / fan-out module 10 is connected to a Fabry-Perot interference microfluidic cavity structure for passing the light beam and the liquid to be tested. The Fabry-Perot interference microfluidic cavity structure has two inlets and two outlets, and each inlet is connected to an outlet to form a micropore channel. Each inlet is connected to a microfluidic pump pipeline (plastic hose), and each outlet is connected to a waste liquid pool 19 pipeline (plastic hose).

[0024] In some embodiments, the Fabry-Perot interferometric microfluidic cavity structure includes a suspended-core fiber 1, a dual-hole fiber 2, and a tapered fiber 3 fused together in sequence. The suspended-core fiber 1 and the dual-hole fiber 2 are fused together to form a first reflective surface 11, and the dual-hole fiber 2 and the tapered fiber 3 are fused together to form a second reflective surface 12. The middle and end of the dual-hole fiber 2 are respectively provided with a liquid inlet and a liquid outlet.

[0025] In some embodiments, the suspended fiber 1 is a hollow cylindrical structure. A first suspended fiber core 12 and a second suspended fiber core 13 are symmetrically mounted (bonded to the sheath wall by a filler) on the inner wall of the hollow core 11. The dual-hole fiber 2 includes a first micro-channel 21 for fusion splicing with the first suspended fiber core 12 and a second micro-channel 22 for fusion splicing with the second suspended fiber core 13. The inner diameter of the first suspended fiber core 12 is larger than the inner diameter of the first micro-channel 21, ensuring that after the micro-channels and the suspended fiber cores are fused, the liquid to be tested will not flow into the hollow core 11 of the suspended fiber, thus preventing interference. The tapered optical fiber 3 includes a tapered fiber core 31. After the tapered fiber core 31 is fused with the dual-hole optical fiber 2, the first micro-hole channel 21 forms a first liquid outlet 6 at the second reflective surface 12, and the second micro-hole channel 22 forms a second liquid outlet 7 at the second reflective surface 12. The first micro-hole channel 21 is provided with a first liquid inlet 4 in the middle, and the second micro-hole channel 22 is provided with a second liquid inlet 5 in the middle. The first liquid inlet 4 and the second liquid inlet 5 are respectively connected to a first microfluidic pump 17 and a second microfluidic pump 18 through pipelines. The first liquid outlet 6 and the second liquid outlet 7 are both connected to a waste liquid tank 19 through pipelines.

[0026] In some embodiments, the outer diameters of the suspended fiber 1 and the dual-hole fiber 2 are the same, which can ensure seamless splicing between the two.

[0027] In some embodiments, the suspended fiber 1 has a length of 150 micrometers, an outer diameter of 125 micrometers, an inner diameter of 90 micrometers for the hollow core 11, and the diameters of the first suspended core 12 and the second suspended core 13 are both 9 micrometers. The two cores are axially symmetrical about the suspended fiber 1, and the center-to-center distance between the first suspended core 12 and the second suspended core 13 is 81 micrometers. The 125-micrometer outer diameter allows the suspended fiber 1 to directly use conventional fiber optic clamps and connectors, greatly simplifying system integration and packaging. The axial symmetry of the two cores and the approximately 80-micrometer distance between their centers ensure that the two incoming light beams A and B can be transmitted without interference.

[0028] In some embodiments, the dual-hole optical fiber 2 is an integrally formed structure.

[0029] In some embodiments, the dual-hole fiber 2 has a length of 150 micrometers, an outer diameter of 125 micrometers, and an inner diameter of 8 micrometers for each micro-channel. The first micro-channel 21 and the second micro-channel 22 are axially symmetrical about the dual-hole fiber 2, with a center-to-center distance of 82 micrometers. Its outer diameter is consistent with that of the suspended-core fiber, enabling seamless splicing. During splicing, the two micro-channels of the dual-hole fiber are aligned and fused with the two cores of the suspended-core fiber. The inner diameter of the micro-channels is smaller than the core diameter of the suspended-core fiber, forming a first reflective surface while ensuring that the liquid to be tested does not flow into the hollow core of the suspended-core fiber, thus preventing interference.

[0030] In some embodiments, the tapered fiber 3 is made by heating and stretching a single-mode fiber with a length of 10 cm, an outer diameter of 125 μm, and a core diameter of 90 μm, to make the local area of ​​the single-mode fiber thinner and then cutting it. The resulting tapered fiber 3 is about 5 cm long and the diameter of the tapered core 31 is about 86 μm, so that it can be fused with the dual-hole fiber 2 to form the second reflecting surface 9 of the Fabry-Perot interference microfluidic cavity.

[0031] The signal connections between the broadband light source 16, coupler 13, circulator 14, circulator 15, spectrometer 9, spectrometer 8, fan-in fan-out module 10, and Fabry-Perot interferometer microfluidic cavity structure are all via single-mode fiber optic signal connections. Since all of the above devices are existing devices, the signal connection methods between the devices are all existing technologies.

[0032] In some embodiments, the broadband light source 16 is a Danish NKT Photonics SuperKExtreme supercontinuum fiber laser, which improves data quality and reduces long-term maintenance costs by simplifying the experimental optical path.

[0033] In some embodiments, both spectrometer 9 and spectrometer 8 are Yokogawa AQ6370D spectrometers, providing dynamic range, wavelength accuracy, and sensitivity for the telecommunications band.

[0034] In some embodiments, the fan-in / fan-out module 10 is of model MCFIFOM, which integrates multiple independent, error-prone single-core fiber connections into a reliable, factory-calibrated modular connection, greatly improving the reliability of the system.

[0035] In some embodiments, the first circulator 14 and the second circulator 15 are both model Thorlabs 6015-3-APC.

[0036] In some embodiments, the coupler 13 is a Thorlabs TW1550R5F1.

[0037] In some embodiments, the first microfluidic pump 17 and the second microfluidic pump 18 are both Lange LSP01-2A integrated syringe pumps, which can precisely control the push and pull of liquids at submicro- or even nano-levels, ensuring that the sample can completely and smoothly fill the cavity without causing leakage or damage to the sensitive optical interface due to excessive flushing.

[0038] The working principle of a Fabry-Perot interferometric microcurrent sensing device integrated with a fully suspended fiber is as follows: The light emitted by the broadband light source 16 first enters the coupler 13, which evenly distributes the light to the two ports to form two beams. These two beams enter the first circulator 14 and the second circulator 15 respectively and then exit. The exited light enters the fan-in and fan-out modules 10 through the single-mode fiber. The two fiber cores in the fan-in and fan-out modules 10 are aligned with the first suspended fiber core 12 and the second suspended fiber core 13 of the suspended fiber 1, forming two independent optical channels. The two optical channels propagate two independent beams of light: light A and light B. Light A and light B enter the first suspended fiber core 12 and the second suspended fiber core 13 of the suspended fiber 1 respectively. Light A enters the first core 12 of the suspended fiber and propagates to the first reflecting surface 11. At the first reflecting surface, light A is split into two parts: part A1 and part A2. Part A1 is reflected back to the first core 12 of the suspended fiber by the first reflecting surface 11. Part A2 passes through the first reflecting surface 11 and continues to propagate to the right, reaching the second reflecting surface 12. At this interface, light A2 is split into two parts: part A21 and part A22. Part A21 is reflected back to the first micro-aperture channel 21 of the dual-aperture fiber 2 by the second reflecting surface 12. Part A22 passes through the second reflecting surface and continues to propagate to the right. Since the tapered fiber 3 is long enough, part A22 will be completely attenuated during its propagation to the right, and no interference signal will be generated. Part of the light A21 reflected back to the micro-aperture channel continues to propagate to the left to the first reflecting surface 11. After passing through the first reflecting surface 11, it propagates in the first suspended core 12 of the suspended fiber along with part of the light A1. The two parts of light superimpose, and the superimposed light is denoted as A3. The interference principle of light B is the same as that of light A. After being reflected by the Fabry-Perot cavity, light B produces superimposed light, denoted as B3. Since the two symmetrical cores of the fan-in fan-out module 10 are aligned with the first suspended core 12 and the second suspended core 13 of the suspended fiber 1, light A3 and light B3 respectively enter the two cores of the fan-in fan-out module 10. The fan-out device of the fan-in fan-out module 10 couples these two beams of light into two independent single-mode fibers. Light A3 propagates through the first circulator 14 to the first spectrometer 8 for real-time monitoring, and light B3 propagates through the second circulator 15 to the second spectrometer 9 for real-time monitoring. This allows for the simultaneous detection of parameters such as the refractive index of two different test liquids. When the refractive index of the liquid in the first micropore channel and the second micropore channel 22 changes, it causes a change in the optical path difference. This change directly leads to a shift in the interference fringes in the transmission spectrum. By monitoring and calculating the shift of the fringes in real time using a spectrometer, highly sensitive, real-time measurement of the refractive index change of the liquid under test can be achieved.

[0039] Staff can test the refractive index of one or two liquids as needed. When testing a single liquid, turn on the power to the broadband light source 16, coupler 13, circulator 14, spectrometer 8, and fan-in / fan-out module 10. Then, inject the liquid into the inlet 4 via the first microfluidic pump 17. The liquid then passes through the first microporous channel 21 and is discharged into the waste liquid pool 19 via the outlet 6. When testing two liquids together, turn on the second circulator 5 and the second spectrometer 9 and perform the same operation. The two operations do not interfere with each other, greatly improving the detection efficiency of the liquid.

[0040] The structure of this application can simultaneously test two liquids, exhibiting a high degree of integration, significantly improving testing efficiency and reducing testing costs. The micro-channel configuration of the dual-hole optical fiber allows for testing with very small sample volumes. The fan-in / fan-out module lays the foundation for future arraying of multiple such sensing and detection devices. A single multi-core fiber fan-in / fan-out module can connect multiple such Fabry-Perot interferometric microfluidic cavity structures, enabling parallel detection. This device can not only be used to detect liquid refractive indices but also, by modifying its surface with specific biological probes, can be used to detect specific biomolecules, cells, viruses, etc., showing broad application prospects in biochemical analysis, environmental monitoring, and medical diagnostics.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A Fabry-Perot interferometric microcurrent sensing and detection device integrated with an all-suspension-core optical fiber, characterized in that: The system includes a broadband light source and a coupler for signal connection. The coupler is connected to a first circulator and a second circulator. The second circulator is also connected to a second spectrometer and a fan-in / fan-out module. The first circulator is connected to a first spectrometer and a fan-in / fan-out module. The output of the fan-in / fan-out module is connected to a Fabry-Perot interference microfluidic cavity structure for passing the light beam and the liquid to be tested. The Fabry-Perot interference microfluidic cavity structure has two inlets and two outlets, and each inlet is connected to an outlet to form a micropore channel. Each inlet is connected to a microfluidic pump pipeline, and each outlet is connected to a waste liquid pool pipeline.

2. The Fabry-Perot interferometric microcurrent sensing and detection device integrated with an all-suspension-core optical fiber according to claim 1, characterized in that: The Fabry-Perot interferometric microfluidic cavity structure includes a suspended-core fiber, a dual-hole fiber, and a tapered fiber fused together in sequence. The suspended-core fiber and the dual-hole fiber are fused together to form a first reflective surface, and the dual-hole fiber and the tapered fiber are fused together to form a second reflective surface. The middle and end of the dual-hole fiber are respectively provided with a liquid inlet and a liquid outlet.

3. The Fabry-Perot interferometric microcurrent sensing and detection device integrated with an all-suspension-core optical fiber according to claim 1, characterized in that: The suspended-core optical fiber has a hollow cylindrical structure with a first suspended-core fiber core and a second suspended-core fiber core symmetrically installed on the hollow inner wall. The dual-hole optical fiber includes a first micro-hole channel for fusion splicing with the first suspended-core fiber core and a second micro-hole channel for fusion splicing with the second suspended-core fiber core. The inner diameter of the first suspended-core fiber core is larger than the inner diameter of the first micro-hole channel. The tapered optical fiber includes a tapered fiber core. After the tapered fiber core is fused with the dual-hole optical fiber, the first micro-hole channel forms a first liquid outlet at the second reflective surface, and the second micro-hole channel forms a second liquid outlet at the second reflective surface. The first micro-hole channel has a first liquid inlet in the middle, and the second micro-hole channel has a second liquid inlet in the middle. The first liquid inlet and the second liquid inlet are respectively connected to a first microfluidic pump and a second microfluidic pump through pipelines. The first liquid outlet and the second liquid outlet are both connected to a waste liquid tank through pipelines.

4. The Fabry-Perot interferometric microcurrent sensing and detection device integrated with an all-suspension-core optical fiber according to claim 1, characterized in that: Suspended-core optical fibers and dual-hole optical fibers have the same outer diameter.

5. The Fabry-Perot interferometric microcurrent sensing and detection device integrated with an all-suspended fiber optic cable according to claim 1, characterized in that: The suspended fiber has a length of 150 micrometers, an outer diameter of 125 micrometers, a hollow inner diameter of 90 micrometers, and the diameters of the first and second suspended fiber cores are both 9 micrometers. The two fiber cores are symmetrical about the suspended fiber axis, and the center distance between the first and second suspended fiber cores is 81 micrometers.

6. The Fabry-Perot interferometric microcurrent sensing and detection device integrated with an all-suspension-core optical fiber according to claim 2, characterized in that: The dual-hole fiber is 150 micrometers long and has an outer diameter of 125 micrometers. The inner diameter of each micro-hole channel is 8 micrometers, and the two micro-hole channels are symmetrical about the dual-hole fiber axis with a center distance of 82 micrometers.

7. The Fabry-Perot interferometric microcurrent sensing and detection device integrated with an all-suspension-core optical fiber according to claim 1, characterized in that: The dual-hole optical fiber is a one-piece molded structure.

8. The Fabry-Perot interferometric microcurrent sensing and detection device integrated with an all-suspension-core optical fiber according to claim 2, characterized in that: The tapered optical fiber is 5 cm long and the outer diameter of the tapered fiber core is 86 micrometers.

9. The Fabry-Perot interferometric microcurrent sensing and detection device integrated with an all-suspended fiber optic cable according to claim 1, characterized in that: The broadband light source is the NKT Photonics SuperK Extreme supercontinuum fiber laser.

10. The Fabry-Perot interferometric microcurrent sensing and detection device integrated with an all-suspension-core optical fiber according to claim 1, characterized in that: The fan-in / fan-out module is model MCFIFOM.

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