CN117630411B - High-integration vector flow field sensor - Google Patents
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/26—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting optical wave
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P1/00—Details of instruments
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P13/00—Indicating or recording presence, absence, or direction, of movement
- G01P13/0006—Indicating or recording presence, absence, or direction, of movement of fluids or of granulous or powder-like substances
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P13/00—Indicating or recording presence, absence, or direction, of movement
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Abstract
The invention discloses a high-integration vector flow field sensor, which comprises a signal transmitting module, a signal receiving module and a signal processing module; the emission signal module is used for emitting a light source; the receiving module consists of an optical fiber probe and a multi-core optical fiber fan-in fan-out device, and the light source is modulated into an optical signal through the optical fiber probe; the signal processing module is used for converting the optical signal into an electric signal and demodulating the electric signal to obtain a vector flow field sensing result. The outside of the bubble is encapsulated by adopting a metal coating, and an optical system is arranged in the microbubble and is not easily interfered by external salt ions and the like. Under a specific grinding oblique angle, the multi-core single-mode fiber and the ultrathin microbubbles can form a plurality of F-P cavities, flow velocity components in a plurality of directions can be perceived through the measuring points, the flow velocity and the direction of the measuring points are determined by combining vector inversion, and vector measurement of high-integration and high-spatial-resolution flow velocity is realized.
Description
Technical Field
The invention relates to the technical field of optical fiber devices, in particular to a high-integration vector flow field sensor.
Background
The ocean turbulence condition is complex, the current turbulence sensor mainly uses one-dimensional observation, high-precision vector measurement in a multiphase flow field cannot be realized, the information quantity cannot meet the current requirements for ocean turbulence detection, the ocean turbulence sensor mostly uses turbulence pulse pressure to act on a sensitive piezoelectric crystal or a micro-electromechanical system, and the ocean turbulence sensor is limited to piezoelectric effect and piezoresistive effect and is blank in the field of optical fiber sensing. Because the optical fiber sensor has the characteristics of water resistance, high and low temperature resistance, electromagnetic interference resistance and the like, the optical fiber sensor is suitable for being used in complex deep sea electromagnetic environments and severe environments. In addition, the domestic and foreign turbulence probes cannot realize submillimeter size in volume, cannot realize micro-scale turbulence space measurement, and the diameter of a single-mode fiber can reach the micron level. Fiber optic sensors offer natural advantages in terms of the high spatial resolution requirements of turbulent microstructure measurements. For the submillimeter vector sensing of complex multiphase turbulent flow fields, a turbulent flow probe with strong anti-interference capability, high spatial resolution, high sensitivity and small size is needed to be realized.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a high integration vector flow field sensor, which is characterized in that the sensor comprises: the device comprises a transmitting signal module, a receiving signal module and a signal processing module;
The emission signal module is used for emitting a light source;
the receiving module consists of an optical fiber probe and a multi-core optical fiber fan-in fan-out device, and the light source is modulated into an optical signal through the probe;
The signal processing module is used for converting the optical signal into an electric signal and demodulating the electric signal to obtain a vector flow field sensing result.
Optionally, the transmitting signal module provides a light source signal, and the light source signal is transferred to the receiving signal module through the optical fiber loop device.
Optionally, the signal receiving module is composed of an optical fiber probe and the fan-in fan-out device, and the optical fiber probe is a multi-core optical fiber Fabry-Perot sensor.
Optionally, the multi-core fiber Fabry-Perot sensor comprises a multi-core single mode fiber, a fiber microbubble and an F-P cavity;
the multi-core single-mode optical fiber is embedded into the optical fiber microbubble;
the beam energy in the multi-core single mode fiber enters the fiber core of the multi-core single mode fiber through the fiber coupling device;
grinding the multi-core single-mode fiber cores into preset oblique angles;
the light energy of the multi-core single-mode fiber core is reflected to the oblique angle end face of the symmetrical edge to form first beam interference;
The reflected light of the multi-core single-mode fiber core is transmitted to the optical fiber microbubbles to form second beam interference, and an F-P cavity is formed at the microbubbles.
Optionally, the workflow of the multi-core fiber Fabry-Perot sensor includes:
The multi-core fiber Fabry-Perot sensor is used for embedding the multi-core single mode fiber into the fiber microbubbles;
forming four flow velocity measurement points by using the Fabry-Perot interference principle;
And determining the flow velocity and the direction of the measuring points by combining the measuring points of the four flow velocities with vector inversion.
Alternatively, the four flow velocity measurement points are divided into 120 degrees at the axial top and equatorial plane of the fiber-optic microbubble.
Optionally, the multicore single-mode fiber core is grinded at a preset angle through a grinder, and metal coating is performed on a preset inclined end face to form a plurality of F-P cavities.
Optionally, the signal processing module includes a demodulation sub-module and a flow rate obtaining sub-module;
the demodulation submodule is used for demodulating the optical signal;
The flow velocity acquisition submodule is used for obtaining the variable quantity of the cavity length according to the measurement principle of the shearing sensor and the demodulation light signal, so as to realize demodulation of the shearing pressure and obtain the flow velocity.
Compared with the prior art, the invention has the beneficial effects that:
The optical fiber probe is made of ultrathin optical fiber microbubbles and bevel angle ground multi-core single-mode optical fibers. The flow velocity measurement with high integration level, high spatial resolution and high sensitivity can be realized. The optical fiber microbubble is a single-end structure microbubble with the film thickness of 1-2um, so that the sensitivity of the optical fiber probe is improved. In addition, the outside of the bubble is encapsulated by adopting a metal coating, and the optical system is in the microbubble and is not easily interfered by external salt ions and the like. Under a specific grinding oblique angle, the multi-core single-mode fiber and the ultra-thin fiber microbubble can form a plurality of F-P cavities, flow velocity components in a plurality of directions can be perceived through the measuring points, the flow velocity and the direction of the measuring points are determined by combining vector inversion, and vector measurement of high-integration and high-spatial-resolution flow velocity is realized.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the embodiments are briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an application system according to an embodiment of the present invention;
FIG. 2 is a schematic view of a fiber optic probe structure and a top view of the fiber optic probe structure according to an embodiment of the present invention;
FIG. 3 is a schematic view of a polishing oblique angle multi-core single-mode optical fiber according to an embodiment of the present invention;
FIG. 4 is a schematic and top view of an embodiment of the present invention of a fiber optic probe subjected to flow rate impingement;
Reference numerals: the optical fiber comprises a transmitting signal part 1, a receiving signal part 2, a signal processing part 3, an optical fiber probe 4, an oblique angle seven-core single-mode optical fiber 5, and comprises a first fiber core 51, a second fiber core 52, a third fiber core 53, a fourth fiber core 54, a fifth fiber core 55, a sixth fiber core 56, a seventh fiber core 57, an optical fiber microbubble axial top flow velocity point position 511, a flow velocity point position 511', an optical fiber microbubble equatorial plane respectively representing 120 degrees, a flow velocity point position 523', a flow velocity point position 545', a flow velocity point position 567', an optical fiber microbubble 6 and a metal film layer 7.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1
In this embodiment, a high integration vector flow field sensor, the sensor includes: the device comprises a transmitting signal module, a receiving signal module and a signal processing module;
the emission signal module is used for emitting a light source;
The transmitting signal module provides a light source signal, and the light source signal is transmitted to the receiving signal module through the optical fiber loop device.
The receiving signal module is used for modulating the light source into an optical signal and transmitting the optical signal to the signal processing module;
the receiving signal module consists of an optical fiber probe and a multi-core optical fiber fan-in fan-out device, and the probe is a multi-core optical fiber Fabry-Perot sensor.
The multi-core fiber Fabry-Perot sensor comprises a multi-core single mode fiber, a fiber microbubble and an F-P cavity;
the multi-core single-mode optical fiber is embedded into the optical fiber microbubble;
the beam energy in the multi-core single mode fiber enters the fiber core of the multi-core single mode fiber through the fiber coupling device;
grinding the multi-core single-mode fiber cores into preset oblique angles;
the light energy of the multi-core single-mode fiber core is reflected to the oblique angle end face of the symmetrical edge to form first beam interference;
The reflected light of the multi-core single-mode fiber core is transmitted to the optical fiber microbubbles to form second beam interference, and an F-P cavity is formed at the microbubbles.
The workflow of the multi-core fiber Fabry-Perot sensor comprises the following steps:
The multi-core fiber Fabry-Perot sensor is used for embedding the multi-core single mode fiber into the fiber microbubbles;
forming four flow velocity measurement points by using the Fabry-Perot interference principle;
And determining the flow velocity and the direction of the measuring points by combining the measuring points of the four flow velocities with vector inversion.
The four flow velocity measurement points are divided into 120 degrees at the axial top and equatorial plane of the optical fiber microbubble.
The multi-core single-mode fiber is grinded at a preset angle through a grinder, and metal coating is carried out on a preset inclined end face to form a plurality of F-P cavities.
The multi-core fiber Fabry-Perot sensor is characterized in that a multi-core single-mode fiber is embedded into a fiber microbubble, four flow velocity measuring points are formed by utilizing the Fabry-Perot interference principle, the four flow velocity measuring points (respectively positioned at the axial top of the microbubble and 120 degrees of the equatorial plane) are formed, and the flow velocity and the direction of the measuring points are determined by combining vector inversion.
The principle of F-P mode formation of the flow velocity measuring point at the axial top of the microbubble is that incident light is incident on a multi-core single-mode fiber core, the end face of the multi-core single-mode fiber is strictly parallel to the end face of the optical fiber microbubble, the reflected light is emitted at the end face of the optical fiber microbubble, and the incident light of the reflected light and the fiber core meet to form light wave interference.
The optical fiber microbubbles are optionally prepared into optical fiber microbubbles with single-end structures and optical fiber microbubbles with double-end structures. Particularly, the single-end structure optical fiber microbubbles have larger regulation space in the aspect of film thickness uniformity and mode characteristic control, and are easier to realize high integration.
Optical fiber microbubbles. The preparation method of the single-end structure optical fiber microbubble comprises the steps of optionally performing expansion-assisted arc discharge, melting hydrogen flame and melting CO 2 by laser. According to the intensity and the discharge time of arc discharge, the distribution of an arc field, the discharge step, the driving force of a motor, the position angle of a microcavity and the like, single-end structure microbubbles with the film thickness of 1-2um magnitude are designed. Because the extremely thin fiber microbubble film layer makes it very sensitive to flow parameters as well.
The principle of forming flow velocity points at 120 degrees of equatorial planes is that incident light is ground by oblique angles from the second fiber core 52 with single mode, the beam energy of the second fiber core 52 is reflected to enter the oblique angle end face of the third fiber core 53 with symmetrical edges, 90 degrees is formed between the beam energy of the second fiber core 52 and the oblique angle end face, the reflected beam returns to the second fiber core 52, the transmitted light enters the optical fiber microbubble 6, the flow velocity can lead to deformation of the film layer of the optical fiber microbubble, the length of the F-P cavity is deformed, and the interference light wave is changed.
The signal processing module is used for converting the optical signal into an electric signal and demodulating the electric signal.
The signal processing module comprises a photoelectric detector, an A/D data acquisition unit and a microprocessor. The photoelectric detector receives the optical signal collected by the optical fiber loop device and converts the optical signal into an analog signal, the A/D data collection unit converts the analog signal converted by the photoelectric detector into a digital signal, and the digital signal is demodulated by the microprocessor, so that a flow velocity result is finally displayed.
According to the measurement principle of the shearing sensor and the demodulation signal, the variable quantity of the cavity length is obtained, the demodulation of the shearing pressure is realized, and a flow velocity formula is obtained:
PE＝ρAwu。
Where ρ is the fluid density, A is the probe axis cross-sectional area, w is the relative velocity of the sensor and the fluid along the probe axis direction, and u is the fluid pulsation velocity in the probe shearing direction.
Example two
The emission signal module is used for emitting a light source;
The transmitting signal module provides a light source signal, and the light source signal is transmitted to the receiving signal module through the optical fiber loop device.
The receiving signal module is used for modulating the light source into an optical signal and transmitting the optical signal to the signal processing module;
The receiving signal module consists of a multi-core fiber fan-in fan-out device and a fiber probe (a multi-core fiber Fabry-Perot sensor), wherein the multi-core fiber Fabry-Perot sensor is an F-P type light sensor. Including multi-core single mode optical fibers and fiber microbubbles 6 and F-P cavities.
The F-P cavity is used for calculating the flow field change through the cavity length change amount when the flow field is changed.
The multi-core single-mode optical fiber comprises four cores single-mode optical fibers and seven-core single-mode optical fibers, preferably, a heptacore single mode optical fiber. The method comprises the steps of forming four flow velocity measuring points by using the Fabry-Perot interference principle, forming four flow velocity measuring points (respectively positioned at the axial top of the microbubble and 120 degrees of the equatorial plane), and determining the flow velocity and the direction of the measuring points by combining vector inversion. When the probe is placed in an underwater flow velocity field, the flow velocity can lead to deformation of the film layer, flow velocity components in four directions can be perceived through the measuring points, and the flow velocity and the direction of the measuring points can be determined by combining vector inversion.
The outer diameter of the multi-core single-mode fiber is 125-140um, and preferably, the outer diameter of the multi-core single-mode fiber is 125um.
The fiber core of the multi-core single-mode fiber is ground at a specific angle through a grinder, and a specific inclined end face is subjected to metal coating to improve the reflection efficiency, so that the change amount of the FP cavity is improved.
The optical fiber microbubbles can be divided into ellipses and circles. Preferably, the circular microbubbles form four measuring points of flow velocity by using the Fabry-Perot interference principle, thereby improving the accuracy of measuring the flow velocity and the azimuth of different dimensions.
The outer diameter of the optical fiber microbubble is 125-1000um, preferably, the outer diameter of the optical fiber microbubble 6 is 300-350um, and because the oblique angle seven-core single mode optical fiber 5 is embedded into the ultrathin microbubble and a plurality of flow velocity measuring points are formed by using the Fabry-Perot interference principle, the outer diameter of the optical fiber microbubble 6 is required to be larger than the outer diameter of the multi-core single mode optical fiber.
In this embodiment, the sensor includes three parts, namely, transmitting signals, receiving signals and signal processing.
Fig. 1 is a schematic diagram of a system for implementing the present invention. The optical fiber probe comprises a transmitting signal part 1, a receiving signal part 2 and a signal processing part 3, wherein the transmitting signal part is used for providing a light source signal part, and the light source signal part passes through an optical fiber circulator and a fan-in fan-out device to the optical fiber probe.
The received signal portion 2 includes a multi-core fiber fan-in and fan-out device and a multi-core fiber Fabry-Perot sensor (fiber probe), as shown in fig. 2, which is a schematic diagram of a fiber probe structure according to an embodiment of the present invention.
In this embodiment, a seven-core single-mode optical fiber 5 and an optical fiber microbubble 6 are specifically described as examples. The oblique angle seven-core single-mode fiber 5 is embedded into an ultrathin optical fiber microbubble, and after the first fiber core enters the end face of the oblique angle seven-core single-mode fiber 5, an F-P cavity is formed between the end face and the axial top flow velocity point position 511 of the microbubble. The light beam energy in the second fiber core 52 of the oblique angle seven-core single-mode fiber 5 enters the second fiber core 52 through the optical fiber coupling device, the second fiber core 52 is ground into a specific oblique angle through the grinder, the light beam energy of the second fiber core 52 is reflected to the oblique angle end face of the third fiber core 53 with symmetrical edges, the reflected light of the second fiber core 52 forms 90 degrees with the oblique angle end face of the third fiber core 53, the first light beam interference is formed by the reflected light of the second fiber core 52 and the reflected light of the second fiber core 52, the reflected light of the second fiber core 52 is transmitted to the micro bubble position, namely, the flow velocity point position 523 at 120 degrees is formed at the equatorial plane through the oblique angle end face of the third fiber core 53, when the micro bubble film is placed in an underwater flow velocity field, the flow velocity can lead to deformation of the micro bubble film laminar flow velocity point position 523, the second light beam interference is formed with the incident light of the second fiber core 52, and an F-P cavity is formed at the first flow velocity point position 523 at the equatorial plane of the micro bubble. Similarly, the fourth and fifth cores 54, 55 form an F-P cavity at a second flow point location 545 on the equatorial plane of the microbubble, and the sixth and seventh cores 56, 57 form an FP cavity at a third flow point location 567 on the equatorial plane of the microbubble. The light beam reflected by the outer wall of the micro-bubble cavity can be ignored because of the ultra-thin micro-bubble. At this time, the optical fiber with the oblique angle end face is embedded into the spherical film microcavity, so that two light beams can interfere. The interference spectrum can be expressed as:
Wherein, the light intensity I r in the cavity represents the light intensity in the F-P cavity, R 1 and R 2 respectively represent the reflectances of two reflecting surfaces of the inner wall of the F-P, eta represents the transmittance of the inner wall of the F-P cavity when the light is reflected for many times in the cavity, n eff represents the equivalent refractive index of the substance in the F-P cavity, L represents the distance between the reflecting walls of the F-P cavity, The initial phase of the F-P interference is shown, and λ is the wavelength of the resonance front of the F-P interferometer.
Fig. 3 is a schematic structural diagram of a seven-core optical fiber after being ground by an optical fiber grinder, wherein the outer diameter is 125um, the seven-core optical fiber is composed of seven optical fibers with core diameters of 8-8.5um, the grinding angles of the second optical fiber core 52 and the third optical fiber core 53 on the opposite side meet θ 3＝90°,2θ1+θ2 =270°, θ 1＝arcsin(nm/nf),nm is the effective refractive index of the microcavity, and n f is the effective refractive index of the fundamental mode of the multi-core single-mode optical fiber. The method is characterized in that a finite element analysis method is combined to calculate the corresponding effective refractive index, then the grinding angle is designed, and the multi-core single-mode optical fiber is subjected to rough grinding, medium grinding, fine grinding and arc polishing by combining with an experimental grinder device to prepare the required multi-core single-mode optical fiber. It is noted that, in order to increase the reflectance, a highly reflective metal film layer 7 is plated at the end face. Meanwhile, the outside of the micro-bubble is encapsulated by adopting the metal coating layer 7, and the optical system is arranged in the micro-bubble and is not interfered by external salt ions and the like.
FIG. 4 shows a schematic view of the flow velocity impact received by the fiber probe structure according to the present invention, when the water flow impacts, the axial top position 511 of the fiber microbubble changes to 511', the cavity length change amount is L511, the equatorial plane of the fiber microbubble is 120 degrees, the position 523 changes to 523', the cavity length change amount is L23, the fiber microbubble position 545 changes to 545', the cavity length change amount is L45, and the fiber microbubble position 567 changes to 567', and the cavity length change amount is L67. When the optical fiber probe 4 is placed in an underwater flow velocity field, the flow velocity can lead to deformation of the membrane layer, and because the microcavity is ultrathin, when pressure acts on the surface of the outer wall of the microbubble, the membrane deforms, and the deformation amount is as follows:
Wherein DeltaL is the deformation of the microcavity, R is the radius of the spherical microcavity, R is the distance from the end face of the optical fiber to the center of the microcavity, P E is the external Reynolds stress of the microcavity, P l is the internal pressure of the microcavity, t is the thickness of the microcavity, E and v are Young's modulus and Poisson's ratio respectively, and the two parameters are related to the material of the microcavity and are constants. When the flow field impacts the probe, the wall of the spherical microcavity is deformed at the moment t, so that the cavity length L 1,L2,L3 of the Fabry-Perot interference cavity is changed, and a flow rate formula is calculated according to the Lagrangian method:
When the flow field impacts the probe, the spherical microcavity wall is deformed at the moment t, so that the cavity length L 11,L23,L45 of the Fabry-Perot interference cavity is changed. If a fluid particle is determined, its displacement is observed at all times. The initial sitting marks of flow velocity points on the axial top part of the microbubble and any two equatorial planes are a, b and c, and the position coordinates of the particles at the moment t are expressed as follows:
calculating a flow rate formula according to the Lagrangian method:
According to the measurement principle of the shearing sensor and by demodulating the optical signal, the variable quantity of the cavity length can be obtained, so that the demodulation of the shearing pressure is realized, and finally, a flow velocity formula is obtained:
PE＝ρAwu
ρ is the fluid density, A is the probe axis cross-sectional area, w is the relative velocity of the sensor and the fluid along the probe axis direction, and u is the fluid pulsation velocity in the probe shear direction.
The above embodiments are merely illustrative of the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but various modifications and improvements made by those skilled in the art to which the present invention pertains are made without departing from the spirit of the present invention, and all modifications and improvements fall within the scope of the present invention as defined in the appended claims.
Claims (6)
1. A high integration vector flow field sensor, the sensor comprising: the device comprises a transmitting signal module, a receiving signal module and a signal processing module;
The emission signal module is used for emitting a light source;
the receiving signal module consists of an optical fiber probe and a multi-core optical fiber fan-in fan-out device, and the light source is modulated into an optical signal through the optical fiber probe; the optical fiber probe is a multi-core optical fiber Fabry-Perot sensor;
the multi-core fiber Fabry-Perot sensor comprises a multi-core single mode fiber, a fiber microbubble and an F-P cavity;
the multi-core single-mode optical fiber is embedded into the optical fiber microbubble;
the beam energy in the multi-core single mode fiber enters the fiber core of the multi-core single mode fiber through the fiber coupling device;
grinding the multi-core single-mode fiber cores into preset oblique angles;
the light energy of the multi-core single-mode fiber core is reflected to the oblique angle end face of the symmetrical edge to form first beam interference;
The reflected light of the multi-core single-mode fiber core is transmitted to the optical fiber microbubbles to form second beam interference, and an F-P cavity is formed at the microbubbles;
The signal processing module is used for converting the optical signal into an electric signal and demodulating the electric signal to obtain a vector flow field induction result;
When pressure acts on the surface of the outer wall of the micro-bubble, the micro-cavity deforms, and the deformation amount is as follows:
Wherein DeltaL is the deformation of the microcavity, R is the radius of the spherical microcavity, R is the distance from the end face of the optical fiber to the center of the microcavity, P E is the external Reynolds stress of the microcavity, P l is the internal pressure of the microcavity, t is the thickness of the microcavity, and E and v are the Young's modulus and Poisson's ratio respectively;
According to the measurement principle of the shearing sensor and by demodulating the optical signals, the micro-cavity deformation can be obtained, so that the demodulation of the shearing pressure is realized:
PE＝ρAwu
ρ is the fluid density, A is the cross-sectional area of the fiber probe axis, w is the relative velocity of the sensor and the fluid along the fiber probe axis, and u is the fluid pulsation velocity in the fiber probe shearing direction.
2. The high integration vector flow field sensor of claim 1, wherein: the transmitting signal module provides a light source signal, and the light source signal is transmitted to the receiving signal module through the optical fiber loop device.
3. The high integration vector flow field sensor of claim 1, wherein the workflow of the multi-core fiber Fabry-Perot sensor comprises:
The multi-core fiber Fabry-Perot sensor is used for embedding the multi-core single mode fiber into the fiber microbubbles;
forming four flow velocity measurement points by using the Fabry-Perot interference principle;
And determining the flow velocity and the direction of the measuring points by combining the measuring points of the four flow velocities with vector inversion.
4. The high integration vector flow field sensor of claim 1, wherein the four flow velocity measurement points are separated at 120 degrees each at the axial top of the fiber microbubble.
5. The high-integration vector flow field sensor according to claim 1, wherein the multicore single-mode fiber core is ground at a preset angle through a grinder, and a preset inclined end face is subjected to metal coating to form a plurality of F-P cavities.
6. The high integration vector flow field sensor of claim 1, wherein the signal processing module comprises a demodulation sub-module and a flow rate acquisition sub-module;
the demodulation submodule is used for demodulating the optical signal;
The flow velocity acquisition submodule is used for obtaining the variable quantity of the cavity length according to the measurement principle of the shearing sensor and the demodulation light signal, so as to realize demodulation of the shearing pressure and obtain the flow velocity.
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