Packaging device and method for fiber grating cardiopulmonary vibration sensor

Abstract

The invention relates to a packaging device and method for a fiber bragg grating heart-lung vibration sensor, the device is used for packaging a fiber bragg grating vibration sensing head, the sensing head comprises a fiber bragg grating, and the device comprises a fiber bragg grating tensioning module, a vibration diaphragm packaging module, a fiber bragg grating positioning module and a base. The fiber bragg grating tensioning module and the fiber bragg grating positioning module are installed on the base, the vibrating diaphragm packaging module is installed on the fiber bragg grating positioning module, the sensing head is placed on the vibrating diaphragm packaging module, and a fiber bragg grating of the sensing head sequentially passes through the vibrating diaphragm packaging module, the fiber bragg grating positioning module and the fiber bragg grating tensioning module. And the positioning of the fiber bragg grating is completed, then glue injection is carried out on the fiber bragg grating, packaging is completed, and the process is achieved through the method. When the fiber bragg grating is positioned, the fiber bragg grating is pre-stretched and pre-positioned through the fiber bragg grating positioning module, the pulling process is soft, the fiber bragg grating is not prone to breakage, and final positioning and fixing are completed through the fiber bragg grating tensioning module.

Description

Technical Field

[0001] The present invention relates to the technical field of sensor packaging, and in particular to a packaging device and method for a fiber grating cardiopulmonary vibration sensor. Background Art

[0002] Cardiovascular diseases seriously affect human health, and respiration and heart rate are important physiological parameter indicators that directly reflect human health. Low-frequency physiological dynamic signals in the chest and abdomen caused by breathing and heartbeat occur all the time in the human body. Heartbeat signals are often accompanied by respiratory rates, and cardiopulmonary dynamic signals are easily interfered by environmental noise. Currently commonly used contact detection methods, such as electrocardiographs, integrated monitors, wearables, etc., require electrodes or sensors to directly or indirectly contact the human body, which may cause cross-infection of contact-transmitted diseases and have certain application limitations. In order to reduce the risk, a non-contact real-time monitoring method is needed to meet the needs of home cardiopulmonary health testing, which is very useful for predictive evaluation of some lung diseases and cardiovascular diseases.

[0003] Since optical fibers are fragile and easy to break, batch production is cumbersome, and the existing production method is manual production, the measurement accuracy, repeatability and consistency of fiber grating sensors are poor. In order to protect the fiber grating from damage during use and improve the measurement range and reliability of the sensor, it is necessary to package and prepare the designed FBG (Fiber Bragg grating) vibration sensor structure. The accuracy of the packaged sensor has an important impact on the accuracy of signal monitoring.

[0004] The invention patent with publication number CN114256724A discloses a stress-free packaging device and packaging method for a resonant cavity grating for a fiber laser. The device consists of a fiber dynamometer, a pigtail clamp module, a resonant cavity fiber grating, a grating packaging module, a three-dimensional adjustment frame, a UV curing adhesive and a UV curing light source. The purpose of this patent is mainly to improve the wavelength stability of the light emitted by the fiber laser, but the problem of using the fiber grating without being damaged is not solved.

[0005] Therefore, it is an urgent problem to improve a packaging device that can realize fiber grating positioning and is not easy to damage the fiber grating. Summary of the invention

[0006] The purpose of the present invention is to provide a packaging device and method for a fiber grating cardiopulmonary vibration sensor in order to overcome the defects of the prior art.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] According to one aspect of the present invention, there is provided a packaging device for a fiber Bragg grating cardiopulmonary vibration sensor, the device being used for packaging a fiber Bragg grating vibration sensor head, the sensor head comprising a fiber Bragg grating, the device comprising a fiber Bragg grating tensioning module, a vibration diaphragm packaging module, a fiber Bragg grating positioning module and a base, the fiber Bragg grating tensioning module and the fiber Bragg grating positioning module being mounted on the base, the vibration diaphragm packaging module being mounted on the fiber Bragg grating positioning module, the sensor head being placed on the vibration diaphragm packaging module, the fiber Bragg grating of the sensor head passing through the vibration diaphragm packaging module, the fiber Bragg grating positioning module and the fiber Bragg grating tensioning module in sequence to complete the positioning of the fiber Bragg grating, and then the fiber Bragg grating is injected with glue to complete the packaging.

[0009] As a preferred technical solution, the vibration diaphragm packaging module includes a vibration diaphragm positioning plate, the fiber grating positioning module includes a first L-shaped positioning plate and a second L-shaped positioning plate, the vibration diaphragm positioning plate is respectively connected to the first L-shaped positioning plate and the second L-shaped positioning plate, and the fiber grating is installed on the vibration diaphragm positioning plate.

[0010] As a preferred technical solution, the device also includes a fiber optic positioning plate and a fiber optic positioning hole, the fiber optic positioning hole is installed on the fiber optic positioning plate, the fiber optic positioning plate is respectively installed on the first L-shaped positioning plate and the second L-shaped positioning plate, and the first L-shaped positioning plate and the second L-shaped positioning plate are both connected through the fiber optic positioning plate and the vibration diaphragm positioning plate.

[0011] As a preferred technical solution, the vibration diaphragm packaging module also includes a vibration diaphragm positioning hole, an optical fiber limiting groove, a polytetrafluoroethylene tube and a compression block. The vibration diaphragm positioning hole and the optical fiber limiting groove are both installed on the vibration diaphragm positioning plate, the polytetrafluoroethylene tube is installed in the optical fiber limiting groove, and the compression block is installed on the vibration diaphragm positioning plate and compresses the polytetrafluoroethylene tube.

[0012] As a preferred technical solution, the vibration diaphragm positioning hole is installed in the middle of the vibration diaphragm positioning plate, the optical fiber limiting groove passes through the vibration diaphragm positioning hole and is centrally installed in the vibration diaphragm positioning plate, and the polytetrafluoroethylene tube and the optical fiber positioning hole are coaxial.

[0013] As a preferred technical solution, the sensor head also includes a base circular structure, a PVC sheet and a vibration diaphragm, the vibration diaphragm is installed on the base circular structure, the fiber grating is installed on the vibration diaphragm, the PVC sheet and the base circular structure are connected, and the base circular structure is installed on the vibration diaphragm positioning hole.

[0014] As a preferred technical solution, the fiber Bragg grating tensioning module includes a first tensioning mechanism and a second tensioning mechanism, and the first tensioning mechanism and the second tensioning mechanism are both installed on a base and located on both sides of the fiber Bragg grating positioning module.

[0015] As a preferred technical solution, the first tensioning mechanism includes a first optical fiber tensioning unit and a first fine-tuning block, the second tensioning mechanism includes a second optical fiber tensioning unit and a second fine-tuning block, the first optical fiber tensioning unit is connected to the first fine-tuning block, the second tensioning mechanism includes a second optical fiber tensioning unit and a second fine-tuning block, and the first fine-tuning block and the second fine-tuning block are both installed on the base.

[0016] As a preferred technical solution, the base includes a plurality of base mounting holes, and the base is respectively connected to the fiber Bragg grating tensioning module and the fiber Bragg grating positioning module through the base mounting holes.

[0017] According to another aspect of the present invention, there is provided a method for packaging a fiber Bragg grating cardiopulmonary vibration sensor as described above, the method specifically comprising:

[0018] S1, installing the fiber Bragg grating tensioning module and the fiber Bragg grating positioning module on the base in sequence, installing the vibration diaphragm packaging module on the fiber Bragg grating positioning module, and placing the sensor head on the vibration diaphragm packaging module;

[0019] S2, the fiber Bragg grating of the sensor head passes through the fiber Bragg grating positioning module along the vibration diaphragm packaging module to be pre-tensioned, and the position of the fiber Bragg grating is adjusted;

[0020] S3, then tightening and positioning the fiber Bragg grating through a fiber Bragg grating tightening module;

[0021] S4. Inject glue into the fiber Bragg grating and take out the sensor after it solidifies.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. When the fiber Bragg grating of the present invention is positioned through the fiber Bragg grating tensioning module, the vibration diaphragm packaging module and the fiber Bragg grating positioning module, the fiber Bragg grating always maintains a small deformation. At the same time, it is pre-stretched and pre-positioned by the fiber Bragg grating positioning module. The pulling process is gentle, making it not easy to break. The final positioning and fixation are completed by the fiber Bragg grating tensioning module, which can improve the consistency of the sensor or product, protect the fiber Bragg grating and prevent damage; and can apply prestress to improve the performance of the sensor.

[0024] 2. The present invention is provided with a vibration diaphragm positioning hole, a fiber positioning groove and a fiber positioning hole, which ensure that the vibration diaphragm is accurately arranged in the vibration diaphragm positioning hole. The fiber grating can be accurately guided through the fiber positioning hole through the fiber positioning groove to complete the pre-positioning on the fiber grating positioning module. The fiber grating position can be appropriately adjusted to meet the requirements, and then the final positioning of the fiber grating is completed through the fiber grating tensioning module.

[0025] 3. The base of the present invention is provided with a plurality of base mounting holes, and the FBG tensioning module and the FBG positioning module can select the installation position according to the length requirement of the FBG, and have high flexibility.

[0026] 4. The optical fiber positioning groove of the present invention is installed at the center line position of the vibration diaphragm positioning plate, the polytetrafluoroethylene tube is installed in the optical fiber positioning groove, and the optical fiber Bragg grating passes through the polytetrafluoroethylene tube, ensuring that the optical fiber Bragg grating is packaged along the axial direction of the vibration diaphragm positioning plate.

[0027] 5. The first optical fiber tensioning unit and the second optical fiber tensioning unit of the present invention are both installed in a movable manner, and the first optical fiber tensioning unit and the second optical fiber tensioning unit can be flexibly selected for installation according to different tensioning methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 It is a structural schematic diagram of the sensor head of the present invention;

[0030] Figure 3 Schematic diagram of the arrangement of the fiber Bragg grating of the present invention;

[0031] Figure 4 It is a schematic diagram of the system structure of the fiber Bragg grating of the present invention.

[0032] 1. The first tensioning unit; 2. The first fine-tuning block; 3. The first L-shaped positioning plate; 4. The vibrating diaphragm positioning plate; 5. The second L-shaped positioning plate; 6. The second optical fiber tensioning unit; 7. The second fine-tuning block; 8. The base; 9. The optical fiber positioning plate; 10. The pressing block; 11. The polytetrafluoroethylene tube; 12. The base circular structure; 13. The PVC sheet; 14. The optical fiber grating; 15. The vibrating diaphragm. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0034] Detection methods represented by fiber Bragg grating sensors have the advantages of no electromagnetic field, high sensitivity, high resolution, large dynamic detection range, and real-time. They are widely used in the medical field after being arranged and packaged to make sensor measurement heads, such as micro-bend fiber sensors for cardiopulmonary dynamic signals, FBG vibration sensors, etc. Domestic and foreign researchers have achieved certain research results on how to prepare and package fiber Bragg grating sensors, and have designed a variety of packaging devices and preparation methods. Although some problems have been solved, various methods and devices have their own limitations, and specific sensor devices need to be designed for different sensor measurement head structures.

[0035] The purpose of the present invention is to provide a low-cost, simple and efficient device for producing fiber grating vibration sensors to address the problems of easy brittle breakage of optical fibers, complicated packaging process and low efficiency in mass production, so that the sensors have good service life and reliability.

[0036] In view of the above problems, the present invention provides a packaging device and method for a fiber grating cardiopulmonary vibration sensor; when the fiber grating of the present invention is positioned through a fiber grating tensioning module, a vibration diaphragm packaging module and a fiber grating positioning module, the fiber grating always maintains a small deformation, and at the same time, it is pre-stretched and pre-positioned through the fiber grating positioning module, and the pulling process is gentle, so that it is not easy to break. The final positioning and fixation are completed by the fiber grating tensioning module, which can improve the consistency of the sensor or product, protect the fiber grating, and prevent damage; prestress can be applied to improve the performance of the sensor. The present invention is provided with a vibration diaphragm positioning hole, a fiber optic positioning groove and a fiber optic positioning hole, which ensures that the vibration diaphragm is accurately arranged in the vibration diaphragm positioning hole. The fiber optic positioning groove can accurately guide the fiber grating to pass through the fiber optic positioning hole to complete the pre-positioning on the fiber optic grating positioning module, and the fiber optic grating position can be appropriately adjusted to meet the requirements, and then the fiber optic grating is finally positioned through the fiber optic grating tensioning module. The base of the present invention is provided with a plurality of groups of base mounting holes, and the fiber grating tensioning module and the fiber grating positioning module can select the installation position according to the length requirement of the fiber grating, and have high flexibility. The fiber grating positioning groove of the present invention is installed at the center line position of the vibration diaphragm positioning plate, and the polytetrafluoroethylene tube is installed in the fiber grating positioning groove. The fiber grating passes through the polytetrafluoroethylene tube, which ensures that the fiber grating is packaged along the axial direction of the vibration diaphragm positioning plate. The first fiber grating tensioning unit and the second fiber grating tensioning unit of the present invention are both installed in a movable manner, and the first fiber grating tensioning unit and the second fiber grating tensioning unit can be flexibly selected for installation according to different tensioning methods.

[0037] Example 1

[0038] like Figure 1 and Figure 2As shown, a packaging device of a fiber Bragg grating cardiopulmonary vibration sensor is used for packaging a fiber Bragg grating vibration sensor head. The sensor head includes a fiber Bragg grating 14. The device includes a fiber Bragg grating tensioning module, a vibration diaphragm packaging module, a fiber Bragg grating positioning module and a base 8. The fiber Bragg grating tensioning module and the fiber Bragg grating positioning module are installed on the base 8, the vibration diaphragm packaging module is installed on the fiber Bragg grating positioning module, and the sensor head is placed on the vibration diaphragm packaging module. The fiber Bragg grating 14 of the sensor head passes through the vibration diaphragm packaging module, the fiber Bragg grating positioning module and the fiber Bragg grating tensioning module in sequence to complete the positioning of the fiber Bragg grating 14, and then the fiber Bragg grating 14 is injected with glue to complete the packaging.

[0039] The vibration diaphragm packaging module includes a vibration diaphragm positioning plate 4, the fiber grating positioning module includes a first L-shaped positioning plate 3 and a second L-shaped positioning plate 5, the vibration diaphragm positioning plate 4 is connected to the first L-shaped positioning plate 3 and the second L-shaped positioning plate 5 respectively, and the fiber grating 14 is installed on the vibration diaphragm positioning plate 4.

[0040] The device also includes a fiber optic positioning plate 9 and a fiber optic positioning hole, wherein the fiber optic positioning hole is installed on the fiber optic positioning plate 9, and the fiber optic positioning plate 9 is installed on the first L-shaped positioning plate (3) and the second L-shaped positioning plate 5 respectively, and the first L-shaped positioning plate 3 and the second L-shaped positioning plate 5 are both connected through the fiber optic positioning plate 9 and the vibration diaphragm positioning plate 4.

[0041] The vibration diaphragm packaging module also includes a vibration diaphragm positioning hole, an optical fiber limiting groove, a polytetrafluoroethylene tube 11 and a pressing block 10. The vibration diaphragm positioning hole and the optical fiber limiting groove are both installed on the vibration diaphragm positioning plate 4. The polytetrafluoroethylene tube 11 is installed in the optical fiber limiting groove. The pressing block 10 is installed on the vibration diaphragm positioning plate 4 and presses the polytetrafluoroethylene tube 11.

[0042] The vibration diaphragm positioning hole is installed in the middle of the vibration diaphragm positioning plate 4, the optical fiber limiting groove passes through the vibration diaphragm positioning hole and is centrally installed in the vibration diaphragm positioning plate 4, and the polytetrafluoroethylene tube 11 and the optical fiber positioning hole are coaxial.

[0043] In this embodiment, the first L-shaped positioning plate 3 and the second L-shaped positioning plate 5 are respectively bolted to the base 8, and the vibration diaphragm packaging plate 4 is connected to the first L-shaped positioning plate 3 and the second L-shaped positioning plate 5 through positioning pins, respectively. The vibration diaphragm packaging plate 4 is located between the first L-shaped positioning plate 3 and the second L-shaped positioning plate 5, that is, the first L-shaped positioning plate 3 and the second L-shaped positioning plate 5 are distributed on both sides of the vibration diaphragm positioning plate 4 and are symmetrically distributed; the first fine-tuning block 2 and the second fine-tuning block 7 are both provided with fine-tuning block positioning holes, and the base 8 is provided with multiple groups of base positioning holes. The fine-tuning block positioning holes and the base positioning holes are connected by bolts, and the first fine-tuning block 2 and the second fine-tuning block 7 are installed on the base 8.

[0044] The fiber grating positioning module is embedded in two fiber optic positioning plates 9, the cross-section of the fiber optic positioning plate 9 is circular, and a fiber optic positioning hole is set in the middle of the fiber optic positioning plate 9. The fiber optic positioning plate 9 is fixed on the first L-shaped positioning plate 3 and the second L-shaped positioning plate 5 by positioning bolts. At the same time, the fiber optic positioning plate 9 is connected to the vibration diaphragm positioning plate 4 by positioning pins, that is, the two fiber optic positioning plates 9 are first installed on the two ends of the vibration diaphragm positioning plate 4, and then the vibration diaphragm positioning plate 4 is respectively installed on the first L-shaped positioning plate 3 and the second L-shaped positioning plate 5; the center area of ​​the circular fiber optic positioning plate 9 is set with an "O"-shaped fine-diameter through hole (that is, the fiber optic positioning hole) to ensure the precise positioning of the optical fiber at the center of the vibration diaphragm.

[0045] The diaphragm packaging module is composed of a vibration diaphragm positioning hole, an optical fiber positioning groove, a vibration diaphragm positioning plate 4, a polytetrafluoroethylene tube 11 and a clamping block 10. The optical fiber positioning groove is a V-shaped groove. The function of the vibration diaphragm positioning hole is mainly to arrange the vibration diaphragm in the vibration diaphragm positioning hole to ensure accurate positioning. The optical fiber positioning groove is processed at the center line position of the vibration diaphragm positioning plate 4 to ensure that the optical fiber is packaged along the axis direction of the vibration diaphragm positioning plate 4. The polytetrafluoroethylene tube 11 is embedded around the optical fiber positioning groove of the vibration diaphragm positioning plate 4. The clamping block 10 is fixed to the vibration diaphragm positioning plate 4 by screws. The clamping block 10 is installed above the polytetrafluoroethylene tube 11 to ensure that the polytetrafluoroethylene tube 11 is positioned in the optical fiber positioning groove of the vibration diaphragm positioning plate 4.

[0046] The sensor head also includes a base circular structure 12, a PVC sheet 13 and a vibration diaphragm 15, wherein the vibration diaphragm 15 is mounted on the base circular structure 12, the fiber grating 14 is mounted on the vibration diaphragm 15, the PVC sheet 13 is connected to the base circular structure 12, and the base circular structure 12 is mounted on the vibration diaphragm positioning hole.

[0047] The fiber Bragg grating tensioning module comprises a first tensioning mechanism and a second tensioning mechanism, wherein the first tensioning mechanism and the second tensioning mechanism are both mounted on the base 8 and are located at two sides of the fiber Bragg grating positioning module.

[0048] The first tensioning mechanism includes a first optical fiber tensioning unit 1 and a first fine-tuning block 2, the second tensioning mechanism includes a second optical fiber tensioning unit 6 and a second fine-tuning block 7, the first optical fiber tensioning unit 1 is connected to the first fine-tuning block 2, the second tensioning mechanism includes a second optical fiber tensioning unit 6 and a second fine-tuning block 7 are connected, and the first fine-tuning block 2 and the second fine-tuning block 7 are both installed on a base 8.

[0049] The base 8 includes a plurality of base mounting holes, and the base 8 is respectively connected to the fiber Bragg grating tensioning module and the fiber Bragg grating positioning module through the base mounting holes.

[0050] In this embodiment, the first tensioning unit 1 and the second tensioning unit 6 are formed by 3D printing, the first tensioning unit 1 is fixed on the first fine-tuning block 2, and the second tensioning unit 6 is fixedly installed on the second fine-tuning block 7. The first tensioning unit 1, the second tensioning unit 6, the first fine-tuning block 2 and the second fine-tuning block 7 are all provided with through holes, which are connected by bolts; the fiber grating 14 is adhered to the vibration diaphragm 15 with epoxy glue, and the PVC sheet 13 is connected to the base circular structure 12, so as to prepare a fiber grating sensor head that can monitor the heart and lungs, and is used to detect the strain caused by vibration.

[0051] like Figure 3 and Figure 4 As shown, the working principle of the fiber Bragg grating vibration sensing structure of the present invention is as follows: the FBG sensor is encapsulated on a vibrating diaphragm, L1 and L2 are 150 mm, L3 is 400 mm, two grating points are evenly distributed on each optical fiber, and the diaphragm structure is made of vibration-sensitive materials. When the human body has weak cardiopulmonary vibrations, the strain changes caused by the vibration can be transmitted to the optical fiber to indirectly change the grating period, and then converted into changes in the FBG reflection wavelength. Finally, the state of cardiopulmonary physiological information is reflected by detecting the drift of the wavelength.

[0052] Based on the above principle, the present invention also includes a signal demodulator and a display. The optical fiber adapter of the sensing component is connected to the signal demodulator. The light emitted by the light source of the demodulator is guided to the optical fiber Bragg grating of the optical fiber Bragg grating vibration sensing component through an optical cable. The demodulation unit receives the light reflected from the optical fiber Bragg grating and outputs an electrical signal reflecting the wavelength drift of the reflected light.

[0053] The signal demodulation instrument (fiber grating demodulation instrument) includes a light source and an optical cable. The light of the broadband light source is incident on the sensing optical fiber through a coupler with a certain bandpass. Two FBG sensors with different reflection center wavelengths are strung in the sensing optical fiber, and each FBG sensor corresponds to a different physical quantity measurement. Different FBG sensors reflect light of a specific wavelength due to Bragg conditions, and these reflected lights are returned to the demodulator. The demodulator detects the change in the center wavelength of the reflected light of each FBG sensor through high-precision spectral analysis technology, and then calculates the corresponding change in the vibration physical quantity. Based on the wavelength offset, the vibration amplitude or vibration signal law of the weak cardiopulmonary signal can be determined.

[0054] In summary, the packaging device of the present invention also has the following advantages: improving the consistency of sensors or products; protecting the fiber grating to prevent damage; reserving stress to improve the performance of the sensor. After the FBG sensor is packaged, the pre-stretching capacity of the fiber grating can be increased, the fatigue life of the sensor can be improved, the long-term stability and environmental adaptability of the sensor can be improved, and the accuracy and reliability of the sensor during long-term operation can be ensured. The packaging device provides an experimental platform foundation for the packaging and development of vibration sensor heads. The fiber grating weak vibration sensor involved in the present invention adopts a distributed fiber grating structure design, optimizes the grid point arrangement, increases the number of strain detection points, improves monitoring efficiency and accuracy, resists electromagnetic interference, can monitor strain in real time, does not require expensive demodulation equipment, and greatly reduces costs.

[0055] Example 2

[0056] A method for packaging a fiber Bragg grating cardiopulmonary vibration sensor, the method specifically comprising:

[0057] S1, installing the fiber Bragg grating tensioning module and the fiber Bragg grating positioning module on the base 8 in sequence, installing the vibration diaphragm packaging module on the fiber Bragg grating positioning module, and placing the sensor head on the vibration diaphragm packaging module;

[0058] S2, the fiber Bragg grating 14 of the sensor head is pre-tensioned along the vibration diaphragm packaging module through the fiber Bragg grating positioning module to adjust the position of the fiber Bragg grating 14;

[0059] S3, then tightening and positioning the fiber Bragg grating 14 through a fiber Bragg grating tightening module;

[0060] S4, inject glue into the fiber Bragg grating 14, and take out the sensor after it solidifies.

[0061] In this embodiment, the operation steps of packaging the sensor using the packaging device of the present invention are specifically as follows:

[0062] 1) Preparation: Wipe the preparation platform clean and prepare various tools required for preparation, such as epoxy resin, various types of screwdrivers, heat shrink tubing, etc.

[0063] 2) Install the packaging fixture. Install the fiber Bragg grating tensioning module and the fiber Bragg grating positioning module on the base 8 in sequence, install the vibration diaphragm packaging module on the fiber Bragg grating positioning module, place the vibration diaphragm 15 in the fiber positioning groove of the vibration diaphragm packaging module, and fix it with the pressing block 10.

[0064] 3) Insert the fiber Bragg grating. Carefully take out the fiber Bragg grating, and pass the fiber Bragg grating 14 through the fiber positioning hole of the fiber positioning plate 9 along the fiber positioning groove in sequence. Pre-tighten the two ends of the optical fiber after passing through, adjust the axial position of each fiber Bragg grating point, and tighten each end of the optical fiber again with the fiber Bragg grating tensioning module to ensure that the fiber Bragg grating 14 is in a straight state and the position of the grating point does not change during the glue injection process.

[0065] 4) Adjust the position of the fiber grating and inject glue. Adjust the position of the fiber grating point so that the grating point is located at the center of the vibration diaphragm 15. The optical fiber is distributed along the fiber positioning groove. The fiber grating 14 is tightened again by the first tightening mechanism and the second tightening mechanism so that it is taut in the horizontal direction. Heat the epoxy glue and inject it into the polytetrafluoroethylene tube 11. After the glue solidifies, take out the sensor. After softening the polytetrafluoroethylene tube 11 with a hot air blower, heat the glue in a water bath and stir it evenly. Use a syringe to inject the epoxy resin glue into the semicircular polytetrafluoroethylene tube 11. After the glue is injected, adjust the position of the fiber grating 14, tighten the fiber grating 14 again, so that it is taut in the glue, fix the polytetrafluoroethylene tube 11 with a clamping block 10, and take out the fiber grating vibration sensor after the glue solidifies.

[0066] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A packaging device for a fiber Bragg grating cardiopulmonary vibration sensor, the device being used for packaging a fiber Bragg grating vibration sensor head, the sensor head comprising a fiber Bragg grating (14), characterized in that: The device comprises a fiber Bragg grating tensioning module, a vibration diaphragm packaging module, a fiber Bragg grating positioning module and a base (8), wherein the fiber Bragg grating tensioning module and the fiber Bragg grating positioning module are mounted on the base (8), the vibration diaphragm packaging module is mounted on the fiber Bragg grating positioning module, and the sensor head is placed on the vibration diaphragm packaging module. The fiber Bragg grating (14) of the sensor head passes through the vibration diaphragm packaging module, the fiber Bragg grating positioning module and the fiber Bragg grating tensioning module in sequence to complete the positioning of the fiber Bragg grating (14), and then the fiber Bragg grating (14) is injected with glue to complete the packaging.

2. The packaging device of a fiber Bragg grating cardiopulmonary vibration sensor according to claim 1, characterized in that: The vibration diaphragm packaging module comprises a vibration diaphragm positioning plate (4), the fiber optic Bragg grating positioning module comprises a first L-shaped positioning plate (3) and a second L-shaped positioning plate (5), the vibration diaphragm positioning plate (4) is connected to the first L-shaped positioning plate (3) and the second L-shaped positioning plate (5), respectively, and the fiber optic Bragg grating (14) is mounted on the vibration diaphragm positioning plate (4).

3. The packaging device of a fiber Bragg grating cardiopulmonary vibration sensor according to claim 2, characterized in that: The device further comprises an optical fiber positioning plate (9) and an optical fiber positioning hole, wherein the optical fiber positioning hole is mounted on the optical fiber positioning plate (9), and the optical fiber positioning plate (9) is respectively mounted on the first L-shaped positioning plate (3) and the second L-shaped positioning plate (5), and the first L-shaped positioning plate (3) and the second L-shaped positioning plate (5) are both connected via the optical fiber positioning plate (9) and the vibrating diaphragm positioning plate (4).

4. The packaging device of a fiber Bragg grating cardiopulmonary vibration sensor according to claim 3, characterized in that: The vibration diaphragm packaging module also includes a vibration diaphragm positioning hole, an optical fiber limiting groove, a polytetrafluoroethylene tube (11) and a pressing block (10); the vibration diaphragm positioning hole and the optical fiber limiting groove are both installed on the vibration diaphragm positioning plate (4); the polytetrafluoroethylene tube (11) is installed in the optical fiber limiting groove; and the pressing block (10) is installed on the vibration diaphragm positioning plate (4) and presses the polytetrafluoroethylene tube (11).

5. The packaging device of the fiber Bragg grating cardiopulmonary vibration sensor according to claim 4, characterized in that: The vibration diaphragm positioning hole is installed in the middle of the vibration diaphragm positioning plate (4), the optical fiber limiting groove passes through the vibration diaphragm positioning hole and is centrally installed in the vibration diaphragm positioning plate (4), and the polytetrafluoroethylene tube (11) and the optical fiber positioning hole are coaxial.

6. The packaging device of a fiber Bragg grating cardiopulmonary vibration sensor according to claim 4, characterized in that: The sensor head also includes a base circular structure (12), a PVC sheet (13) and a vibration diaphragm (15), wherein the vibration diaphragm (15) is mounted on the base circular structure (12), the fiber grating (14) is mounted on the vibration diaphragm (15), the PVC sheet (13) and the base circular structure (12) are connected, and the base circular structure (12) is mounted on a positioning hole of the vibration diaphragm.

7. The packaging device of a fiber Bragg grating cardiopulmonary vibration sensor according to claim 1, characterized in that: The fiber Bragg grating tensioning module comprises a first tensioning mechanism and a second tensioning mechanism, wherein the first tensioning mechanism and the second tensioning mechanism are both mounted on a base (8) and are located on both sides of the fiber Bragg grating positioning module.

8. The packaging device of the fiber Bragg grating cardiopulmonary vibration sensor according to claim 7, characterized in that: The first tensioning mechanism comprises a first optical fiber tensioning unit (1) and a first fine-tuning block (2), the second tensioning mechanism comprises a second optical fiber tensioning unit (6) and a second fine-tuning block (7), the first optical fiber tensioning unit (1) and the first fine-tuning block (2) are connected, the second tensioning mechanism comprises a second optical fiber tensioning unit (6) and the second fine-tuning block (7) are connected, and the first fine-tuning block (2) and the second fine-tuning block (7) are both mounted on a base (8).

9. The packaging device of a fiber Bragg grating cardiopulmonary vibration sensor according to claim 1, characterized in that: The base (8) comprises a plurality of groups of base mounting holes, and the base (8) is respectively connected to the fiber optic Bragg grating tensioning module and the fiber optic Bragg grating positioning module through the base mounting holes.

10. A packaging device for a fiber Bragg grating cardiopulmonary vibration sensor as claimed in any one of claims 1 to 9, characterized in that: The method specifically comprises: S1, installing the fiber Bragg grating tensioning module and the fiber Bragg grating positioning module on the base (8) in sequence, installing the vibration diaphragm packaging module on the fiber Bragg grating positioning module, and placing the sensor head on the vibration diaphragm packaging module; S2, the fiber Bragg grating (14) of the sensor head is pre-tensioned along the vibration diaphragm packaging module through the fiber Bragg grating positioning module to adjust the position of the fiber Bragg grating (14); S3, then tightening and positioning the fiber Bragg grating (14) through a fiber Bragg grating tightening module; S4, inject glue into the fiber Bragg grating (14), and take out the sensor after it solidifies.

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