Airtight packaging structure, packaging device, and packaging method of optical fiber sensor

Abstract

The present invention provides an airtight packaging structure, which includes a packaging tube, an optical fiber sensor, a packaging gas, and a sealing structure. The present invention also provides an airtight packaging device and a packaging method. The airtight packaging structure provided by the present invention can effectively reduce or avoid the problems of rapid deterioration of mechanical strength and optical performance caused by chemical reactions between optical fibers and external pollutants and air in extremely harsh environments, such as high temperature, strong electromagnetic radiation, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber sensors, and in particular to an airtight packaging structure, a packaging device, and a packaging method for optical fiber sensors. Background Art

[0002] Sensing detection in extremely harsh environments such as aerospace, nuclear power plants, and petrochemicals has always been a difficult point in the field of sensing detection. Extremely harsh environments with high temperature, strong electromagnetics, and strong radiation will affect the performance of traditional electrical sensors and instruments.

[0003] Optical fiber sensors have a series of excellent characteristics such as strong anti-interference, small size, light weight, high measurement accuracy, etc., so they have broad application prospects in the field of sensing detection in extremely harsh environments. However, due to the damage of pollutants and air in the external environment, such as water vapor, dust, etc., there are fatal problems such as the sharp deterioration of the mechanical strength and optical properties of optical fiber materials in extremely harsh environments with high temperature, strong electromagnetic and strong radiation, which greatly limits the development of optical fiber sensors in extremely harsh environments.

[0004] Among the existing methods, gluing, substrate packaging, polymer packaging and traditional tube packaging face the problem of failure in extremely harsh environments such as high temperature, strong electromagnetic and strong radiation. They are also unable to fundamentally reduce or avoid the damage to optical fibers by pollutants and air in the external environment. Therefore, airtight packaging solutions for optical fiber sensors in extremely harsh environments are extremely important. Summary of the invention

[0005] In order to solve the above-mentioned deficiencies in the prior art, the present invention provides an airtight packaging structure, a packaging device, and a packaging method for an optical fiber sensor.

[0006] The present application provides an airtight packaging structure of an optical fiber sensor, which includes a packaging tube, an optical fiber sensor, packaging gas and sealant; the main body of the optical fiber sensor is located in the packaging tube, at least one end of the optical fiber sensor is located outside the packaging tube, the tube mouth of the packaging tube is provided with a sealing structure, and the interior of the packaging tube is filled with packaging gas.

[0007] The present application also provides an airtight packaging device for an optical fiber sensor, comprising a sealing box, an air supply device, and a pipe opening sealing device;

[0008] The gas supply device includes a gas source for providing packaging gas, a gas inlet arranged on the sealing box, and a gas guide tube; the optical fiber sensor is inserted into the packaging tube, and the tube mouth of the packaging tube is connected to the cavity in the sealing box;

[0009] The gas supply device fills the sealed box cavity with gas through the gas inlet, and the gas guide pipe is used to extend into the packaging tube to fill the interior of the packaging tube with gas;

[0010] The pipe opening sealing device is arranged in the sealing box.

[0011] An embodiment of the present application provides an airtight packaging device for an optical fiber sensor, wherein the gas supply device further includes a gas control device connected to a gas source; and a gas outlet is provided on the sealing box.

[0012] An airtight packaging device for an optical fiber sensor provided in an embodiment of the present application further includes a gas detection device, wherein a probe of the gas detection device is disposed in a sealed box.

[0013] An embodiment of the present application provides an airtight packaging device for an optical fiber sensor, wherein a through hole is provided on the sealing box, the air guide tube extends from the through hole into the packaging tube, and a hollow sealing plug is provided at the through hole.

[0014] An embodiment of the present application provides an airtight packaging device for an optical fiber sensor, wherein the sealing box has a visible window or the sealing box is a transparent structure.

[0015] An embodiment of the present application provides an airtight packaging device for an optical fiber sensor, wherein the sealing structure is a sealant, and the airtight packaging device further includes a curing device.

[0016] The present application also provides a method for airtight packaging of an optical fiber sensor, which is used to realize the above-mentioned airtight packaging structure, and is characterized in that it comprises the following steps:

[0017] Preparation stage: insert the optical fiber sensor into the packaging tube, make the tube opening of the packaging tube communicate with the cavity in the sealing box, and extend one end of the air guide tube into the packaging tube;

[0018] Gas filling: Fill the sealed box cavity with packaging gas, and fill the packaging tube with packaging gas through the air guide tube;

[0019] Tube mouth sealing: Pull the capillary air guide tube out of the packaging tube and seal the tube mouth of the packaging tube.

[0020] An airtight packaging method for an optical fiber sensor provided in an embodiment of the present application uses a gas detection device to monitor the concentration of packaging gas in a sealed box in real time during the gas filling process; after the packaging gas concentration reaches the requirement, the pipe mouth is sealed.

[0021] In an airtight packaging method for an optical fiber sensor provided in an embodiment of the present application, a sealing process is performed on the tube opening of a packaging tube using a sealant, and then a curing process is performed.

[0022] The present invention has the following beneficial effects:

[0023] The present invention provides an airtight packaging structure, packaging device, and packaging method, which can effectively reduce or avoid the problems of sharp deterioration of mechanical strength and optical performance caused by chemical reactions between optical fiber and external pollutants and air in extremely harsh environments, such as high temperature, strong electromagnetic radiation, etc. It can improve the stability and durability of optical fiber sensors in extremely harsh environments, further increase the measurement temperature range of optical fiber sensors, and enhance the reliability of optical fiber sensors, so that they can be widely used in fields such as aircraft engines, nuclear power plants, and petrochemicals. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of an airtight packaging structure of an optical fiber sensor according to a first embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of a gas-tight packaging device for an optical fiber sensor according to a second embodiment of the present invention, during a gas filling stage;

[0026] Figure 3 yes Figure 2 A schematic diagram of the structure of the sealing box;

[0027] Figure 4 This is a schematic diagram of an airtight packaging device for an optical fiber sensor according to a second embodiment of the present invention, in the packaging preparation stage;

[0028] Figure 5 It is a structural schematic diagram of a specific application of an airtight packaging structure of an optical fiber sensor according to an embodiment of the present invention.

[0029] Figure annotation:

[0030] 101-gas source, 102-gas control device, 20-sealed box,

[0031] 201-first through hole, 202-second through hole, 203-third through hole, 204-gas inlet, 205-gas outlet, 206-fourth through hole, 207-capillary gas tube, 301-optical fiber sensor, 302-packaging tube, 303-packaging gas, 304-sealant, 305-element, 306-specific component, 401-gas sampling probe, 402-gas detector, 403-connecting tube. DETAILED DESCRIPTION

[0032] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0033] Embodiment 1

[0034] A specific embodiment of the present application provides an airtight packaging structure for an optical fiber sensor.

[0035] like Figure 1 As shown, the packaging structure includes a packaging tube (302), an optical fiber sensor (301), packaging gas (303) and a sealing structure.

[0036] In the present application, the main body of the optical fiber sensor (301) is located in a packaging tube (302), and the packaging tube (302) protects the main body of the optical fiber sensor (301). The end of the optical fiber sensor (301) is located outside the packaging tube (302). A sealing structure is provided at the tube mouth of the packaging tube (302). The interior of the packaging tube (302) is sealed and filled with packaging gas (303).

[0037] In the embodiment of the present invention, the optical fiber sensor (301) is made of optical fiber, and the material of the optical fiber includes but is not limited to: α-Al 2 O 3 , ruby, MgO, ZrO 2 , quartz, or other materials.

[0038] Preferably, a material that is resistant to high temperature, corrosion, radiation and has excellent air tightness is used as the material for making the packaging tube (302), which can prevent the invasion of pollutants and air in the external environment. The material of the packaging tube (302) includes but is not limited to: Al 2 O 3 、MgO、ZrO 2 , BeO, or metal, or liquid crystal polymer, or other materials.

[0039] In a specific embodiment, one end of the packaging tube (302) is closed and the other end is open. After packaging, only one end of the optical fiber sensor (301) is exposed from the packaging tube (302).

[0040] However, it is understandable that the packaging structure is not limited thereto. For example, some types of optical fiber sensors (301) may have both ends exposed from the packaging tube (302), or one end exposed from the packaging tube (302). This depends on the type of optical fiber sensor and the environment in which it is used.

[0041] When both ends of the optical fiber sensor (301) are exposed from the packaging tube (302), the packaging tube (302) is a structure with both ends open.

[0042] The inner diameter of the packaging tube (302) is slightly larger than the diameter of the optical fiber, so as to reserve operating space for the subsequent process of using the capillary gas guide tube (207) to fill the packaging tube (302) with gas.

[0043] The sealing structure may be a sealant seal, or may be a mechanical welding, an oxygen-free copper gasket or other sealing structure to seal the tube opening of the packaging tube (302).

[0044] In a preferred embodiment, the sealing structure is a sealant (304). The sealant (304) has the properties of excellent air tightness and strong bonding performance. The sealant (304) is, for example, epoxy resin glue, or a single-component glue, or a two-component glue, or other colloid materials. The sealant (304) is preferably selected to be resistant to high temperatures, has excellent air tightness, and has a thermal expansion coefficient similar to that of the packaging tube (302), so as to ensure that the optical fiber sensor (301) can work normally and stably for a long time in an extremely harsh environment after packaging.

[0045] The packaging gas (303) has the properties of high stability and is not easy to react with the optical fiber material. The packaging gas (303) is argon, nitrogen, helium, or other gases.

[0046] By using a specific gas to fill and protect the packaging tube (302), the problems of rapid deterioration of mechanical strength and optical performance caused by chemical reactions between the optical fiber sensor (301) and external pollutants and air can be reduced or avoided, thereby protecting the optical fiber sensor (301) from normal and stable operation for a long time in an extremely harsh environment, and enhancing the durability of the optical fiber sensor (301).

[0047] Embodiment 2

[0048] A specific embodiment of the present application provides an airtight packaging device for an optical fiber sensor, and the airtight packaging device is used to manufacture the airtight packaging structure described in the first embodiment.

[0049] like Figure 2 As shown, the airtight packaging device comprises a sealing box (20), a gas supply device, and a gas detection device (402).

[0050] The optical fiber sensor (301) is packaged in a sealing box (20) of an airtight packaging device.

[0051] The gas supply device comprises a gas source (101) for providing packaging gas (303) and a gas inlet (204) arranged on the sealed box (20). The gas supply device fills the packaging gas (303) into the cavity of the sealed box (20) through the gas inlet (204). The sealed box (20) is provided with a gas outlet (205). The gas sampling probe (401) of the gas detection device (402) is arranged in the sealed box (20) and can monitor the concentration of the packaging gas (303) in the sealed box (20) in real time.

[0052] In the airtight packaging device of the present application, the optical fiber sensor (301) is inserted into a packaging tube (302), one end of the packaging tube (302) is sealed, and the tube opening of the packaging tube is connected to the cavity in the sealing box (20).

[0053] Furthermore, the gas supply device further comprises an air guide tube. The air guide tube is preferably a capillary air guide tube (207), and the capillary air guide tube (207) can be connected to the gas supply device.

[0054] The capillary gas guide tube (207) is used to extend into the packaging tube (302) to fill the interior of the packaging tube (302) with gas. As a more preferred solution, the capillary gas guide tube (207) extends into the closed end of the packaging tube (302) to ensure that the packaging gas (303) is fully filled.

[0055] A portion of the packaging gas (303) enters the cavity of the sealing box (20) through the gas inlet (204), and another portion of the packaging gas (303) is introduced into the packaging tube (302) through the capillary gas guide tube (207). The former is to fill the sealing box (20) with gas. The latter is to fill the packaging tube (302) with gas. After the packaging gas (303) is introduced during the packaging process, the gas in the original space is discharged through the gas outlet (205).

[0056] In the present application, the cavity of the sealing box (20) and the packaging tube (302) are filled simultaneously, so that, on the one hand, the entire packaging process is carried out in the environment of the packaging gas (303), and on the other hand, it is ensured that after packaging, the concentration of the packaging gas (303) in the packaging tube (302) reaches the corresponding high requirement, thereby avoiding the insufficient concentration of the packaging gas (303) in the packaging tube (302).

[0057] The internal volume of the packaging tube (302) is relatively small, so the density of the packaging gas (303) in the packaging tube (302) reaches the required gas concentration first, and the concentration of the packaging gas (303) in the cavity of the sealed box (20) reaches the required gas concentration later. Therefore, when the gas detection device (402) detects that the gas concentration has been reached, the gas filling is completed. The gas concentration needs to be maintained during the packaging process. The gas detection device (402) includes a gas detector, which is, for example, a pump-type gas detector, or an electrochemical gas detector, or an infrared gas detector, or other types of gas detectors. The gas detector is connected to the gas sampling probe (401).

[0058] Preferably, a high-precision gas detection device (402) is used to monitor and display the concentrations of various gas components during the packaging process in real time, thereby improving the reliability and accuracy of packaging.

[0059] In the embodiment of the present invention, the gas source (101) is, for example, a gas tank. The gas tank can provide the packaging gas (303) required for the packaging process. The gas source (101) can also be a gas generating device, which is an inert gas generating device or a Kipp generator.

[0060] The gas supply device further comprises a gas control device (102), which is connected to the gas source (101) and is used to control the gas flowing to the gas inlet (204) and the capillary gas guide tube. The gas control device (102) may be a gas pressure controller, a gas flow meter, a needle valve, etc.

[0061] The sealing box (20) of the specific embodiment of the present application has a visual window, which allows for convenient observation. Preferably, the sealing box (20) is made of a transparent material as a whole, so that the inside of the sealing box (20) has a good field of view, the overall state is completely visible, and the operation is convenient.

[0062] The sealing box (20) has excellent air tightness and can be used to ensure the gas environment during the packaging process, thereby enhancing the overall reliability and accuracy of the packaging process.

[0063] The airtight packaging device also includes a pipe opening sealing device, which is arranged in the sealing box (20). After the gas filling is completed, the capillary air guide tube (207) is pulled out of the packaging tube (302), and the pipe opening of the packaging tube (302) is sealed.

[0064] When sealing, the tube opening of the packaging tube (302) can be sealed by means of sealant, or by means of mechanical welding, oxygen-free copper gasket or other sealing structures.

[0065] The pipe mouth sealing device is preferably a glue applying device. The glue applying device can be a glue applying rod, glue nozzle, glue pouring head, and other glue applying parts or glue outlets of equipment that can be used for glue application. The colloid is applied to the pipe mouth of the packaging tube 302 by glue coating, glue spraying, glue pouring, or glue squeezing.

[0066] As a more specific embodiment, a fourth through hole (206) can be provided on the top of the sealing box (20), and a glue applying device (not shown in the figure) can be inserted to dip in non-solid sealant (304) to apply glue to the tube opening of the packaging tube (302). It can be understood that a hollow sealing plug with excellent airtightness is provided in the fourth through hole (206).

[0067] It can be understood that the tube opening sealing device is used to seal the tube opening of the packaging tube (302), and is not limited to the above-mentioned specific embodiment.

[0068] An airtight packaging device for an optical fiber sensor provided in an embodiment of the present application comprises a through hole provided on a sealing box (20), and a packaging tube (302) and a capillary air guide tube (207) extending from the through hole into the packaging tube (302).

[0069] More specifically, the sealed box (20) is provided with a first through hole (201) and a third through hole (203). The packaging tube (302) extends into the sealed box (20) from the first through hole (201), and the capillary air guide tube (207) extends into the packaging tube (302) from the third through hole (203). It can be understood that the height positions of the first through hole (201) and the third through hole (203) correspond to each other, so that the capillary air guide tube (207) extends into the packaging tube (302). The first through hole (201) and the third through hole (203) may also be one through hole, and the packaging tube (302) and the capillary air guide tube (207) extend into the packaging tube (302) from the first through hole (201) at the same time.

[0070] The packaging tube (302) is not limited to extending into the packaging tube (302) from the through hole; the packaging tube (302) may also be fixed in a sealed box.

[0071] It can be understood that in order to ensure the airtightness of the entire device, hollow sealing plugs with excellent airtightness are provided at the first through hole (201) and the third through hole (203). The hollow structure facilitates the insertion and extension of the packaging tube (302) and the capillary air guide tube (207).

[0072] After the gas filling is completed and the capillary air guide tube (207) is pulled out of the packaging tube (302), the capillary air guide tube (207) is still located at the hollow sealing plug.

[0073] The sealing box (20) is also provided with a second through hole (202), and the second through hole (202) is used to install a gas sampling probe (401). The gas sampling probe (401) is connected to the gas detector via a connecting pipe (403).

[0074] In the embodiment of the present application, when the tube opening of the packaging tube (302) is sealed by the sealant (304), further, depending on the material of the sealant, the airtight packaging device also includes a colloid curing device for further curing the sealant (304). The colloid curing device is an incandescent lamp, an infrared heating lamp, an iodine tungsten lamp, or other devices that can provide a heat source.

[0075] After the gas filling is completed, the tube opening of the packaging tube (302) is sealed by a sealant (304) to form a sealing structure, and then a curing process is performed.

[0076] Embodiment 3

[0077] The specific embodiment of the present application provides a method for airtight packaging of an optical fiber sensor, which is used to implement the airtight packaging structure of the first embodiment, and specifically includes the following steps:

[0078] S1, preparation stage: inserting the optical fiber sensor (301) into the packaging tube (302), making the tube opening of the packaging tube (302) communicate with the cavity in the sealing box (20), and extending the air guide tube into the packaging tube (302);

[0079] S2, gas filling: opening the gas source (101) and the gas control device (102), filling the cavity of the sealing box (20) with the packaging gas (303), and at the same time filling the interior of the packaging tube (302) with the packaging gas through the gas guide tube;

[0080] S3, gas detection: during the gas filling process, the gas concentration in the sealed box (20) is monitored in real time using a gas detection device (402);

[0081] S4, sealing the pipe opening: after the gas concentration reaches the requirement, the gas guide pipe is pulled out of the packaging tube (302), and the pipe opening of the packaging tube (302) is sealed.

[0082] Wherein, the sealing box (20) has a visible window.

[0083] In step S4, the pipe opening is sealed in a sealing box (20).

[0084] In step S1, one end of the packaging tube (302) is inserted into the sealing box (20), so that the tube opening of the packaging tube (302) is connected to the cavity inside the sealing box (20).

[0085] The air guide tube is preferably a capillary air guide tube (207), and one end of the capillary air guide tube (207) extends into the packaging tube (302).

[0086] In step S2, the packaging gas (303) provided by the gas source (101) is controlled by the gas control device (102). A portion of the packaging gas (303) enters the cavity of the sealed box (20) through the gas inlet (204), and another portion of the packaging gas (303) is introduced into the packaging tube (302) through the capillary gas guide tube (207). The former is to fill the sealed box (20) with gas. The latter is to fill the packaging tube (302) with gas. After the packaging gas (303) is introduced during the packaging process, the gas in the original space is discharged through the gas outlet (205).

[0087] During the gas filling process, the internal volume of the packaging tube (302) is relatively small, so the density of the packaging gas (303) in the packaging tube (302) reaches the required gas concentration first, and the concentration of the packaging gas (303) in the cavity of the sealing box (20) reaches the requirement later.

[0088] The gas detection device (402) can monitor and display the concentration of the corresponding gas component in real time. When the gas detection device (402) detects that the gas concentration reaches a certain value, the gas filling is completed. The packaging gas concentration needs to be maintained during the packaging process.

[0089] In an airtight packaging method for an optical fiber sensor provided in an embodiment of the present application, in step S4, a sealant (304) may be used to apply sealant to the tube opening of the packaging tube (302).

[0090] In addition to the glue coating sealing treatment method, the tube opening of the packaging tube (302) can also be sealed by mechanical welding, oxygen-free copper gaskets and other sealing methods, which can also achieve a good sealing effect.

[0091] When sealing the tube opening of the packaging tube (302) by means of the sealant (304), a sealant (304) that is resistant to high temperatures and has excellent air tightness and has a thermal expansion coefficient similar to that of the packaging tube (302) is selected to ensure the air tightness of the packaging structure, so that the optical fiber sensor (301) can work normally and stably for a long time in an extremely harsh environment after packaging.

[0092] The sealant (304) is then cured. The curing process may be natural curing at room temperature. However, preferably, in order to improve the performance of the cured sealant, a heating curing process may be performed.

[0093] As a more preferred solution, after the tube mouth is sealed, it is first placed in a sealing box (20) and cured at room temperature for a certain period of time for pre-curing. A preliminary airtight packaging structure of the optical fiber sensor is obtained. Afterwards, the sealant (304) is heated and heated using a colloid curing device for further curing. This is to ensure that the sealant (304) is completely cured to ensure the airtightness of the packaging structure, thereby protecting the packaged optical fiber sensor (301) to work normally and stably for a long time in extremely harsh environments. In order to further improve the airtightness of the packaged optical fiber sensor, it is preferred that during the further curing process, the tube mouth of the packaging tube (302) remains in the sealing box (20), such as Figure 4 After complete solidification, the packaging tube (302) is then pulled away from the first through hole (201).

[0094] An embodiment of the present application provides a method for airtight packaging of an optical fiber sensor, in step S1, a packaging tube (302) and a capillary air guide tube (207) extend from a through hole into the packaging tube (302). More specifically, in a specific embodiment, the packaging tube (302) extends from a first through hole (201) on one side of the sealing box (20) into the sealing box (20), and the capillary air guide tube (207) extends from a third through hole (203) on the other side of the sealing box (20) into the packaging tube (302). Preferably, the capillary air guide tube (207) extends all the way into the end of the packaging tube (302) to ensure that the gas is fully filled.

[0095] Hollow sealing plugs are provided in the first through hole (201) and the third through hole (203) to ensure the airtightness of the sealing box (20). The first through hole (201) and the third through hole (203) may also be one through hole, and the packaging tube (302) and the capillary air guide tube (207) extend from the through hole at the same time.

[0096] It should be noted that the packaging tube (302) is not limited to extending into the packaging tube (302) through the through hole; the packaging tube (302) may also be fixed in a sealed box.

[0097] According to the above-mentioned airtight packaging method, when the packaging tube (302) is a corundum tube and the packaging gas (303) is argon, the prepared optical fiber sensor (301) can be used as an optical fiber high temperature sensor. The optical fiber high temperature sensor can be used in the aerospace field, such as in a specific component (306) such as an aircraft engine, where an instrument, system or component (305) is connected to the optical fiber sensor (301) for real-time status monitoring and fault diagnosis to ensure safe and reliable operation of the engine.

[0098] According to the above-mentioned airtight packaging method, when the packaging tube (302) is a beryllium oxide ceramic tube and the packaging gas (303) is nitrogen, the prepared optical fiber sensor (301) can be used as an optical fiber high temperature sensor. The optical fiber high temperature sensor can be used in the field of nuclear power plants, such as for specific components (306) such as the core outlet of a nuclear reactor, and the instrument, system or component (305) is connected to the optical fiber sensor (301) for real-time temperature monitoring to monitor the safe operation of the nuclear reactor.

[0099] In this embodiment, the airtight packaging device of the second embodiment can be used to realize the preparation of the airtight packaging structure of the optical fiber sensor.

[0100] The above packaging method is not only applicable to Figure 1 The airtight packaging structure of the optical fiber sensor shown, i.e., only one end of the optical fiber sensor (301) is exposed from the packaging tube (302), is also applicable to a structure in which both ends of the optical fiber sensor (301) are exposed from the packaging tube (302).

[0101] In the case where both ends of the optical fiber sensor (301) are exposed from the packaging tube (302), the packaging tube (302) is a structure with both ends open. The optical fiber sensor (301) can be inserted into the packaging tube first, and then both ends of the optical fiber sensor (301) are exposed from the packaging tube. Further, one end of the packaging tube (302) is selected for sealing, which is equivalent to inserting the optical fiber sensor into the packaging tube in the above step S1. After that, the other operations of step S1 are performed: the other unsealed port of the packaging tube (302) is connected to the cavity in the sealing box (20), and the air guide tube is extended into the packaging tube (302). Then, steps S2 to S4 are performed.

[0102] In this embodiment, after the airtight packaging structure of the optical fiber sensor (301) is prepared by the above method, the airtight packaging structure can be connected with the relevant elements (305) of the application environment in various ways when it is specifically applied to a specific component. For example, the airtight packaging structure can be connected with the relevant components by means of a sleeve connection, a compression connection, a threaded connection, etc.

[0103] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the scope of patent protection of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is also within the scope of patent protection of this application.

Claims

1. An airtight packaging device for an optical fiber sensor, characterized in that: It includes a sealing box, an air supply device, and a pipe opening sealing device; The gas supply device includes a gas source for providing packaging gas, a gas inlet arranged on the sealing box, and a gas guide tube; the optical fiber sensor is inserted into the packaging tube, one end of the packaging tube is closed and the other end is open; the tube mouth of the packaging tube is connected to the cavity in the sealing box; The gas supply device fills the sealed box cavity with gas through the gas inlet, and the gas guide pipe is used to extend into the packaging tube to fill the interior of the packaging tube with gas; The pipe opening sealing device is arranged in the sealing box; The sealed box is provided with a first through hole and a third through hole, wherein the first through hole is located on one side of the sealed box and the third through hole is located on the other side of the sealed box, and the packaging tube extends into the sealed box from the first through hole, and the height positions of the first through hole and the third through hole correspond to each other, so that the air guide tube extends into the packaging tube from the third through hole.

2. The airtight packaging device according to claim 1, characterized in that: The gas supply device also includes a gas control device connected to the gas source; and a gas outlet is provided on the sealed box.

3. The airtight packaging device according to claim 1, characterized in that: It also includes a gas detection device, and a probe of the gas detection device is arranged in the sealed box.

4. The airtight packaging device according to claim 1, characterized in that: The sealed box has a visible window or the sealed box is a transparent structure.

5. The airtight packaging device according to claim 1, characterized in that: The airtight packaging device also includes a curing device.

6. A method for airtight packaging of an optical fiber sensor, for realizing an airtight packaging structure of an optical fiber sensor, characterized in that: The packaging structure includes a packaging tube, an optical fiber sensor, packaging gas and a sealing structure; the main body of the optical fiber sensor is located in the packaging tube, at least one end of the optical fiber sensor is located outside the packaging tube, the sealing structure is arranged at the tube mouth of the packaging tube, and the interior of the packaging tube is filled with packaging gas; the airtight packaging method includes the following steps: Preparation stage: insert the optical fiber sensor into the packaging tube, make the tube opening of the packaging tube communicate with the cavity in the sealing box, and extend one end of the air guide tube into the packaging tube; Gas filling: Fill the sealed box cavity with packaging gas, and fill the packaging tube with packaging gas through the air guide tube; Tube mouth sealing: Pull the capillary air guide tube out of the packaging tube and seal the tube mouth of the packaging tube; One end of the packaging tube is closed and the other end is open; the sealed box is provided with a first through hole and a third through hole, the first through hole is located on one side of the sealed box, the third through hole is located on the other side of the sealed box, and the height positions of the first through hole and the third through hole correspond to each other; In the preparation stage, one end of the packaging tube is inserted into the sealing box through the first through hole, so that the tube opening of the packaging tube is connected with the cavity in the sealing box, and a section of the air guide tube is extended into the packaging tube through the third through hole; During the gas filling, a part of the packaging gas enters the cavity of the sealing box through the gas inlet, and another part of the packaging gas is introduced into the packaging tube through the gas guide tube.

7. The airtight packaging method according to claim 6, characterized in that: During the gas filling process, the gas detection device is used to monitor the packaging gas concentration in the sealed box in real time; after the packaging gas concentration reaches the requirement, the pipe mouth is sealed.

8. The airtight packaging method according to claim 6, characterized in that: After the tube opening of the packaging tube is sealed with sealant, a curing process is also performed.

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