A long-pulling taper micro-nano optical fiber gas sensing probe packaging device and method

Abstract

The application relates to a long-pulling-tapered micro-nano optical fiber gas sensing probe packaging device and method. The packaging device comprises an adjustable optical fiber clamp assembly and a packaging air chamber. The adjustable optical fiber clamp assembly comprises a fixed clamping groove, a movable adjusting frame and an optical fiber pressing block, the packaging air chamber comprises a packaging top cover and a packaging base, a gap between the packaging top cover and the packaging base is filled with a sealing rubber pad, and dustproof air-permeable films are arranged on upper and lower surfaces. The application also discloses a micro-nano optical fiber packaging method based on the above packaging device. The application has the beneficial effects that the problems of high operation difficulty and uncontrollable result of the existing micro-nano optical fiber packaging method are solved, the operation is simple and reliable, the long-pulling-tapered micro-nano optical fiber packaging success rate is improved, the matching problem of the packaging structure length and the pulling-tapered parameter is solved, the packaging structure can be universal under different pulling-tapered parameters, the micro-nano optical fiber after packaging is in a good and stable air chamber environment, and the application is suitable for the packaging of a micro-nano optical fiber gas sensing probe.

Description

Technical Field

[0001] This invention belongs to the field of micro-nano fiber optic sensing technology, specifically relating to a packaging device and method for a long tapered micro-nano fiber optic gas sensing probe. Background Technology

[0002] In recent years, fiber optic sensing technology has experienced rapid development and widespread application in the field of gas detection due to its advantages such as fast response speed, strong anti-electromagnetic interference capability, high sensitivity, and low power consumption. With the emergence of fiber optic micro / nano technology, how to fabricate micro / nano fibers using conventional optical fibers and utilize them to detect the composition and concentration of gases in space has become a new research hotspot. On the one hand, the stable and reliable tapered micro / nano fiber systems gradually being introduced both domestically and internationally have solved the problem of micro / nano fiber fabrication, providing fundamental support for the performance and application research of micro / nano fibers. On the other hand, micro / nano fibers face problems such as complex packaging operations, poor packaging effects, and low packaging success rates during the packaging process. Especially when packaging long tapered micro / nano fibers, the influence of external disturbances and human operation on uncertainties is more pronounced, resulting in a higher packaging failure rate. In common encapsulation methods, micro / nano optical fibers are fixed to the optical fixture platform of a tapered system by fiber clamps. The micro / nano optical fibers are adjusted by fine-tuning the fiber clamp platform to achieve the encapsulation state. Then, the encapsulation substrate is placed on the encapsulation platform of the tapered system. By controlling the height of the encapsulation platform, the encapsulation substrate is raised to the vicinity of the micro / nano optical fiber to be encapsulated. This brings the upper surface of the encapsulation substrate close to, contacts, and fixes the unheated and unstretched initial optical fiber between the two fiber clamp platforms. The fixing clamps that fix the initial optical fiber on the fiber clamp platform of the tapered system are removed, and the lower surface of the encapsulation top cover is fixed to the initial optical fiber in the same way, thus completing the encapsulation of the micro / nano optical fiber.

[0003] While the aforementioned micro / nano fiber optic packaging method has its own rationale, it still has many areas for improvement in practical applications. Especially when facing the application requirements in the field of micro / nano fiber optic gas sensing, the packaging method reveals the following shortcomings:

[0004] First, the encapsulation method is unclear, and the large movements involved make the micro / nano fibers prone to breakage and damage. Currently available micro / nano fiber encapsulation methods generally use double-sided adhesive to temporarily fix the fibers, requiring the fibers to be flipped during the encapsulation process. In practical applications, it is impossible to control the degree of external interference affecting the flipping operation, making it highly dependent on the operator's judgment and experience. This results in poor operability, a low success rate, and difficulty in promoting its implementation outside of laboratories.

[0005] Secondly, the length requirements for the packaging substrate are strict, and the adaptability of the packaging structure is poor. It is easy to see that the above method for packaging micro / nano fibers requires two basic conditions: the length of the packaging substrate must be less than the inner distance between the two fiber clamping platforms of the tapered system during packaging, and the length of the packaging substrate must be greater than the tapered length of the micro / nano fiber. If the packaging substrate is too long, it will collide and interfere with the fiber clamping platform of the tapered system during the process of being lifted by the packaging platform to the vicinity of the micro / nano fiber, preventing the packaging substrate from contacting the fiber and thus preventing the fiber packaging from being completed. If the packaging substrate is too short, less than the tapered length of the long tapered micro / nano fiber, the packaging structure will ultimately be unable to contact the initial fiber that has not undergone heating and stretching, and the packaging operation will also be impossible. Based on these requirements, an ideal packaging method is to predict and evaluate the inner distance between the fiber clamping platforms and the tapered length after the micro / nano fiber tapering is completed, based on different micro / nano fiber tapering parameters, and design the packaging substrate length accordingly to customize the packaging structure. However, this method is costly and time-consuming, making it almost unusable.

[0006] Third, the internal space of the micro / nano fiber encapsulation structure restricts the fiber, and the structure is not conducive to gas sensing. Common micro / nano fiber encapsulation methods leave the encapsulated micro / nano fiber in a "free-floating" state to prevent it from contacting and adhering to the encapsulation structure, which would affect the fiber's conduction characteristics and optical signal transmission, or even break the fiber. However, the encapsulation space is limited, and during the pre-encapsulation stage, the fiber is easily broken due to over-adjustment, especially with long tapered micro / nano fibers. To address this issue, some solutions use low-refractive-index materials to fabricate the encapsulation structure, allowing it to contact the micro / nano fiber. While this method reduces the adjustment requirements of the micro / nano fiber to some extent, it reduces the effective contact area between the micro / nano fiber and the gas to be detected, thus lowering the sensitivity of the gas sensing probe.

[0007] In response to the application needs of micro- and nano-fibers in the field of gas sensing, and the shortcomings exposed by existing packaging methods, this invention proposes a packaging method that can effectively meet the packaging needs of micro- and nano-fibers of different lengths, especially long tapered micro- and nano-fibers, and provide a safe and reliable gas sensing environment for micro- and nano-fibers. This method is essential for the application and development of micro- and nano-fiber gas sensing technology. Summary of the Invention

[0008] The purpose of this invention is to provide a packaging device and method for a long tapered micro / nano fiber gas sensing probe. By using an adjustable fiber clamp assembly and a packaging gas chamber, the packaging operation requirements for micro / nano fibers are relaxed, thus ensuring the gas detection performance of the micro / nano fibers.

[0009] The above-mentioned objectives of the present invention are mainly achieved through the following technical solutions:

[0010] A packaging device for a long tapered micro / nano fiber optic gas sensing probe includes an adjustable fiber clamp assembly and a packaging gas chamber, wherein...

[0011] The adjustable fiber optic clamp assembly includes a fixed slot, a movable adjustment frame, and a pressure block. The fixed slot has a groove, and two movable adjustment frames are installed in the groove and can slide axially within the groove. The movable adjustment frame includes a horizontal adjustment arm and a fiber optic support platform. The movable adjustment frame is connected to the fixed slot through the horizontal adjustment arm. The surface of the fiber optic support platform is engraved with a first fiber optic groove, and the pressure block presses on the first fiber optic groove to achieve the positioning and clamping of the fiber optic cable.

[0012] The encapsulation chamber includes an encapsulation top cover and an encapsulation base. The encapsulation top cover and the encapsulation base are provided with multiple through holes. A sealing rubber gasket is provided on the lower surface of the encapsulation top cover. The encapsulation base is provided with an optical fiber inlet and outlet. The optical fiber inlet and outlet include a dispensing groove and a second optical fiber groove provided on the dispensing groove. The encapsulation top cover is provided with a protrusion corresponding to the dispensing groove, which is used to fit into the dispensing groove after the encapsulation top cover and the encapsulation base are combined.

[0013] The horizontal adjusting arm is equipped with a sliding guide rail, and the fixing screw passes through the sliding guide rail and is screwed into the thread on the inner surface of the fixing slot groove to fix the movable adjusting frame.

[0014] The upper surface of the packaging top cover and the lower surface of the packaging substrate are covered with a dustproof and breathable membrane.

[0015] A method for packaging a long tapered micro / nano fiber optic gas sensing probe, using the aforementioned packaging device, specifically includes the following steps:

[0016] (1) The micro-nano fiber to be packaged is prepared by tapering using a fiber mechanical tapering system. The quality of the mechanically tapered micro-nano fiber is detected in real time by a light source (1) and a photodetector (4).

[0017] (2) If the quality of the micro / nano fiber passes the test, the micro / nano fiber gas sensing probe is packaged, specifically including the following steps:

[0018] (21) Place the packaging substrate on the packaging lifting platform of the mechanical tapering system and fix it. Adjust the vertical height of the packaging lifting platform so that the unstretched initial optical fibers on both sides of the micro-nano optical fiber are suspended in the second optical fiber groove of the optical fiber inlet and outlet glue groove.

[0019] (22) Wet the initial optical fiber with glue, and then cure it to fix the initial optical fiber on the encapsulation substrate.

[0020] (23) Remove the fiber clamping block from the fiber clamping platform, seal the top cover, and completely seal the fiber inlet and outlet to obtain the gas sensing probe.

[0021] In step (2), during the encapsulation operation, the light source and photodetector are kept on and connected. The transmission loss of the micro-nano fiber is monitored in real time through the light source and photodetector to ensure that the micro-nano fiber is not damaged or destroyed during the encapsulation process.

[0022] In step (2), if the inner spacing of the fiber optic clamping platform cannot accommodate the length of the long tapered fiber packaging substrate, the initial fiber needs to be separated from the fiber optic clamping platform, and the inner spacing of the fiber optic clamping platform needs to be adjusted. The specific steps are as follows:

[0023] (211) Adjust the length of the movable adjustment frame so that the adjustable fiber optic clamp assembly can be placed close to the inside of the fiber optic clamp platform.

[0024] (212) Place the adjustable fiber clamp assembly obtained in step (211) on the packaging lifting platform of the mechanical tapering system and fix it. Adjust the vertical height of the packaging lifting platform so that the upper surface of the fiber support platform contacts the initial fiber and is placed on the first fiber groove. Press and fix it by the pressure block.

[0025] (213) Remove the fiber clamping block of the mechanical tapered system, take out the fiber from the third fiber groove on the upper surface of the fiber clamping platform, and move the fiber clamping platform outward.

[0026] (214) After adjusting the inner spacing of the fiber clamping platform, place the initial fiber back into the third fiber groove of the fiber clamping platform, press and fix it with the fiber clamping block, remove the clamping block on the fiber support platform, control the packaging lifting platform to descend and remove the adjustable clamping assembly.

[0027] (215) Observe the appearance of the micro-nano fiber. If the micro-nano fiber is loose, control the fiber clamp platform to step outward to straighten the micro-nano fiber until the looseness of the micro-nano fiber cannot be observed with the naked eye, and the adjustment is completed.

[0028] The adjustable frame is equipped with millimeter scales. When the adjustable fiber optic clamp assembly is placed close to the inside of the fiber optic clamp platform, the length of the micro-nano fiber region that has been heated and stretched in the middle can be calculated through the millimeter scales, or the tapered length displayed by the mechanical tapering system can be used to adjust the overall length of the adjustable fiber optic clamp assembly.

[0029] In step (213), the inner packaging spacing after the fiber optic clamping platform moves outward is the horizontal length of the packaging substrate plus 10-30 mm.

[0030] In step (2), the adhesive is a UV adhesive;

[0031] The top cover (61) and the base (62) of the package are provided with threaded holes and are fixed by screws. The screws are tightened in the diagonal direction from the inside to the outside.

[0032] A long tapered micro / nano fiber gas sensing probe is prepared according to the above-described packaging method.

[0033] Compared with the prior art, the present invention has at least the following beneficial effects:

[0034] (1) This invention relates to a long tapered micro / nano fiber packaging device. The device has a simple structure and low manufacturing cost. The method of packaging micro / nano fibers based on the above device has a small range of operation on the micro / nano fiber during the packaging process, the long tapered micro / nano fiber is not easy to break or be damaged, and the packaging success rate is high.

[0035] (2) This invention overcomes the limitation on the length of the packaging substrate in existing micro-nano fiber packaging methods, unifies the packaging structure, and eliminates the need to consider whether the inner spacing of the fiber clamping platform of the tapering system is greater than the length of the packaging substrate after the fiber is drawn, or whether the length of the packaging substrate is less than the spacing of the fiber clamping platform and can fully accommodate the length of the micro-nano fiber tapered area. It fundamentally solves the matching problem between the length of the packaging structure, the length of the micro-nano fiber tapered area and the inner spacing of the fiber clamping platform of the tapering system, and is applicable to micro-nano fiber packaging under different tapering parameters, reducing the requirements for tapering equipment and operators.

[0036] (3) The micro-nano optical fiber encapsulated in this invention is in a gas chamber environment that allows for free gas exchange with the outside world, thus ensuring the gas detection performance of the micro-nano optical fiber.

[0037] (4) In the preferred embodiment of the present invention, a dustproof and breathable membrane is provided on the outside of the packaging structure to isolate impurities such as dust and debris in the harsh gas detection environment, avoid contaminating the micro-nano optical fiber and affecting the sensing performance, and facilitate the application and promotion of micro-nano optical fiber in the field of gas sensing probes. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of a packaging device for a long tapered micro / nano fiber optic gas sensing probe according to the present invention;

[0039] Figure 2 This is a schematic diagram of the adjustable fiber optic clamp assembly structure of the present invention;

[0040] Figure 3 This is a schematic diagram of the encapsulation chamber structure of the present invention. Detailed Implementation

[0041] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments:

[0042] like Figure 1As shown, the present invention provides a packaging device for a long tapered micro / nano fiber gas sensing probe, which includes an adjustable fiber clamp assembly and a packaging gas chamber. The adjustable fiber clamp assembly includes a fixed slot 51, a pair of movable adjustment frames 52, and a pair of magnetic pressure blocks 53.

[0043] like Figure 2 As shown, the fixed slot 51 has a rectangular groove, the width of which matches the width of the movable adjustment frame 52. Two movable adjustment frames 52 are symmetrically installed opposite each other in the groove and can be freely adjusted along the groove axis. The movable adjustment frame 52 includes a horizontal adjustment arm and an optical fiber support platform. The horizontal adjustment arm has a through sliding guide rail, the width of which allows the fixing screw to pass through. The fixing screw is tightened with the thread on the inner surface of the groove of the fixed slot 51 to fix the movable adjustment frame 52. The front of the horizontal adjustment arm is provided with millimeter scale to adjust the overall length of the optical fiber clamp assembly, which is less than the maximum distance between the tapered system packaging platform and the micro-nano optical fiber on the optical fiber clamp platform in the vertical direction. The upper surface of the optical fiber support platform of the movable adjustment frame 52 is engraved with a first optical fiber groove that matches the diameter of the unstretched initial optical fiber. At the same time, this surface is magnetic and can be used in conjunction with the magnetic pressure block 53 to realize the positioning and clamping of the optical fiber. The front of the fixed slot 51 is provided with a fixing hole 54 for fixing to the packaging lifting platform 32 of the optical fiber mechanical tapering system, and the two are fixed with screws.

[0044] When the movable adjustment frame 52 of the adjustable fiber optic clamp assembly is fully extended, the maximum horizontal length of the adjustable fiber optic clamp assembly can meet the inner spacing of the fiber optic clamp platform under the maximum taper length of the fiber optic tapering system.

[0045] The vertical height of the adjustable fiber optic clamp assembly should meet the installation requirements in the vertical direction, that is, it should be less than the maximum distance between the tapered system packaging platform and the micro / nano fiber on the fiber optic clamp platform in the vertical direction.

[0046] like Figure 3 As shown, the encapsulation chamber includes an encapsulation top cover 61 and an encapsulation base 62. The encapsulation top cover 61 is made of Invar steel with a main frame. The upper surface of the encapsulation top cover 61 is covered with a dustproof and breathable membrane. A sealing rubber gasket 63 is attached around the lower surface of the encapsulation top cover 61 along the frame. The encapsulation base 62 is also made of Invar steel with a main frame. The encapsulation top cover 61 and the encapsulation base 62 have several symmetrically and evenly distributed fixing threaded holes. The lower surface of the encapsulation base 62 is also covered with a dustproof and breathable membrane.

[0047] On both sides of the encapsulation base 62, where the encapsulation chamber contacts and is fixed to the unstretched initial optical fiber 2 during encapsulation, there is an optical fiber inlet / outlet 621 for the encapsulation chamber. The optical fiber inlet / outlet 621 consists of a dispensing groove and a second optical fiber groove in the center of the dispensing groove. The second optical fiber groove is narrow and is used for positioning and fixing the unstretched initial optical fiber 2. There are corresponding protrusions on the lower surface of the encapsulation top cover 61. After the encapsulation top cover 61 and the encapsulation base 62 are combined, they can fit into the dispensing groove. The sealing rubber gasket 63 pasted on the lower surface of the encapsulation top cover 61 can leave a certain gap after the two fit together, leaving space for the optical fiber to be fixed by dispensing, which becomes the inlet / outlet hole for the optical fiber to enter and exit the encapsulation chamber. The overall structure described above forms a box-shaped encapsulation chamber with a certain amount of free space inside.

[0048] The micro-nano fiber optic gas sensing probe packaging method provided by the present invention is mainly divided into two parts: adjusting the fiber optic clamp assembly and packaging the micro-nano fiber optic gas sensing probe.

[0049] The micro-nano optical fiber to be packaged is prepared by the optical fiber mechanical tapering system. The flame of the mechanical tapering system is removed, and the dustproof protective cover of the micro-nano optical fiber used in the tapering process is opened. The unstretched initial optical fibers 2 on both sides of the micro-nano optical fiber are placed in the third optical fiber groove of the optical fiber clamping platform 31 of the mechanical tapering system. The upper surface of the optical fiber clamping platform 31 is made of magnetic material, and the optical fiber pressing block 33 is magnetic. The two can fit tightly together to press and fix the unstretched initial optical fiber 2.

[0050] Under bright, sufficient light, observe the overall morphology of the micro / nano fiber to ensure its integrity and absence of breaks. During the mechanical tapering process, light source 1 and photodetector 4 are connected to both ends of the micro / nano fiber. At this point, the quality of the micro / nano fiber is further assessed by detecting the output light intensity. Ensure that the transmission loss level of the micro / nano fiber meets the requirements before proceeding with the subsequent encapsulation operation. During the encapsulation operation, light source 1 and photodetector 4 remain on and connected. Throughout the process, the transmission loss of the micro / nano fiber is monitored in real time through light source 1 and photodetector 4 to ensure that the micro / nano fiber is not damaged or destroyed during the encapsulation process.

[0051] The control software matched with the mechanical tapering system displays the changes of multiple parameters during the tapering process, such as tapering length, tapering spacing, etc. Record the value of the tapering spacing, i.e., the inner spacing of the optical fiber clamp platform 31 of the mechanical tapering system. When this spacing cannot accommodate the length of the long tapered optical fiber packaging substrate 62, the unstretched initial optical fiber 2 needs to be separated from the optical fiber clamp platform 31, and the mechanical tapering system control software is used to further adjust the inner spacing of the optical fiber clamp platform 31. Said separation process requires an adjustable optical fiber clamp assembly to temporarily place the optical fiber. To minimize the uncertainty caused by the transfer operation of the optical fiber between the optical fiber clamp platform 31 and the adjustable optical fiber clamp assembly, the adjustable optical fiber clamp assembly needs to be placed closely against the inner side of the optical fiber clamp platform 31 to reduce the optical fiber transfer distance. In addition, the purpose of this operation is also that after the optical fiber tapering is completed, the length of the heated and stretched micro-nano optical fiber tapered region in the middle cannot be directly measured, and the boundary of the tapered region is difficult to distinguish with the naked eye. However, the optical fiber near the inner side of the optical fiber clamp platform 31 must be the unstretched initial optical fiber 2, which can be in contact with the packaging structure. During operation, the length of the fixing clamping groove 51 of the adjustable optical fiber clamp assembly is subtracted from the inner spacing of said optical fiber clamp platform 31, and after dividing this length by 2, the length that the movable adjusting frames 52 on both sides of the adjustable optical fiber clamp platform each need to extend out of the fixing clamping groove 51 is obtained. The millimeter scale on the front side of the movable adjusting frame 52 of the adjustable optical fiber clamp assembly enables precise adjustment of the overall length of the adjustable optical fiber clamp assembly. At this time, said adjustable optical fiber clamp assembly can be placed closely against the inner side of the optical fiber clamp platform 31, and said adjustable optical fiber clamp assembly can also be placed in advance to reconfirm this length.

[0052] The adjustable optical fiber clamp assembly with adjusted length is placed centrally on the packaging lifting platform 32 of the mechanical tapering system, and the fixing clamping holes 54 of the adjustable optical fiber clamp assembly are fixed with screws. The vertical height of the packaging lifting platform 32 is controlled by the tapering system control software, so that the upper surface of the optical fiber supporting platform of the movable adjusting frame 52 of the adjustable optical fiber clamp assembly contacts the unstretched initial optical fiber 2, and the optical fiber is placed on its first optical fiber groove, and then compressed and fixed by the magnetic pressing block 53 of the adjustable optical fiber clamp assembly. In this embodiment, when adjusting the vertical height of the packaging lifting platform 32, the principle of coarse adjustment first followed by fine adjustment is adopted, and when the packaging lifting platform 32 is about to contact the unstretched initial optical fiber 2, smaller step heights are used to adjust the packaging lifting platform 32.

[0053] Remove the fiber clamp 33 from the mechanical tapering system and manually remove the fiber from the third fiber groove on the upper surface of the fiber clamping platform 31. This prevents incomplete separation of the fiber from the fiber clamping platform 31, which could lead to breakage during subsequent adjustments. At this point, the fiber clamping platform 31 can be freely adjusted outwards without pulling on the fiber. Continue using the mechanical tapering system control software to control the outward movement of the fiber clamping platform 31. Determine the inner spacing of the fiber clamping platform 31 based on the length of the encapsulation substrate 62. This spacing is the horizontal length of the encapsulation substrate 62 plus 10–30 mm, which is equivalent to 5–15 mm of operating space on each side of the encapsulation substrate.

[0054] After the fiber optic clamping platform 31 is adjusted, the initial unstretched optical fibers 2 on both sides are placed back into the third fiber optic groove of the fiber optic clamping platform 31 and pressed and fixed with fiber optic clamping blocks 33. To enhance the fixing strength, there are two clamping blocks on each side. Remove the magnetic clamping blocks 53 of the adjustable fiber optic clamping assembly to completely separate the optical fiber from it, and control the packaging lifting platform 32 to fully descend to its original position, and remove the adjustable clamping assembly.

[0055] Under bright and sufficient light, observe the appearance of the micro-nano fiber. If the micro-nano fiber is obviously loose, the fiber clamp platform 31 needs to be adjusted outward in small steps using the tapered system control software to straighten the micro-nano fiber until the looseness of the micro-nano fiber can no longer be observed by the naked eye, or to ensure that the looseness will not cause the micro-nano fiber to stick to the encapsulation gas chamber.

[0056] After adjusting the fiber optic clamp platform, the micro / nano fiber gas sensing probe is packaged. In this embodiment, in addition to using the packaging chamber, tools and materials such as tweezers, Allen wrenches, and UV curing adhesive are also required for the packaging operation.

[0057] Take a clean and intact encapsulation chamber and check to ensure that there are no impurities or debris on the dustproof and breathable membranes attached to the encapsulation top cover 61 and the encapsulation base 62 to avoid contamination of the micro-nano optical fibers inside the chamber after encapsulation. Place the encapsulation base 62 centered on the encapsulation lifting platform 32 of the mechanical tapering system and tighten it with screws. Control the vertical height of the encapsulation lifting platform 32 through the tapering system control software to make the unstretched initial optical fibers 2 on both sides of the micro-nano optical fibers contact the optical fiber inlets / outlets 621 on both sides of the encapsulation base. Make further fine adjustments to suspend the optical fibers in the second optical fiber groove in the center of the adhesive dispensing grooves on both sides. Use a fine needle to pick up an appropriate amount of UV adhesive to wet the optical fibers. During operation, avoid pulling the optical fibers too much to prevent breakage of the micro-nano optical fibers. The amount of adhesive should be appropriate to avoid filling too much and making it difficult to close the cover, and also to prevent the adhesive from contaminating other areas. Use a UV lamp to irradiate and cure. In this embodiment, the curing time is 5 minutes. After confirming that the curing is complete, remove the UV lamp. At this time, the unstretched initial optical fibers 2 have been completely fixed to the encapsulation base 62 by the UV adhesive. Seal the top cover 61, align the threaded holes between the top cover 61 and the base 62, and install the screws. In this embodiment, all screws should be tightened gradually and evenly from the inside out in a diagonal direction to avoid gaps in the sealing rubber gasket 63 due to uneven force, which would result in incomplete dust prevention. Apply a small amount of UV adhesive to the outer surface of the fiber optic inlet / outlet 621 on both sides of the encapsulation chamber to completely seal the holes. Cure the adhesive by irradiating it from the side with a UV lamp for 10 minutes until the adhesive on the surface and in the holes is completely cured. Then remove all the fiber clamps 33 from the fiber optic clamp platform 31, disconnect the free optical fibers at both ends of the encapsulation from the light source 1 and the photodetector 4, loosen the screws fixing the encapsulation chamber on the encapsulation lifting platform 32, and remove the micro-nano fiber optic gas sensing probe to complete all operations.

[0058] The above description is only the best specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the protection scope of the present invention.

[0059] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A packaging device for a long tapered micro / nano fiber optic gas sensing probe, characterized in that: Includes an adjustable fiber optic clamp assembly and an encapsulation gas chamber, wherein, The adjustable fiber clamp assembly includes a fixed slot (51), a movable adjustment frame (52), and a pressure block (53). The fixed slot (51) is provided with a groove, and two movable adjustment frames (52) are installed in the groove and can slide axially in the groove. The movable adjustment frame (52) includes a horizontal adjustment arm and a fiber support platform. The movable adjustment frame (52) is connected to the fixed slot (51) through the horizontal adjustment arm. The surface of the fiber support platform is engraved with a first fiber groove, and the pressure block (53) presses on the first fiber groove to realize the positioning and clamping of the fiber. The encapsulation chamber includes an encapsulation top cover (61) and an encapsulation base (62). The encapsulation top cover (61) and the encapsulation base (62) are provided with multiple through holes. A sealing rubber gasket (63) is provided on the lower surface of the encapsulation top cover (61). An optical fiber inlet / outlet (621) is provided on the encapsulation base (62). The optical fiber inlet / outlet (621) includes a dispensing groove and a second optical fiber groove provided on the dispensing groove. A protrusion corresponding to the dispensing groove is provided on the encapsulation top cover (61) for fitting into the dispensing groove after the encapsulation top cover (61) and the encapsulation base (62) are combined. When the inner spacing of the fiber clamp platform (31) cannot accommodate the length of the long tapered fiber packaging substrate (62), the unstretched initial fiber (2) needs to be separated from the fiber clamp platform (31). The fiber is temporarily placed using an adjustable fiber clamp assembly. The adjustable fiber clamp assembly with the length adjusted is placed in the center on the packaging lifting platform (32) of the mechanical tapering system. After the fiber clamp platform (31) is adjusted, the gas sensing probe of the micro-nano fiber is packaged. The packaging substrate (62) is placed in the center on the packaging lifting platform (32) of the mechanical tapering system. The vertical height of the packaging lifting platform (32) is controlled by the tapering system control software so that the unstretched initial fiber (2) on both sides of the micro-nano fiber contacts the fiber inlet and outlet (621) on both sides of the packaging substrate. Further fine-tuning is performed so that the fiber is suspended in the second fiber groove in the center of the glue dispensing groove on both sides.

2. The packaging device for a long tapered micro / nano fiber optic gas sensing probe according to claim 1, characterized in that: The horizontal adjusting arm is provided with a sliding guide rail, and the fixing screw passes through the sliding guide rail and is screwed into the thread on the inner surface of the fixing slot (51) for fixing the movable adjusting frame (52).

3. The packaging device for a long tapered micro / nano fiber optic gas sensing probe according to claim 1, characterized in that: The upper surface of the encapsulation top cover (61) and the lower surface of the encapsulation base (62) are covered with a dustproof and breathable membrane.

4. A method for packaging a long tapered micro / nano fiber optic gas sensing probe, characterized in that: The encapsulation process using the long tapered micro / nano fiber optic gas sensing probe encapsulation device as described in any one of claims 1 to 3 specifically includes the following steps: (1) The micro-nano fiber to be packaged is prepared by tapering using a fiber mechanical tapering system. The quality of the mechanically tapered micro-nano fiber is detected in real time by a light source (1) and a photodetector (4). (2) If the quality of the micro / nano fiber passes the test, the micro / nano fiber gas sensing probe is packaged, specifically including the following steps: (21) Place the encapsulation substrate (62) on the encapsulation lifting platform (32) of the mechanical tapering system and fix it. Adjust the vertical height of the encapsulation lifting platform (32) so that the unstretched initial optical fibers (2) on both sides of the micro-nano optical fiber are suspended in the second optical fiber groove of the glue dispensing groove of the optical fiber inlet and outlet (621). (22) Wet the initial optical fiber (2) with glue, and then cure it to fix the initial optical fiber (2) on the encapsulation substrate (62); (23) Remove the fiber clamp (33) from the fiber clamp platform (31), seal the top cover (61) and completely seal the fiber inlet and outlet (621) to obtain the gas sensing probe. In step (2), if the inner spacing of the fiber clamping platform (31) cannot accommodate the length of the long tapered fiber encapsulation substrate (62), the initial fiber (2) needs to be separated from the fiber clamping platform (31), and the inner spacing of the fiber clamping platform (31) needs to be adjusted. The specific steps are as follows: (211) Adjust the length of the movable adjustment frame (52) so that the adjustable fiber optic clamp assembly can be placed close to the inside of the fiber optic clamp platform (31); (212) Place the adjustable fiber clamp assembly obtained in step (211) on the packaging lifting platform (32) of the mechanical tapered system and fix it. Adjust the vertical height of the packaging lifting platform (32) so that the upper surface of the fiber support platform contacts the initial fiber (2) and is placed on the first fiber groove. Press and fix it by the pressure block (53). (213) Remove the fiber clamping block (33) of the mechanical tapering system, take out the fiber from the third fiber groove on the upper surface of the fiber clamping platform (31), and move the fiber clamping platform (31) outward; (214) After adjusting the inner spacing of the fiber clamping platform (31) to the correct position, place the initial fiber (2) back into the third fiber groove of the fiber clamping platform (31), press and fix it with the fiber clamping block (33), remove the clamping block (53) on the fiber support platform, control the packaging lifting platform (32) to descend and remove the adjustable clamping assembly. (215) Observe the appearance of the micro-nano fiber. If the micro-nano fiber is loose, control the fiber clamp platform (31) to step outward to straighten the micro-nano fiber until the looseness of the micro-nano fiber cannot be observed with the naked eye, and complete the adjustment.

5. The packaging method for a long tapered micro / nano fiber optic gas sensing probe according to claim 4, characterized in that: In step (2), during the encapsulation operation, the light source (1) and the photodetector (4) are kept on and connected. The transmission loss of the micro-nano fiber is monitored in real time through the light source (1) and the photodetector (4) to ensure that the micro-nano fiber is not damaged or destroyed during the encapsulation process.

6. The packaging method for a long tapered micro / nano fiber optic gas sensing probe according to claim 4, characterized in that: The movable adjustment frame (52) is provided with millimeter scales. When the adjustable fiber optic clamp assembly is placed close to the inside of the fiber optic clamp platform (31), the overall length of the adjustable fiber optic clamp assembly can be adjusted by the tapered length displayed by the mechanical tapered system.

7. The packaging method for a long tapered micro / nano fiber optic gas sensing probe according to claim 4, characterized in that: In step (213), the inner packaging spacing after the fiber optic clamping platform (31) moves outward is the horizontal length of the packaging substrate (62) plus 10~30mm.

8. The packaging method for a long tapered micro / nano fiber gas sensing probe according to claim 4, characterized in that: In step (2), the adhesive is a UV adhesive; The top cover (61) and the base (62) of the package are provided with threaded holes and are fixed by screws. The screws are tightened in the diagonal direction from the inside to the outside.

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