A semi-open fixing structure for an optical fiber displacement sensor and an optical fiber displacement sensor

Abstract

The disclosure provides a semi-open fixing structure for an optical fiber displacement sensor and the optical fiber displacement sensor. The fixing structure body has a radial matching surface and a mounting end surface. A matching groove is arranged on the radial matching surface. An inner sleeve extends into the matching groove from an opening on one side of the radial matching surface, and the center axes of the two coincide. A point gluing groove is arranged on the arc-shaped groove wall of the matching groove. The point gluing groove extends along the circumference of the arc surface of the matching groove. The matching groove is also provided with a point gluing application surface. An opening at the point gluing application surface is used for point gluing adhesive. The point gluing groove is used to accommodate the adhesive overflowing between the outer wall of the inner sleeve and the arc-shaped groove wall during the gluing process. The disclosure effectively accommodates the overflowing adhesive by arranging the point gluing groove on the arc-shaped groove wall of the matching groove, avoids contaminating other components, and improves the installation quality and reliability of the sensor.

Description

Technical Field

[0001] This application relates to the field of fiber optic sensing technology, specifically to a semi-open fixing structure for a fiber optic displacement sensor and a fiber optic displacement sensor, and more particularly to an installation fixing structure that collects adhesive overflowing during bonding by setting an adhesive groove on the groove wall of the mating groove on the radial mating surface of the fixing structure. Background Technology

[0002] In a typical fiber optic displacement sensor structure, the fixing structure is assembled with the tail-end fixing section via a mating groove. Specifically, the inner sleeve extends into the mating groove from an opening on one side of the radial mating surface, and adhesive is applied between its outer wall and the arc-shaped groove wall to achieve a tight fit. The adhesive can be applied through an opening in the mating groove located at the adhesive application surface. While this semi-open groove structure provides a convenient assembly path, it also introduces potential problems. During actual installation, operators often apply a sufficient amount of adhesive into the groove to ensure bonding strength. However, because the mating clearance between the outer wall of the inner sleeve and the arc-shaped groove wall is extremely narrow, the effective space for accommodating the adhesive is very limited. Excess adhesive has nowhere to go during pressing and can only overflow from the groove opening and both sides. The overflowing adhesive may flow onto the sensor housing, optical window, and even the interference optical path area, potentially not only accidentally fixing moving parts that should not be bonded but also contaminating the optical interface and directly degrading the quality of the interference signal. More importantly, because the curved wall of the mating groove is a continuous arc surface with no form of adhesive buffer or guiding structure, the adhesive overflow behavior is random—the direction and amount of overflow are uncontrollable for each installation. This leads to significant differences in adhesive layer thickness and residual stress distribution between different operators, and even among multiple installations by the same operator. For white light interferometry, this uncertainty introduced during installation ultimately translates into a random shift in the initial phase of the interferometer cavity, severely compromising the measurement consistency and long-term stability of the sensor during mass production.

[0003] In summary, how to provide controllable storage space for excess adhesive in a mating groove structure, and eliminate the pollution and uncertainty caused by adhesive overflow from the source, has become a technical problem that urgently needs to be solved in this field.

[0004] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this application and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this application. Utility Model Content

[0005] To address one or more of the aforementioned technical problems, this disclosure provides a semi-open fixing structure for fiber optic displacement sensors and a fiber optic displacement sensor. The core objective is to provide a dispensing groove on the arc-shaped groove wall of the mating groove on the radial mating surface of the fixing structure, so that excess adhesive during the bonding process can be collected in the dispensing groove, thereby preventing adhesive from overflowing along the groove opening and contaminating other components, and improving the installation quality and reliability of the fiber optic displacement sensor.

[0006] In a first aspect of this disclosure, a semi-open fixing structure for a fiber optic displacement sensor is provided. The fiber optic displacement sensor includes a relative motion component, which includes an inner sleeve and an outer sleeve. The outer sleeve is configured to be fitted over the inner sleeve. The inner wall of the outer sleeve abuts against the outer wall of the inner sleeve to form a relatively sliding structure, and the central axis of the inner sleeve coincides with the central axis of the outer sleeve. The fixing structure includes a fixing structure body having a diameter for fixed connection with the inner sleeve. The device includes a mating surface and an mounting end face for contacting the surface of the object being measured. A mating groove is provided on the radial mating surface. The mating groove is configured to be bonded and fixed to the outer wall of the inner sleeve with an adhesive, and the central axis of the mating groove coincides with the central axis of the inner sleeve. A dispensing groove is provided on the arc-shaped groove wall of the mating groove. The dispensing groove extends circumferentially along the arc surface of the mating groove and is configured to collect adhesive that overflows from between the outer wall of the inner sleeve and the arc-shaped groove wall of the mating groove during the bonding process.

[0007] Furthermore, in some embodiments, the fixing structure body also has an adhesive application surface, which is configured to face opposite to the mounting end face, and the adhesive application surface is also provided with a top opening communicating with the mating groove, the top opening being for an operator to apply adhesive.

[0008] Furthermore, in some embodiments, a portion of the opening of the mating groove is disposed on the radial mating surface, and another portion of the opening of the mating groove is disposed on the dispensing application surface.

[0009] Furthermore, in some embodiments, the dispensing grooves are multiple, distributed at intervals along the radial direction of the mating groove on the arc-shaped groove wall of the mating groove.

[0010] Furthermore, in some embodiments, the cross-sectional shape of the dispensing groove is any one of U-shape, semi-circle, V-shape or rectangle.

[0011] Furthermore, in some embodiments, the depth of the dispensing groove is 0.2 mm to 0.8 mm, and the groove opening width is 0.3 mm to 1.0 mm.

[0012] Furthermore, in some embodiments, the arc-shaped groove wall of the mating groove is adapted to the outer diameter of the inner sleeve, so that the outer wall of the inner sleeve and the arc-shaped groove wall form a close fit.

[0013] Furthermore, in some embodiments, the fixing structure body is made of a metal material or an engineering plastic; the metal material includes any one of stainless steel or aluminum alloy, and the engineering plastic includes any one of PEEK or polycarbonate.

[0014] Furthermore, in some embodiments, the fixing structure body and the inner sleeve are bonded and fixed by adhesive.

[0015] Furthermore, in some embodiments, the mounting end face and the dispensing application surface are not on the same plane.

[0016] Furthermore, in some embodiments, the mating groove has an opening on the radial mating surface for the inner sleeve to extend into, and the mating groove has an opening on the dispensing surface opposite the mounting end face for dispensing adhesive.

[0017] A second aspect of this disclosure also provides an optical fiber displacement sensor comprising the fixing structure as described above.

[0018] Furthermore, in some embodiments, the fiber optic displacement sensor is a white light interferometric MEMS fiber optic displacement sensor.

[0019] The beneficial effects of this disclosure are as follows: In some embodiments, excess adhesive is effectively contained to prevent contamination. For example, by providing dispensing grooves on the arc-shaped groove wall of the mating groove of the fixed structure dispensing application surface, excess adhesive during the bonding process is squeezed into the dispensing groove under pressure, preventing adhesive from overflowing outwards along the groove opening and preventing adhesive from sticking to other sensor components or causing unnecessarily bonded parts to be accidentally fixed. Furthermore, in some embodiments, the dispensing groove layout is reasonable and adapts to the structural characteristics of the mating groove. For example, since the mating groove only has an arc-shaped groove wall (open at the top), it is impossible to open radial dispensing grooves like a complete annular groove. This application extends the dispensing grooves circumferentially along the arc surface of the mating groove and distributes multiple grooves radially at intervals in the bottom area, making full use of the limited arc-shaped groove wall space and achieving effective containment of excess adhesive. Furthermore, in some embodiments, installation is convenient and the dispensing process is simplified. For example, the inner sleeve extends axially into the mating groove from an opening on one side of the radial mating surface. Operators can easily apply adhesive into the groove through the upper opening at the dispensing surface, eliminating the need to insert it from the end, greatly simplifying the on-site installation process and reducing installation difficulty and time costs. Furthermore, in some embodiments, installation quality and consistency are improved. For example, the dispensing groove provides a fixed storage space for excess adhesive, reducing the impact of differences in adhesive application rates among different operators and improving the consistency and reliability of fiber optic displacement sensor installation. Furthermore, in some embodiments, processing is convenient and cost-effective. For example, the dispensing groove is located on the arc-shaped groove wall of the mating groove, simplifying the processing without adding extra parts or assembly steps, making it suitable for mass production. Attached Figure Description

[0020] The above and other features, advantages and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description, wherein: Figure 1 A schematic diagram of a white light interferometric MEMS fiber optic displacement sensor according to an embodiment of the present disclosure is shown; Figure 2 A three-dimensional structural schematic diagram of a semi-open fixing structure according to an embodiment of the present disclosure is shown; Figure 3 A schematic diagram of the mounting structure according to an alternative embodiment of the present disclosure is shown; In the various figures, the same or corresponding reference numerals indicate the same or corresponding parts, including: fixed structure body 100; radial mating surface 110; adhesive application surface 110-2; mating groove 130; arc-shaped groove wall 140; adhesive groove 150; inner sleeve 200; outer sleeve 300; fixed structure at the cable outlet 400; and fixed structure at the tail end 500. Detailed Implementation

[0021] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0022] In the description of embodiments of this disclosure, the term "comprising" and similar terms should be understood as open-ended inclusion, i.e., "including but not limited to". The term "based on" should be understood as "at least partially based on". The term "one embodiment" or "the embodiment" should be understood as "at least one embodiment". The terms "first", "second", etc., may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0023] Generally, when attempting to encapsulate the white-light phase-shifting interference principle into a field-application fiber optic displacement sensor, significant technical obstacles are exposed during actual installation. Fiber optic displacement sensors typically include a fixing structure at the cable exit end and a fixing structure at the cable tail end. Specifically, the radial mating surface of the fixing structure at the cable tail end has a mating groove. An inner sleeve extends into this groove from an opening on one side of the radial mating surface along its axial direction (described radially in some embodiments). The outer wall of the inner sleeve is fixedly connected to the arc-shaped groove wall of the mating groove using adhesive. The adhesive can be applied through an opening located above the mating groove. Because the outer wall of the inner sleeve is essentially in contact with the arc-shaped groove wall, the gap between them can only accommodate a very small amount of adhesive.

[0024] Therefore, the existing installation scheme has technical problems as described above.

[0025] Therefore, there is an urgent need in the field for a semi-open fixing structure for fiber optic displacement sensors that can effectively contain adhesive spilled during the bonding process and prevent adhesive from contaminating other components.

[0026] This disclosure will be explained in more detail with reference to the accompanying drawings. It should be noted that in the embodiments of this disclosure, the term "outgoing cable end" refers to the end closest to the optical fiber or optical cable fixing structure, while "tail end" refers to the other end opposite the outgoing cable end.

[0027] Regarding the basic structure. For example... Figure 1As shown, in some embodiments of this disclosure, the fiber optic displacement sensor includes a relative motion component. The relative motion component includes an inner sleeve 200 and an outer sleeve 300. The outer sleeve 300 is fitted over the inner sleeve 200, and the inner wall of the outer sleeve 300 abuts against the outer wall of the inner sleeve 200 to form a relatively sliding structure. The central axis of the inner sleeve 200 coincides with the central axis of the outer sleeve 300. In some embodiments, the fiber optic displacement sensor further includes a cable exit fixing structure 400 and a tail fixing structure 500; wherein the cable exit fixing structure 400 is used for fixed connection with the outer wall of the outer sleeve, and the tail fixing structure 500 is used for fixed connection with the outer wall of the inner sleeve, both being coaxially arranged with the outer sleeve 300.

[0028] Furthermore, such as Figure 2 As shown, the fixing structure includes a fixing structure body 100. The fixing structure body 100 has a radial mating surface 110, an adhesive application surface 110-2, and a mounting end face (not shown, but facing opposite directions to the adhesive application surface 110-2 in the figure). It should be understood that the adhesive application surface 110-2 and the mounting end face (not shown) can be two parallel planes, meaning that one plane faces upwards and the other faces downwards. Further, the inner sleeve 200 can be inserted through the opening of the mating groove 130 on one side of the radial mating surface 110 and fixedly connected by adhesive. The mounting end face (not shown) is used to adhere to the surface of the object being measured. The mounting end face (not shown) and the adhesive application surface 110-2 are not located on the same plane, but are two parallel surfaces facing opposite directions in the figure. The groove opening of another part of the mating groove 130 is provided on the adhesive application surface 110-2 for the operator to apply adhesive.

[0029] Furthermore, a mating groove 130 is provided on the radial mating surface 110. Part of the groove wall of the mating groove 130 is configured to be bonded and fixed to a part of the outer wall of the inner sleeve 200 (generally the lower half shown in the figure) by adhesive. During installation, the inner sleeve 200 extends into the mating groove 130 from the opening on one side of the radial mating surface 110 along its axial direction (i.e., the aforementioned radial direction). Since the lower half of the mating groove 130 is still a semi-circular arc cross-section structure as shown in the figure, its central axis coincides with the central axis of the inner sleeve 200. The outer wall of the inner sleeve 200 is bonded to the arc-shaped groove wall 140 of the mating groove 130 by adhesive, thereby achieving a fixed connection between the fixing structure and the inner sleeve 200.

[0030] Furthermore, such as Figure 2As shown, a dispensing groove 150 is provided on the arc-shaped groove wall 140 of the mating groove 130. The dispensing groove 150 extends circumferentially along the arc-shaped groove wall 140 of the mating groove 130 and is used to collect adhesive that overflows from between the outer wall of the inner sleeve 200 and the arc-shaped groove wall 140 of the mating groove 130 during the bonding process. Specifically, refer to... Figure 2 The so-called mating groove 130 includes a radial direction perpendicular to the radial mating surface 110, and the mating groove 130 has a partial opening on the radial mating surface 110. Obviously, as shown in the figure, another opening of the mating groove 130 is also provided on the dispensing application surface 110-2, and further as shown in the figure, the dispensing groove 150 can be machined from the opening of the groove on the dispensing application surface 110-2, by deepening the sidewall of the mating groove 130 along its circumference (which can be considered as surrounding the central axis of the mating groove 130). Preferably, in some embodiments, the dispensing grooves 150 arranged circumferentially along the mating groove 130 are spaced apart in the radial direction along the mating groove 130. It should also be understood that, see... Figure 2If viewed from the outside towards the radial mating surface 110, the front view of the mating groove 130 can be regarded as a groove with a constant cross-section stretched along the normal direction of the front view (from the radial mating surface 110 towards the inside). The cross-section is U-shaped, and its bottom is semi-circular (the arc protrudes downward). The two ends of the semi-circle are respectively connected to two vertically upward straight line segments as groove walls, and the top forms a horizontal opening. The longitudinal (i.e., the aforementioned radial) extension direction of the groove (matting groove 130) is perpendicular to the front view paper (i.e. the radial mating surface 110 shown, i.e. the front-back direction), and has a certain solid thickness. The groove (matting groove 130) is completely hollowed out and open at the front end face (i.e. the radial mating surface 110, the side facing the observer). Therefore, when projecting the main view, the observer's line of sight can directly penetrate the front opening and clearly see the outline of the inner wall extending backward from the bottom of the groove; furthermore, the inner wall of the mating groove 130 has three sides, in addition to one bottom surface; it also includes a front opening (an opening on the radial mating surface 110) and a top opening (an opening on the dispensing application surface 110-2). It should also be understood that the dispensing groove 150 is set on the side wall of the mating groove 130, that is, the bottom of the dispensing groove 150 is recessed into the solid thickness of the side wall of the mating groove 130 (i.e., excavated in a direction away from the center (central axis) of the main groove of the mating groove 130). In other words, on the inner surface of the side wall of the mating groove 130, there is a U-shaped recessed dispensing groove 150 with an opening facing the inside of the cavity of the mating groove 130; the dispensing groove 150 located in the semi-circular bottom section of the aforementioned mating groove 130 has its opening facing the center of the mating groove 130, and the bottom of the dispensing groove 150 is semi-circularly recessed into the wall thickness of the mating groove 130 for storing adhesive. Furthermore, for ease of processing, the dispensing groove 150 can be excavated circumferentially (relative to the aforementioned radial direction) from one edge of the top opening of the mating groove 130 of the dispensing application surface 110-2 along the side wall of the mating groove 130, starting from a smaller U-shaped recess (dispensing groove 150). Since it is excavated circumferentially, the side openings of the dispensing groove 150 all face the inside of the cavity of the mating groove 130, and end at the other edge of the top opening of the mating groove 130 of the dispensing application surface 110-2, so that the entire cavity of the dispensing groove 150 is also U-shaped when viewed from the aforementioned front view. It should be understood that, in embodiments of this disclosure, when the fixing structure is mounted on the fiber optic displacement sensor (e.g., as...), Figure 3 The tail assembly state shown, or, as... Figure 1 If the fixed structure 500 at the end of the already assembled part is in a certain state, then the central axis of the mating groove 130 can be set to coincide with the central axis of the inner sleeve 200.

[0031] It should be understood that during the adhesive application process, the operator applies adhesive to the inside of the mating groove 130 or the outer wall of the inner sleeve 200, and then inserts the inner sleeve 200 into the mating groove 130 through the opening on one side of the radial mating surface 110. Subsequently, the operator can add more adhesive into the groove through the upper opening of the mating groove 130, ensuring that the adhesive fully fills the space between the outer wall of the inner sleeve 200 and the arc-shaped groove wall 140. During the fixing process, excess adhesive is squeezed out and overflows from the gap between the outer wall of the inner sleeve 200 and the arc-shaped groove wall 140. At this time, the dispensing groove 150 provides a collection space for this overflowing adhesive, preventing the adhesive from overflowing outward along the groove opening of the mating groove 130, thereby preventing the adhesive from sticking to other components of the sensor or causing other parts that do not need to be bonded to be accidentally bonded.

[0032] Regarding the location and arrangement of the dispensing groove: In some embodiments, since the mating groove 130 only has an arc-shaped groove wall in the bottom semicircular section, and this part can be fixed to the outer wall of the inner sleeve 200 by adhesive, while the other section extends vertically upward to the top opening, and this straight section does not participate in the fixation with the inner sleeve 200; therefore, from the perspective of the mating and fixing area, it is not suitable to open the dispensing groove radially like a complete annular groove. Therefore, the dispensing groove 150 is circumferentially extended along the arc-shaped groove wall 140 of the mating groove 130.

[0033] Furthermore, such as Figure 2 As shown, in some embodiments, the dispensing groove 150 is disposed at the bottom region of the arc-shaped groove wall 140 of the mating groove 130 (i.e., the semi-circular section at the bottom of the figure), extending circumferentially along the arc surface of the mating groove 130. This arrangement makes it easier for the adhesive to flow into the dispensing groove 150 under the action of gravity, resulting in better storage. At the same time, since the dispensing groove 150 is located at the bottom of the arc-shaped groove wall 140, even if the amount of adhesive is large, it can be effectively stored and will not overflow into the groove opening of the mating groove 130.

[0034] In an alternative embodiment, there are multiple dispensing channels 150, which are distributed at intervals along the radial direction of the mating channel 130 on the arc-shaped channel wall 140 of the mating channel 130. The arrangement of multiple dispensing channels 150 can collect overflowing adhesive from different locations, further improving the collection effect. It should be understood that the arrangement in this alternative embodiment is merely an alternative method, and its applicable scenarios will be described in some embodiments below.

[0035] Furthermore, the cross-sectional shape of the dispensing groove 150 can be any one of U-shape, semi-circular, V-shape, or rectangular. U-shaped or semi-circular dispensing grooves facilitate the flow and filling of adhesive, avoid dead corners, and ensure that adhesive can flow fully into the dispensing groove 150.

[0036] Furthermore, in some embodiments, the (radial) depth of the mating groove 130 is 10 mm, the depth of the dispensing groove 150 is 0.2 mm to 0.8 mm (preferably 0.5 mm), and the groove width of the dispensing groove 150 is 0.3 mm to 1.0 mm (preferably 0.6 mm).

[0037] Regarding the fit between the mating groove and the inner sleeve: In some embodiments, the arc-shaped groove wall 140 of the mating groove 130 is adapted to the outer wall of the inner sleeve 200. Specifically, the diameter of the inner sleeve 200 is the same as or similar to the inner diameter of the mating groove 130, resulting in a clearance fit. This fit ensures that the inner sleeve 200 can smoothly extend into the mating groove 130 from the opening on one side of the radial mating surface 110, and also ensures that the adhesive can be evenly distributed between the two, forming a reliable adhesive layer.

[0038] Regarding the processing method: It should be understood that the dispensing groove 150 is set on the arc-shaped groove wall 140 of the mating groove 130, and can be directly processed from the groove opening of the mating groove 130 at the dispensing application surface 110-2 along its arc-shaped groove wall 140. Specifically, after processing the mating groove 130, a corresponding tool is used to carve from the groove opening at the top of the mating groove 130 as shown in the figure, and the dispensing groove 150 is processed along the arc-shaped groove wall 140. This processing method is simple and convenient, does not require complex processes and equipment, and is suitable for mass production.

[0039] Regarding the materials and connection methods of the fixing structure: It should be understood that the fixing structure body 100 can be made of metallic materials (such as stainless steel, aluminum alloy) or engineering plastics (such as PEEK, polycarbonate). Metallic materials have high strength and durability, making them suitable for long-term monitoring scenarios; engineering plastics have the advantages of light weight and low cost, making them suitable for weight-sensitive applications. Those skilled in the art should understand from the prior art that metallic materials include stainless steel or aluminum alloy. Stainless steel is preferably austenitic stainless steel (such as SUS304, SUS316L), with a yield strength ≥200MPa, suitable for humid, weakly acidic or alkaline, or medical disinfection environments, and possesses excellent corrosion resistance and ductility; aluminum alloy is preferably 6-series (such as 6061-T6) or 7-series (such as 7075-T6) aerospace-grade hard aluminum alloy, with a tensile strength of up to 300MPa and a density ≤2.8g / cm³, suitable for dynamic fixing scenarios requiring lightweight construction and bearing moderate alternating loads. It should also be understood that engineering plastics include polyetheretherketone (PEEK) or polycarbonate (PC). PEEK is preferably glass fiber or carbon fiber modified and reinforced grade, with a long-term operating temperature up to 160°C, a flexural modulus ≥4 GPa, and X-ray permeability, making it suitable for non-magnetic interference-free fixed structures requiring high-temperature sterilization or medical imaging monitoring. Polycarbonate (PC) is preferably flame-retardant grade (UL94 V-0), with a notched impact strength ≥600 J / m and light transmittance ≥85%, suitable for protective fixed shells requiring transparent observation of internal components or high impact toughness. Therefore, those skilled in the art can rationally select one from the aforementioned set as the body material based on specific load-bearing capacity, operating temperature range, media corrosivity, and manufacturing cost. Specifically, when the fixed structure needs to withstand a dynamic torque of ≥100 N·m and the ambient temperature is ≥120℃, metallic materials (especially stainless steel) are preferred to ensure creep resistance. When the fixed structure needs insulation, wave transmission, or weight reduction (40%~60% weight reduction compared to metal) and the operating temperature is ≤120℃, PEEK or PC are preferred. When metallic materials are selected, the body is integrally formed by precision casting, CNC milling, or powder metallurgy injection molding (MIM), and after molding, it undergoes solution-aging heat treatment to eliminate internal stress. When engineering plastics are selected, the body is formed by injection molding or 3D fused deposition modeling, and after molding, it needs to undergo stress-relief annealing at 150℃~200℃ to ensure dimensional stability.

[0040] Specifically, the fixed structure body 100 and the inner sleeve 200 are bonded together with adhesive. During installation, the operator applies an appropriate amount of adhesive to the inside of the mating groove 130 or the outer wall of the inner sleeve 200, then inserts the inner sleeve 200 into the mating groove 130 through the opening on one side of the radial mating surface 110 and applies appropriate pressure to ensure a tight fit. Subsequently, adhesive can be added to the groove through the upper opening of the mating groove 130. Excess adhesive during pressing or rotating is squeezed into the dispensing groove 150, and the fixation is completed after the adhesive cures.

[0041] Regarding fiber optic displacement sensors, this disclosure also provides a fiber optic displacement sensor comprising the aforementioned fixed structure. Specifically, this fiber optic displacement sensor can be a white light interferometric MEMS fiber optic displacement sensor. By providing a dispensing groove on the arc-shaped groove wall of the mating groove on the dispensing application surface of the fixed structure, the sensor can effectively collect adhesive overflowing during the bonding process, preventing adhesive contamination of other components, thereby ensuring the sensor's measurement accuracy and long-term reliability.

[0042] It should be understood that the above embodiments illustrate a MEMS fiber optic displacement sensor, but other types of fiber optic displacement sensors are also possible, as long as the scenario requires bonding and fixing the fixed structure to the inner sleeve.

[0043] In some alternative embodiments, such as Figure 3 As shown, the tail end of the fiber optic displacement sensor is equipped with the fixing structure mentioned in the above embodiments. However, it should be noted that since a large number of precision optical components are arranged at the cable exit end in this application, the fixing structure at the cable exit end is not preferably the semi-open slot method described above. Generally, the fixing structure at the cable exit end is a small segment fixing method. For example, the length to be fixed is only 3mm, that is, the depth of the radial mating groove is 3mm. In this case, such a short bonding section requires a sufficiently large bonding area. Therefore, the mating groove method in the above embodiments is not recommended. Although it is convenient for assembly and for applying adhesive from the top groove opening, only half of the fixing area is used (that is, only the bottom semi-circular section is used, while the vertical section from the side of the groove to the top cannot be used for mating and fixing). It should also be understood that since the tail end fixing structure does not need to arrange a large number of optical functional components, a sufficiently long inner sleeve and fixing section of the tail end fixing structure can be arranged. Therefore, with such a sufficient bonding area, the semi-open fixing structure mode in the embodiments of this disclosure can be adopted. It should also be understood that the so-called semi-open fixing structure is defined as a structure in which the inner sleeve remains in an open state after assembly and fixing. It is not a closed mode after complete assembly and fixing, hence the name semi-open fixing structure. In other words, the so-called "semi-open" means that, compared with the fully enclosed annular groove, the mating groove can only cover part of the outer wall of the inner sleeve, while its top can have an opening.

[0044] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

[0045] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A semi-open fixing structure for an optical fiber displacement sensor, the optical fiber displacement sensor including a relative motion component, the relative motion component including an inner sleeve and an outer sleeve; the outer sleeve is configured to be fitted over the outer side of the inner sleeve; the inner wall of the outer sleeve and the outer wall of the inner sleeve abut against each other to form a relatively sliding structure, and the central axis of the inner sleeve coincides with the central axis of the outer sleeve; Its features are, The fixing structure includes a fixing structure body, which has a radial mating surface for fixed connection with the inner sleeve and an mounting end face for contacting the surface of the object being measured; a mating groove is provided on the radial mating surface, which is configured to be bonded and fixed to the outer wall of the inner sleeve by an adhesive, and the central axis of the mating groove coincides with the central axis of the inner sleeve. A dispensing groove is provided on the arc-shaped groove wall of the mating groove. The dispensing groove extends circumferentially along the arc-shaped groove wall of the mating groove. The dispensing groove is configured to collect the adhesive that overflows from between the outer wall of the inner sleeve and the arc-shaped groove wall of the mating groove during the bonding process.

2. The fixing structure according to claim 1, characterized in that, The fixing structure body also has an adhesive application surface, which is configured to face opposite to the mounting end face, and the adhesive application surface is also provided with a top opening that communicates with the mating groove.

3. The fixing structure according to claim 1, characterized in that, A portion of the opening of the mating groove is located on the radial mating surface, and another portion of the opening of the mating groove is located on the dispensing surface.

4. The fixing structure according to claim 1, characterized in that, The dispensing grooves are multiple, and are distributed at intervals along the radial direction of the mating groove on the arc-shaped groove wall of the mating groove.

5. The fixing structure according to claim 1, characterized in that, The cross-sectional shape of the dispensing groove can be any one of U-shape, semi-circle, V-shape or rectangle.

6. The fixing structure according to claim 1, characterized in that, The depth of the dispensing groove is 0.2mm to 0.8mm, and the width of the groove opening is 0.3mm to 1.0mm.

7. The fixing structure according to claim 1, characterized in that, The arc shape of the groove wall is adapted to the outer diameter of the inner sleeve, so that the outer wall of the inner sleeve and the arc groove wall form a close fit.

8. The fixing structure according to claim 1, characterized in that, The fixed structure body is made of metal or engineering plastic; the metal material includes any one of stainless steel and aluminum alloy, and the engineering plastic includes any one of PEEK and polycarbonate.

9. A fiber optic displacement sensor, characterized in that, Includes the fixed structure as described in any one of claims 1 to 8.

Images