Novel fiber bragg grating sensor shell and novel fiber bragg grating sensor

Abstract

The utility model discloses a novel fiber bragg grating sensor housing and a novel fiber bragg grating sensor, and the novel fiber bragg grating sensor housing comprises a first main body, a first channel, a temperature grating chamber, a first fastening structure, a second main body, a second channel, a strain grating chamber, and a second fastening structure. According to the novel fiber grating sensor shell disclosed by the utility model, temperature and stress detection is realized on the same sensor, the temperature detection grating is utilized to carry out temperature compensation on the strain detection grating, the stability of stress detection is ensured, the temperature drift is reduced, the purpose of separately measuring the temperature and the stress is achieved, the problem of cross sensitivity is solved, and the measurement accuracy is improved. And the structure is small and compact.

Description

Technical Field

[0001] The utility model relates to the technical field of fiber grating sensors, in particular to a novel fiber grating sensor housing and a novel fiber grating sensor. Background Art

[0002] The fiber grating sensor (Fiber Grating Sensor) belongs to a kind of fiber optic sensor. The sensing process based on the fiber grating obtains sensing information through the modulation of the fiber Bragg wavelength by external physical parameters, and it is a wavelength modulation type fiber optic sensor. The fiber grating sensor can directly measure physical quantities such as temperature and strain. The existing fiber grating sensors capable of temperature and strain detection are shown in the one-dimensional fiber grating vibration sensor with self-temperature and prestress compensation disclosed in the Chinese patent with the publication number CN114509151B. It realizes the functions of temperature detection and stress detection simultaneously, but both its temperature detection grating and stress detection grating are inscribed on the same optical fiber. Since the fiber grating wavelength is sensitive to both temperature and strain at the same time, that is, temperature and strain simultaneously cause the shift of the fiber grating coupling wavelength, it is impossible to distinguish temperature and strain by measuring the shift of the fiber grating coupling wavelength. Therefore, realizing the differential measurement of temperature and stress and solving the cross-sensitivity problem have become difficult problems that need to be urgently solved by those skilled in the art. Summary of the Utility Model

[0003] To solve the above technical problems, the utility model provides a novel fiber grating sensor housing and a novel fiber grating sensor. Among them, the novel fiber grating sensor housing includes:

[0004] A first main body, the first main body is provided with a through first channel, and a temperature grating chamber is arranged in the first channel;

[0005] A second main body, the second main body is provided with a through second channel, and a strain grating chamber is arranged in the first channel and / or the second channel, and the optical fiber can pass through the first channel and the second channel;

[0006] A sleeve, the sleeve is arranged on the outer walls of at least part of the first main body and at least part of the second main body;

[0007] A first fastening structure is arranged between the temperature grating chamber and the strain grating chamber of the first main body, and the second main body is provided with a second fastening structure. The first fastening structure and the second fastening structure are used to fix both ends of the strain detection grating, and the second main body can move relative to the first main body.

[0008] Preferably, at least two first fastening structures are arranged at intervals along the length direction of the first main body.

[0009] Preferably, a third fastening structure is provided on a side of the first body away from the strain grating chamber.

[0010] Preferably, the first body is provided with a relaxation adjustment structure for relaxing the temperature detection grating.

[0011] Preferably, the first fastening structure, the second fastening structure, the third fastening structure, and the relaxation adjustment structure are of a structure of threaded holes and bolts.

[0012] Preferably, an elastic support member is provided between the first body and the second body;

[0013] One end of the first body close to the second body is provided with a first boss, and the first channel penetrates through the first boss;

[0014] The second body is provided with a second boss, and the second channel penetrates through the second boss;

[0015] Both ends of the elastic support member are respectively connected to the first boss and the second boss.

[0016] Preferably, sealing rings are radially provided on the outer walls of the first body and the second body; the sealing rings are in contact with the inside of the sleeve.

[0017] Preferably, the first body is provided with a first threaded end; the second body is provided with a second threaded end.

[0018] Preferably, the cross-sections of the bottoms of the first channel and the second channel are V-shaped.

[0019] Another novel fiber grating sensor provided by the present utility model adopts the novel fiber grating sensor housing as described above arbitrarily.

[0020] The novel fiber grating sensor housing provided by the present utility model, through the structure combined by the first body, the first channel, the temperature grating chamber, the first fastening structure, the second body, the second channel, the strain grating chamber, and the second fastening structure, realizes temperature and stress detection on the same sensor, uses the temperature detection grating to perform temperature compensation on the strain detection grating, ensures the stability of stress detection, reduces the temperature drift, achieves the purpose of temperature and stress differential measurement, solves the cross-sensitivity problem, and moreover, has a small and compact structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the novel fiber grating sensor housing provided by an embodiment of the present utility model;

[0022] Figure 2 It is an exploded view of the novel fiber grating sensor housing;

[0023] Figure 3 It isFigure 1 Cross-sectional view along A-A in [the figure];

[0024] Figure 4 is Figure 2 Cross-sectional view along B-B in [the figure];

[0025] Wherein: 10, the first main body; 11, the first channel; 12, the temperature grating chamber; 13, the first fastening structure; 14, the slack adjustment structure; 15, the first groove; 16, the first boss; 17, the first threaded end; 18, the third fastening structure; 20, the second main body; 21, the second channel; 22, the strain grating chamber; 23, the second fastening structure; 25, the second groove; 26, the second boss; 27, the second threaded end; 30, the sleeve; 40, the elastic support. Specific embodiments

[0026] In order to make the technical means, creative features, achieved purposes and functions of the present utility model easy to understand, the present utility model will be further described below in conjunction with specific embodiments. However, the following embodiments are only the preferred embodiments of the present utility model and not all of them. Based on the embodiments in the implementation manners, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present utility model. The experimental methods in the following embodiments are all conventional methods unless otherwise specified. The materials, reagents, etc. used in the following embodiments can all be obtained from commercial channels unless otherwise specified.

[0027] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0028] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc., should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0029] The embodiments of the present utility model provide a novel fiber grating sensor housing and a novel fiber grating sensor, asFigure 1 , Figure 2 and Figure 3 As shown in ,

[0030] , and , the housing of the novel fiber Bragg grating sensor includes a first main body 10, a second main body 20, and a sleeve 30, where:

[0030] The first main body 10 is a tubular structure, and a through first channel 11 is formed on its inner wall. A temperature grating chamber 12 is provided in the first channel 11, and the temperature grating chamber 12 is used to accommodate a temperature detection grating.

[0031] The second main body 20 is a tubular structure, and a through second channel 21 is formed on its inner wall. The channel opening of the first channel 11 is arranged opposite to the channel opening of the second channel 21. A strain grating chamber 22 is provided in the first channel 11 and / or the second channel 21, and the strain grating chamber 22 is used to accommodate a stress detection grating. An optical fiber can pass through the first channel 11 and the second channel 21.

[0032] The sleeve 30 is a tubular structure. The sleeve 30 is sleeved on the outer walls of a part of the first main body 10 and a part of the second main body 20, covering the position between the first main body 10 and the second main body 20 and providing alignment support for the channel openings of the first main body 10 and the second main body 20.

[0033] A first fastening structure 13 is provided between the temperature grating chamber 12 and the strain grating chamber 22 of the first main body 10. The second main body 20 is provided with a second fastening structure 23. The first fastening structure 13 and the second fastening structure 23 are used to fix both ends of the strain detection grating. The second main body 20 can move relative to the first main body 10. The fastening structure includes but is not limited to a bolt structure, a clamping structure, etc.

[0034] When assembling the optical fiber, the optical fiber passes through the first channel 11 of the first main body 10 and then through the second channel 21 of the second main body 20. A temperature detection grating is inscribed at the position of the temperature grating chamber 12 of the optical fiber, and a stress detection grating is inscribed at the position of the strain grating chamber 22 of the optical fiber. The optical fiber is fixed in the first main body 10 through the first fastening structure 13 and fixed in the second main body 20 through the second fastening structure 23.

[0035] During detection, one end of the first body 10 far from the second body 20 and one end of the second body 20 far from the first body 10 are respectively fixed on the test workpiece. When the test workpiece deforms, the second body 20 will change slightly relative to the first body 10, and the strain detection grating will be tightened. The grating will detect the magnitude of this tightening force, so as to detect the deformation condition of the test workpiece. At the same time, when the temperature changes, the temperature detection grating is used to perform temperature compensation on the strain detection grating (that is, the data measured by the temperature detection grating is used to compensate for the change in the strain value of the strain detection grating caused by temperature change). Thus, temperature and stress detection are realized on the same sensor. By tightening the optical fiber through the first fastening structure 13 to isolate the temperature grating chamber 12 and the strain grating chamber 22, through the combination of the first fastening structure 13 with the second fastening structure 23, the first body 10, the second body 20 and the sleeve 30, stress detection is realized, the purpose of distinguishing temperature and stress measurement is achieved, and the cross-sensitivity problem is solved. Moreover, the structure is small and compact. In this embodiment, the principles of detection and temperature compensation of the temperature detection grating and the strain detection grating belong to the prior art in this field and will not be elaborated here.

[0036] The novel optical fiber grating sensor housing provided by the embodiment of the present invention realizes temperature and stress detection on the same sensor through the structure combined by the first body 10, the first channel 11, the temperature grating chamber 12, the first fastening structure 13, the second body 20, the second channel 21, the strain grating chamber 22 and the second fastening structure 23, achieves the purpose of distinguishing temperature and stress measurement, solves the cross-sensitivity problem, and moreover, the structure is small and compact.

[0037] Furthermore, at least two first fastening structures 13 are arranged at intervals along the length direction of the first body 10.

[0038] During specific implementation, as Figure 2 、 Figure 3 shown, two or more first fastening structures 13 are arranged at intervals along the length direction of the first body 10. During use, by selecting the first fastening structures 13 at different positions to fasten the optical fiber, the distance between the first fastening structure 13 and the second fastening structure 23 can be adjusted. By adjusting the distance between the first fastening structure 13 and the second fastening structure 23, the sensitivity of the strain detection grating can be adjusted. The shorter the distance, the higher the sensitivity, so that it is convenient for the user to adjust the sensitivity of the grating according to the use needs during use.

[0039] Furthermore, a third fastening structure 18 is arranged on the side of the first body 10 far from the strain grating chamber 22.

[0040] During specific implementation, as Figure 3As shown, on one side of the first body 10 away from the strain grating chamber 22, a third fastening structure 18 is provided. The third fastening structure 18 and the first fastening structure 13 are respectively used to fix the optical fibers on both sides of the temperature grating chamber 12, ensuring the relaxation of the temperature grating and improving the accuracy of temperature measurement by the temperature grating.

[0041] Further, the first body 10 is provided with a relaxation adjustment structure 14, and the relaxation adjustment structure 14 is used to relax the temperature detection grating.

[0042] During specific implementation, the first body 10 is provided with a relaxation adjustment structure 14, and the relaxation adjustment structure 14 is used for grating relaxation adjustment. The relaxation adjustment structure 14 has a structure of a threaded hole combined with a bolt. When it is necessary to relax the temperature detection grating, a bolt is screwed into the threaded hole at this position to adjust the relaxation degree of the grating, and then the bolt is screwed out after completion to complete the relaxation degree adjustment.

[0043] Further, the first fastening structure 13, the second fastening structure 23, the third fastening structure 18, and the relaxation adjustment structure 14 are structures of threaded holes and bolts.

[0044] During specific implementation, as Figure 3 shown, the first body 10 is provided with a plurality of first threaded holes along the length direction, and the first threaded holes lead to the first channel 11. Screwing bolts into the plurality of first threaded holes forms the first fastening structure 13, the second fastening structure 23, and the third fastening structure 18;

[0045] The second body 20 is provided with second threaded holes, and the second threaded holes lead to the second channel 21. Screwing bolts into the second threaded holes forms the second fastening structure 23; through the structure of threaded holes and bolts, on the one hand, both the adjustment and fixation operations are simple, and the use is more convenient and fast; on the other hand, when the first body 10 and the second body 20 are tubular structures with a small diameter, the structure of the threaded holes is more convenient for processing.

[0046] Further, an elastic support member 40 is provided between the first body 10 and the second body 20;

[0047] One end of the first body 10 close to the second body 20 is provided with a first boss 16, and the first channel 11 penetrates through the first boss 16;

[0048] The second body 20 is provided with a second boss 26, and the second channel 21 penetrates through the second boss 26;

[0049] Both ends of the elastic support member 40 are respectively connected to the first boss 16 and the second boss 26.

[0050] During specific implementation, as Figure 2 、 Figure 3As shown, an elastic support member 40 is provided between the first main body 10 and the second main body 20. The elastic support member 40 includes, but is not limited to, springs, elastic rubber rings, etc.;

[0051] One end of the first main body 10 close to the second main body 20 is provided with a first boss 16, and the first channel 11 penetrates through the first boss 16;

[0052] The second main body 20 is provided with a second boss 26, and the second channel 21 penetrates through the second boss 26;

[0053] The hollow parts at both ends of the elastic support member 40 are respectively clamped on the first boss 16 and the second boss 26. Through the combination of the elastic support member 40 and the first boss 16 and the second boss 26, the connection and support between the first main body 10 and the second main body 20 are achieved, and the stress detection accuracy is improved.

[0054] Furthermore, sealing rings are radially provided on the outer walls of the first main body 10 and the second main body 20; the sealing rings are in contact with the inside of the sleeve 30.

[0055] During specific implementation, as Figure 2 shown, a first groove 15 is radially provided on the outer wall of the first main body 10, a second groove 25 is radially provided on the outer wall of the second main body 20, sealing rings (not marked in the figure) are provided in the first groove 15 and the second groove 25, and the sleeve 30 is sleeved outside the sealing rings. The sealing rings can effectively prevent impurities such as moisture and dust from entering the sensor, enabling the sensor to operate stably in a harsh environment.

[0056] Furthermore, the first main body 10 is provided with a first threaded end 17; the second main body 20 is provided with a second threaded end 27.

[0057] During specific implementation, as Figure 2 shown, one end of the first main body 10 away from the first main body 10 is provided with a first threaded end 17; one end of the second main body 20 away from the first main body 10 is provided with a second threaded end 27. The first threaded end 17 and the second threaded end 27 are used to connect with the workpiece to be measured. Through the threaded connection structure, the sensor can be quickly connected to the workpiece to be measured.

[0058] Furthermore, at least the cross-sections of the bottoms of the temperature grating chamber 12 and the strain grating chamber 22 are V-shaped.

[0059] During specific implementation, as Figure 4 shown, the cross-sections of the bottoms of the first channel 11 and the second channel 21 are V-shaped. Through the structure of the V-shaped fixing groove, when the screws in the threaded holes of the first fastening structure, the second fastening structure, and the third fastening structure are screwed in, the effect of clamping and fixing the optical fiber can be improved, playing a role in strengthening and fixing.

[0060] The present utility model further provides a novel fiber Bragg grating sensor, which adopts the novel fiber Bragg grating sensor housing described above arbitrarily.

[0061] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A novel fiber Bragg grating sensor housing, characterized in that, Comprising: A first body (10), the first body (10) is provided with a through first channel (11), and a temperature grating chamber (12) is arranged in the first channel (11); A second body (20), the second body (20) is provided with a through second channel (21), a strain grating chamber (22) is arranged in the first channel (11) and / or the second channel (21), and an optical fiber can pass through the first channel (11) and the second channel (21); A sleeve (30), the sleeve (30) is arranged on the outer walls of at least part of the first body (10) and at least part of the second body (20); A first fastening structure (13) is arranged between the temperature grating chamber (12) and the strain grating chamber (22) of the first body (10), the second body (20) is provided with a second fastening structure (23), the first fastening structure (13) and the second fastening structure (23) are used to fix both ends of the strain detection grating, and the second body (20) can move relative to the first body (10).

2. The novel fiber Bragg grating sensor housing according to claim 1, wherein: At least two first fastening structures (13) are arranged at intervals along the length direction of the first body (10).

3. The novel fiber Bragg grating sensor housing according to claim 1, wherein: A third fastening structure (18) is arranged on one side of the first body (10) away from the strain grating chamber (22).

4. The novel fiber grating sensor housing according to claim 3, characterized in that: The first body (10) is provided with a relaxation adjustment structure (14), and the relaxation adjustment structure (14) is used to relax the temperature detection grating.

5. The novel fiber grating sensor housing according to any one of claims 1-4, characterized in that: The first fastening structure (13), the second fastening structure (23), the third fastening structure (18) and the relaxation adjustment structure (14) are structures of threaded holes and bolts.

6. The novel fiber grating sensor housing according to claim 1, wherein: An elastic support member (40) is arranged between the first body (10) and the second body (20); One end of the first body (10) close to the second body (20) is provided with a first boss (16), and the first channel (11) penetrates through the first boss (16); The second body (20) is provided with a second boss (26), and the second channel (21) penetrates through the second boss (26); Both ends of the elastic support member (40) are respectively connected to the first boss (16) and the second boss (26).

7. The novel fiber Bragg grating sensor housing according to claim 1, characterized in that: Sealing rings are radially arranged on the outer walls of the first body (10) and the second body (20); the sealing rings are in contact with the inside of the sleeve (30).

8. The novel fiber Bragg grating sensor housing according to claim 1, characterized in that: The first body (10) is provided with a first threaded end (17); the second body (20) is provided with a second threaded end (27).

9. The novel fiber Bragg grating sensor housing according to claim 1, characterized in that: The cross-sections of the bottoms of the first channel (11) and the second channel (21) are V-shaped.

10. A novel fiber Bragg grating sensor, characterized in that: Adopt the novel optical fiber grating sensor housing according to any one of claims 1-9.

Images