阅读说明：本技术 一种光纤光栅单向应变传感器 (One-way strain sensor of fiber grating ) 是由 刘化利 杨帆 孙超 于 2018-07-10 设计创作，主要内容包括：本发明公开了一种光纤光栅单向应变传感器,本发明实施例提供的光纤光栅单向应变传感器,包括了具有温度补偿的温度补偿传感模块及具有对光纤光栅进行减敏功能的应变传感器模块,其中的应变传感器模块中的三环减敏基片固定光纤光栅区域采用了三环平行结构,这样,在采用本发明实施例提供的光纤光栅单向应变传感器进行应力监测时,就实现了对光纤光栅的减敏设计及温度补偿设计,结构简单,提高了监测灵敏度及提高量程。(The invention discloses a fiber grating one-way strain sensor, which comprises a temperature compensation sensing module with temperature compensation and a strain sensor module with a desensitization function on a fiber grating, wherein a three-ring desensitization substrate fixing fiber grating area in the strain sensor module adopts a three-ring parallel structure, so that when the fiber grating one-way strain sensor provided by the embodiment of the invention is used for stress monitoring, the desensitization design and the temperature compensation design of the fiber grating are realized, the structure is simple, the monitoring sensitivity is improved, and the measuring range is improved.)

1. The utility model provides a be applied to stress monitoring's one-way strain transducer of fiber grating which characterized in that includes: the strain sensor comprises a strain sensor module (1), a temperature compensation sensing module (2), a sensor bottom plate (3), a sensor protective shell (4) and an optical fiber cable (5), wherein the strain sensor module (1) is welded in the middle of the sensor bottom plate (3), the temperature compensation sensing module (2) is arranged at the upper part of the strain sensor module, the sensor protective shell (4) completely covers the temperature compensation sensing module (2), the strain sensor module (1) and the sensor bottom plate (3), wherein,

the optical fiber cable (5) comprises a grating in the middle, optical fiber loose tubes at two ends of the grating and armor tubes at two edge ends;

the strain sensor module (1) comprises a three-ring desensitization substrate (101) and sensor welding blocks (102) which are respectively connected with two ends of the three-ring desensitization substrate (101), the grating is packaged on a first groove of the three-ring desensitization substrate (101), three annular structures are uniformly distributed in parallel in the direction of the first groove of the three-ring desensitization substrate (101), the armor pipes are fixed on the sensor welding blocks (102), and the sensor welding blocks (102) are welded on the surface of a structure to be measured;

the temperature compensation sensing module (2) comprises a temperature compensation substrate (201) and a temperature compensation substrate (202) connected with one end of the temperature compensation substrate (201), the temperature compensation substrate (202) is fixed on the sensor welding block (102), a second groove is arranged in the temperature compensation substrate (201) and used for placing the bare grating, third grooves are respectively arranged in the extending directions of two ends of the second groove of the temperature compensation substrate (201) and used for placing the optical fiber loose tube, and the armor tube is arranged on the temperature compensation substrate (202) along a fourth groove in the extending direction of the third grooves.

2. The sensor of claim 1, wherein the three-ring desensitizing substrate (101) is integrally formed from a first end piece (1011), a second end piece (1012), a first ring-shaped body (1013), a second ring-shaped body (1014), a third ring-shaped body (1015), a first connecting piece (1016), and a second connecting piece (1017), wherein,

the first ring body (1013) is close to the first end piece (101), the second ring body (1014) is close to the second end piece (1012), the third ring body (1015) is arranged between the first ring body (1013) and the second ring body (1014), the first ring body (1013) is connected through the first connecting piece (1016) and the second ring body (1014) is connected through the second connecting piece (1017), and the axial directions of the first ring body (1013), the second ring body (1014) and the third ring body (1015) are vertical to the planes of the first connecting piece (1016) and the second connecting piece (1017). The first connecting sheet (1016) and the second connecting sheet (1017) are provided with first grooves for placing the bare fiber grating, the first grooves are provided with two round holes symmetrical to the third ring body (1015), and a grid region in the bare fiber grating is fixed between the two round holes; threaded holes are symmetrically formed in the first end piece (1011) and the second end piece (1012) in the first groove to be overlapped with the threaded holes formed in the sensor welding block (102), and the three-ring desensitization substrate (101) is fixed on the sensor welding block (102) through screws.

3. The sensor according to claim 1, wherein the sensor pad (102) is provided with a first threaded hole coinciding with the threaded hole of the three-ring desensitization substrate (101), and the three-ring desensitization substrate (101) is fixed to the sensor pad (102) by screws;

the sensor welding block (102) is also provided with a second threaded hole for fixing the temperature compensation sensing module (2) and a third threaded hole for fixing the fixing block of the optical fiber cable (5); the first groove of the three-ring desensitization substrate (101) extends from the sensor welding block (102) and sequentially extends to the first sub-groove and the second sub-groove, wherein the exposed optical fiber is placed in the extending part of the first groove, the optical fiber loose tube is placed in the first sub-groove, and the armor tube is placed in the second sub-groove.

4. A sensor according to claim 3, wherein the strain sensor module (1) further comprises a fixing block (103) for the optical fiber cable (5), having a groove for placing the sheathing tube and threaded holes symmetrically arranged on both sides of the groove, wherein the threaded holes coincide with the third threaded holes on the sensor pads (102) to screw the sensor pads (102) and the fixing block (103) for the optical fiber cable (5).

5. The sensor according to claim 3 or 4, characterized in that the second groove in the temperature compensation substrate (201) is symmetrically arranged on both sides of the first threaded hole of the temperature compensation substrate (201) and the second threaded hole of the temperature compensation substrate (202), the two threaded holes are overlapped, and the temperature compensation substrate (201) and the temperature compensation substrate (202) are fixed by screws;

and a third threaded hole is formed in the outer side of the second threaded hole of the temperature compensation substrate (202) and is overlapped with the second threaded hole of the sensor welding block (102), and the temperature compensation substrate (202) and the sensor welding block (102) are fixed by screws.

6. The sensor of claim 1, wherein the temperature compensation substrate (201) is the same material as the three-ring desensitizing substrate (101).

7. The sensor according to claim 1, wherein the sensor base plate (3) is composed of a sensor base plate welding frame (33) and a cable fixing block (31), the sensor base plate welding frame (33) is welded on the periphery of the strain sensor module (1), a groove is arranged at the position of the armor tube of the optical fiber cable (5) to be accessed, and a convex groove is arranged at the cable fixing block (31), and the groove and the convex groove are formed into a whole to fix the armor tube;

threaded holes symmetrically arranged on two sides of the convex groove of the optical cable fixing block (31) are overlapped with threaded holes symmetrically arranged in the groove of the sensor base plate welding frame (33), and the sensor base plate welding frame (33) and the optical cable fixing block (31) are fixed through the overlapped threaded holes by screws; and a plurality of threaded holes for fixing the sensor protection shell (4) by screws are further arranged on the sensor bottom plate welding frame (33).

8. A sensor according to claim 1, characterized in that the protective casing (4) has threaded holes for fixing with screws the sensor base plate (3) and has grooves in the position of the sheathing tube of the optical fiber cable (5) for access.

Technical Field

The invention relates to the stress monitoring technology of objects, in particular to a fiber bragg grating one-way strain sensor for stress monitoring.

Background

A Fiber Bragg Grating (FBG) sensor belongs to one type of optical fiber sensors, and the sensing process based on the FBG obtains sensing information by modulating the wavelength of fiber Bragg through external physical parameters, and is a wavelength modulation type optical fiber sensor. The fiber grating sensor can be attached to a structure to be measured, and direct measurement of physical quantities such as temperature, strain and the like of the structure to be measured is achieved. The fiber grating sensor can be classified into a fiber grating temperature sensor and a fiber grating strain sensor according to types. The fiber grating sensor is one of the most rapidly developed and widely applied fiber passive devices in recent years, has the advantages of simple structure, good reliability, corrosion resistance, strong anti-electromagnetic interference capability, strong multiplexing capability and the like compared with the traditional electric signal sensor, can form a sensing network with various connection modes, and realizes large-area measurement and multi-point measurement of a structure to be measured. Fiber grating sensors themselves offer many irreplaceable advantages and are therefore favored by more and more researchers and engineers.

The stress monitoring technology of the structure to be tested is generally applied to the fields of relatively complex structure, relatively large strain range and relatively high requirement on the stability of the structural system to be tested, so that the problems of enlarging the measuring range, increasing the stability of the structural system to be tested and simplifying the packaging process are the first problems to be solved in the research of the fiber grating strain sensor. However, the strain range of the fiber grating used in the fiber grating strain sensor for long-term operation is ± 2000 μ ∈, which is far lower than the strain range required by the structure to be measured, so that the fiber grating strain sensor needs to be desensitized to meet the requirement. At present, there are two design schemes for fiber grating strain sensors: one is a fiber grating strain sensor with a substrate structure, the sensitivity coefficient of the fiber grating strain sensor is 1.05 pm/mu epsilon, the linearity is about 0.99, and the sensitivity and the linearity can not meet the requirements of a structure to be measured; the other is a fiber Bragg grating strain sensor with a spiral inclined composite structure, which skillfully desensitizes the strain of the optical fiber in the strain sensor in the structure, but the structure is complex and is not easy to realize.

When the two fiber bragg grating strain sensors are applied to wide-range measurement of a structure to be measured, one is that the linearity and the sensitivity precision are to be improved, the other is that the structure is complex, the implementation is not easy, and the cost is high. Therefore, at present, no fiber grating strain sensor which has a simple structure and can improve the measuring range and the monitoring sensitivity exists.

Disclosure of Invention

One embodiment of the invention provides a fiber grating unidirectional strain sensor for stress monitoring, which is simple in structure and capable of improving monitoring sensitivity and improving measuring range.

The embodiment of the invention is realized as follows:

a fiber grating unidirectional strain sensor applied to stress monitoring comprises: the strain sensor comprises a strain sensor module, a temperature compensation sensing module, a sensor bottom plate, a sensor protective shell and an optical fiber cable, wherein the strain sensor module is welded in the middle of the sensor bottom plate, the temperature compensation sensing module is arranged at the upper part of the strain sensor module, the sensor protective shell completely covers the temperature compensation sensing module, the strain sensor module and the sensor bottom plate, wherein,

the optical fiber cable comprises a grating in the middle, optical fiber loose tubes at two ends of the grating and armor tubes at two edge ends;

the strain sensor module comprises a three-ring desensitization substrate and sensor welding blocks respectively connected with two ends of the three-ring desensitization substrate, the grating is packaged on a first groove of the three-ring desensitization substrate, three annular structures are uniformly distributed in parallel in the direction of the first groove of the three-ring desensitization substrate, the armor tube is fixed on the sensor welding blocks, and the sensor welding blocks are welded on the surface of a structure to be measured;

the temperature compensation sensing module comprises a temperature compensation substrate and a temperature compensation substrate connected with one end of the temperature compensation substrate, the temperature compensation substrate is fixed on the sensor welding block, a second groove is formed in the temperature compensation substrate and used for placing the exposed grating, third grooves are formed in the extending directions of two ends of the second groove of the temperature compensation substrate and used for placing the optical fiber loose tube, and a fourth groove formed in the extending direction of the third groove on the temperature compensation substrate and used for placing the armored tube.

As can be seen from the above, the fiber grating unidirectional strain sensor provided in the embodiment of the present invention includes a temperature compensation sensing module with temperature compensation and a strain sensor module with a function of desensitizing a fiber grating, wherein a three-ring desensitization substrate fixing fiber grating region in the strain sensor module adopts a three-ring parallel structure, so that when the fiber grating unidirectional strain sensor provided in the embodiment of the present invention is used for stress monitoring, a desensitization design and a temperature compensation design of the fiber grating are implemented, the structure is simple, the monitoring sensitivity is improved, and the measurement range is increased.

Drawings

Fig. 1 is a schematic general structural diagram of a fiber grating unidirectional strain sensor for stress monitoring according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a strain sensor module according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a three-ring desensitization substrate in a strain sensor module according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a solder bump structure in a strain sensor module according to an embodiment of the invention;

fig. 5 is a schematic structural diagram of a cable fixing block in a strain sensor module according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a temperature compensation sensing module according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a sensor substrate structure according to an embodiment of the present invention;

fig. 8 is a schematic structural view of a sensor protection shell according to an embodiment of the present invention.

Reference numerals

1-Strain sensor Module

101-three ring desensitization substrate

1011-first end piece

1012-second end piece

1013-first ring body

1014-second Ring

1015-third Ring

1016-first connecting piece

1017-second connecting sheet

102-sensor solder bump

103-optical fiber cable 5 fixing block

2-temperature compensation sensing module

201-temperature compensation substrate

202-temperature compensation substrate

3-sensor base plate

33-sensor bottom plate welding frame

31-optical cable fixing block

4-sensor protective housing

5-optical fiber cable

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and examples.

The embodiment of the invention aims to realize the desensitization design and the temperature compensation design of the fiber bragg grating when the fiber bragg grating unidirectional strain sensor carries out stress monitoring, and the fiber bragg grating unidirectional strain sensor comprises a temperature compensation sensing module with temperature compensation and a strain sensor module with the desensitization function of the fiber bragg grating, wherein a three-ring desensitization substrate fixed fiber bragg grating area in the strain sensor module adopts a three-ring parallel structure. Therefore, the fiber bragg grating unidirectional strain sensor provided by the embodiment of the invention has a simple structure, and the monitoring sensitivity and the measuring range are improved.

Further, when the fiber bragg grating unidirectional strain sensor provided by the embodiment of the invention is used for monitoring the stress of the structure to be measured by using the physical parameter measurement result of the fiber bragg grating, the unidirectional stress of the structure to be measured is measured, so that the fiber bragg grating unidirectional strain sensor is called as the fiber bragg grating unidirectional strain sensor.

Fig. 1 is a schematic general structural diagram of a fiber grating unidirectional strain sensor for stress monitoring according to an embodiment of the present invention, including: the strain sensor comprises a strain sensor module 1, a temperature compensation sensing module 2, a sensor bottom plate 3, a sensor protective shell 4 and an optical fiber cable 5, wherein the strain sensor module 1 is welded in the middle of the sensor bottom plate 3, the temperature compensation sensing module 2 is arranged on the upper part of the strain sensor module 1, the sensor protective shell 4 completely covers the temperature compensation sensing module 2, the strain sensor module 1 and the sensor bottom plate 3, wherein,

the optical fiber cable 5 comprises a bare optical fiber in the middle, optical fiber loose tubes at two ends of the bare optical fiber and armor tubes at two edge ends;

the strain sensor module 1 comprises a three-ring desensitization substrate 101 and sensor welding blocks 102 respectively connected with two ends of the three-ring desensitization substrate 101, the bare optical fibers are packaged on a first groove of the three-ring desensitization substrate 101, three annular structures are uniformly distributed in parallel in the direction of the first groove of the three-ring desensitization substrate 101, the armor tubes are fixed on the sensor welding blocks 102, and the sensor welding blocks 102 are welded on the surface of a structure to be measured;

the temperature compensation sensing module 2 comprises a temperature compensation substrate 201 and a temperature compensation substrate 202 connected with one end of the temperature compensation substrate 201, the temperature compensation substrate 202 is fixed on the sensor welding block 102, a second groove is formed in the temperature compensation substrate 201 and used for placing the bare optical fiber, third grooves are formed in the extending directions of two ends of the second groove of the temperature compensation substrate 201 and used for placing the optical fiber loose tube, and a fourth groove formed in the temperature compensation substrate 202 along the extending direction of the third grooves is used for placing the armored tube.

In the structure, the optical fiber cable 5 consists of a bare optical fiber, an optical fiber loose tube and an armored tube from inside to outside, the optical fiber cable 5 is fixed by the strain sensor module 1 and the temperature compensation sensing module 2, and an optical fiber grating area is arranged in the middle of the bare optical fiber. When monitoring a structure to be measured, the fiber bragg grating is arranged on the fiber bragg grating one-way strain sensor, the fiber bragg grating one-way strain sensor is welded on the surface of the structure to be measured, the structure to be measured is deformed to drive the fiber bragg grating on the fiber bragg grating one-way strain sensor to be deformed, the central wavelength variation of the fiber bragg grating is obtained through measurement, and the strain of the structure to be measured is determined according to the variation of the central wavelength.

Fig. 2 is a schematic structural diagram of a strain sensor module according to an embodiment of the present invention, where the strain sensor module 1 includes a three-ring desensitization substrate 101, a sensor pad 102 connected to two ends of the three-ring desensitization substrate 101, and a fixing block 103 for fixing an optical fiber cable 5. The strain sensor module is described in detail with reference to the schematic structural diagram of the three-ring desensitization substrate 101 shown in fig. 3, the schematic structural diagram of the sensor solder block 102 shown in fig. 4, and the schematic structural diagram of the fixing block 103 of the optical fiber cable 5 shown in fig. 5.

As shown in fig. 3, the three-ring desensitizing substrate 101 is integrally formed by a first end piece 1011, a second end piece 1012, a first ring-shaped body 1013, a second ring-shaped body 1014, a third ring-shaped body 1015, a first connecting piece 1016 and a second connecting piece 1017, wherein the first ring-shaped body 1013 is close to the first end piece 101, the second ring-shaped body 1014 is close to the second end piece 1012, the third ring-shaped body 1015 is arranged between the first ring-shaped body 1013 and the second ring-shaped body 1014, is respectively connected with the first ring-shaped body 1013 through the first connecting piece 1016, is connected with the second ring-shaped body 1014 through the second connecting piece 1017, and the axial directions of the first ring-shaped body 1013, the second ring-shaped body 1014 and the third ring-shaped body 1015 are perpendicular to the planes of the first connecting piece 1016 and the second connecting piece. The first connecting sheet 1016 and the second connecting sheet 1017 are provided with first grooves for placing the bare fiber grating, the first grooves are provided with two circular holes symmetrical to the third ring-shaped body 1015, and the grid region in the bare fiber grating is fixed between the two circular holes; threaded holes are formed in the first end piece 1011 and the second end piece 1012 symmetrically with respect to the first groove 6 to coincide with the threaded holes formed in the sensor pad 102, and the three-ring desensitization substrate 101 is fixed to the sensor pad 102 by screws.

In this structure, two round holes can prevent during glue infiltration bars district, and first ring 1013, second ring 1014, third ring 1015 can play the desensitization effect, and when the structure of awaiting measuring takes place deformation, three ring can bear most deformation, and the bars district between two round holes only receives less deformation to the range has been increased. The strain range of the fiber grating in long-term operation is +/-2000 mu epsilon, the desensitization ratio provided by the three ring bodies of the sensor provided by the embodiment of the invention is 2.9 by finite element analysis and theoretical calculation, the accuracy of the sensor provided by the embodiment of the invention is greatly ensured while the desensitization is ensured, and the strain range which can be borne by the material in the elastic range is +/-5000 mu epsilon.

As shown in fig. 4, a first threaded hole coinciding with the threaded hole of the three-ring desensitization substrate 101 is disposed on the sensor solder block 102, and the three-ring desensitization substrate 101 is fixed on the sensor solder block 102 by screws; a second threaded hole for fixing the temperature compensation sensing module 2 and a third threaded hole for fixing the fixing block of the optical fiber cable 5 are also formed; the first groove of the three-ring desensitization substrate 101 extends from the sensor welding block 102 and sequentially extends to a first sub-groove and a second sub-groove, wherein the exposed optical fiber is placed in the extending part of the first groove, the optical fiber loose tube is placed in the first sub-groove, and the armor tube is placed in the second sub-groove. In this way, the radial dimension of the second sub-groove is the same as the radial dimension of the sheathing tube. The problem that the material of the three-ring desensitization substrate 101 is particularly difficult to weld to the sensor welding block 102 is solved.

As shown in fig. 5, the fixing block 103 for the optical fiber cable 5 has a convex groove for placing the armor tube and threaded holes symmetrically arranged on two sides of the convex groove, wherein the threaded hole coincides with a third threaded hole on the sensor solder block 102, so that the sensor solder block 102 and the fixing block 103 for the optical fiber cable 5 are fixed by screws to press the armor tube, and the radius of the convex groove for placing the armor tube is the same as the radius of the armor tube.

As shown in fig. 6, the first threaded holes of the temperature compensation substrate 201 are symmetrically disposed on both sides of the second groove in the temperature compensation substrate 201, and the second threaded holes of the temperature compensation substrate 202 are overlapped, and the temperature compensation substrate 201 and the temperature compensation substrate 202 are fixed by screws. And a third threaded hole is formed in the outer side of the second threaded hole of the temperature compensation substrate 202 to be overlapped with the second threaded hole of the sensor welding block 102, and the temperature compensation substrate 202 and the sensor welding block 102 are fixed by screws. Here, the principle of the temperature compensation sensing module 2 is to eliminate the wavelength drift of the fiber grating caused by the temperature influence in the strain sensor, and therefore, the material of the temperature compensation substrate 201 is set to be the same as the material of the three-ring desensitization substrate 101 to ensure that the thermal expansion coefficients of the two are the same. Therefore, the error influence of the thermal temperature expansion mismatch result is mutually offset in calculation, and the accuracy of the measurement result can be ensured. Further, the temperature compensation substrate 201 is a cantilever beam structure fixed to the sensor pad 102 through the temperature compensation substrate 202, so that the temperature compensation substrate is not affected by external stress, and when the object to be measured is a curved surface or a vertical surface, the buffer design structure has the advantages of improving the gravity center position, reducing the influence of the gravity of the material, and being applicable to the external environment load. Meanwhile, the area of the whole fiber grating unidirectional strain sensor can be reduced, and the applicable space is increased.

As shown in fig. 7, fig. 7 is a schematic diagram of a bottom plate structure of a sensor according to an embodiment of the present invention. The sensor base plate 3 is composed of a sensor base plate welding frame 33 and an optical cable fixing block 31, the sensor base plate welding frame 33 is welded on the periphery of the strain sensor module 1, a groove is formed in the position, where an armored pipe of the fiber grating enters and exits, and a convex groove is formed in the optical cable fixing block 31, the groove and the convex groove are matched with each other, and the armored pipe of the grating optical cable is fixed. Threaded holes symmetrically arranged on two sides of a convex groove of the optical cable fixing block 31 are overlapped with threaded holes symmetrically arranged in a groove of the sensor base plate welding frame 33, the sensor base plate welding frame 33 and the optical cable fixing block 31 are fixed through the overlapped threaded holes by screws, and the aperture of the groove and the convex groove is consistent with that of an armored pipe of an optical fiber grating. Thus, the armored tube of the grating optical cable and the sensor base plate 3 can be firmly fixed together so as not to slide. A plurality of threaded holes for fixing the sensor protective shell 4 by screws are further arranged on the sensor bottom plate welding frame 33, so that the fiber bragg grating unidirectional strain sensor is prevented from being damaged by the outside.

Fig. 8 is a schematic structural view of a sensor protection shell according to an embodiment of the present invention, wherein a plurality of threaded holes for fixing with a sensor base plate 3 by screws are formed in the sensor protection shell structure 4, and a convex groove is formed at an access position of an armor tube of a fiber grating, and a pore diameter of the convex groove is consistent with a pore diameter of the armor tube of the fiber grating, so that the armor tube of the fiber grating can be accessed. The threaded holes may be provided at the frame edge of the sensor protection casing structure 4 and evenly distributed.

As can be seen from the above description, the fiber grating unidirectional strain sensor provided by the embodiment of the present invention includes the following advantages:

1) the size is small: the packaged size of the sensor is 79 x 38 x 29mm, and the small size means that the influence of the sensor on a monitored object is small, and the possibility of accidental damage of the sensor is small;

2) the measuring range is large: the strain range of the long-term working of the fiber bragg grating adopted by the fiber bragg grating strain sensor is +/-2000 mu epsilon, and the sensor provided by the invention has the advantages that the three-ring desensitization substrate 1 is arranged, so that the elastic modulus of the material is small, the yield stress is large, and the measuring range of the sensor can reach +/-5000 mu epsilon; the measuring range and the application range of the sensor are greatly improved;

3) the precision is high: by adopting the sensor provided by the invention, the three-ring desensitization substrate 11 is arranged, so that the desensitization coefficient is proper, and the precision of the sensor is improved;

4) temperature compensation: by adopting the sensor provided by the invention, the temperature compensation sensing module 2 is arranged to realize temperature compensation, so that the precision of engineering application is improved;

5) long-term stability and long life: because the three-ring desensitization substrate 11 in the sensor is connected with the sensor welding blocks by screws, the problems of long-term creep deformation and aging in the existing organic bonding mode do not exist, the sensor is stable and reliable in long-term work, and the service life is greatly prolonged;

6) the installation process is simple and the reliability is high: because the installation process adopts argon arc welding, the installation process is simple, complex treatment on the welding surface is not needed, and the installation problem caused by the surface treatment failure is also avoided.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.