CN216645249U

CN216645249U - High-stability fiber grating strain sensor

Info

Publication number: CN216645249U
Application number: CN202122207418.8U
Authority: CN
Inventors: 曹玲俊; 温作鹏; 黄明
Original assignee: Wuxi Zhitai Keyun Sensor Technology Co ltd
Current assignee: Wuxi Zhitai Keyun Sensor Technology Co ltd
Priority date: 2021-09-13
Filing date: 2021-09-13
Publication date: 2022-05-31
Anticipated expiration: 2031-09-13

Abstract

The utility model provides a high stability type fiber grating strain transducer, includes the sensor, two fixed plates of the inside symmetry fixedly connected with of sensor are equipped with sensitization elasticity fibre core between two fixed plates, and beneficial effect is: through using specific material and installing the temperature compensation grating additional, and then can play the drawback of avoiding appearing the temperature drift to influence the accuracy of data, and have the effect of protecting bare fiber, can dustproof and waterproof simultaneously, avoid only using in specific environment.

Description

High-stability fiber grating strain sensor

Technical Field

The utility model relates to the technical field of sensors, in particular to a high-stability fiber grating strain sensor.

Background

With the continuous development of science and technology, the technology of optical fiber sensors is also increasing in recent years, and optical fiber sensors are widely used in the industries of medicine, electric power and the like due to wide application prospects and good advantages.

But the sensor that has now is most comparatively sensitive to the temperature for the temperature floats great, thereby leads to data unstability, does not have the antidetonation simultaneously and prevents falling the effect, thereby makes the protection level not high, and then makes to have certain requirement to transportation environment, installation environment and service environment.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problems that the monitoring of data is inaccurate, and a better protection effect is not achieved, and provides a high-stability fiber grating strain sensor which can avoid the defect of temperature drift by using a specific material and additionally installing a temperature compensation grating so as to influence the accuracy of data, has the effect of protecting bare fibers, can prevent dust and water, and can be prevented from being used only in a specific environment.

The technical scheme adopted by the utility model for solving the technical problem is as follows: a high stability fiber grating strain sensor, comprising: the sensor, the inside symmetry fixedly connected with two fixed plates of sensor, two be equipped with sensitization elasticity fibre core between the fixed plate.

Preferably, the inside of the sensitization elastic fiber core is hollow, a bare fiber is arranged inside the sensitization elastic fiber core, a plurality of grooves are dug on one end face of the sensitization elastic fiber core opposite to the bare fiber, glue is added into the grooves, the sensitization elastic fiber core is fixedly connected with the bare fiber through the glue, and a temperature compensation grating is arranged on the bare fiber.

Preferably, the top and the bottom of the sensor are both fixedly connected with a stainless steel protective pipe, and a plurality of O-shaped sealing rings are connected between the sensor and the stainless steel protective pipe.

Preferably, the material of the sensitization elastic fiber core is an alloy material with an extremely low thermal expansion coefficient.

The utility model has the following advantages: through using specific material and installing the temperature compensation grating additional, and then can play the drawback of avoiding appearing the temperature drift to influence the accuracy of data, and have the effect of protecting bare fiber, can dustproof and waterproof simultaneously, avoid only using in specific environment.

Drawings

FIG. 1 is a schematic front view of a high-stability FBG strain sensor according to a preferred embodiment of the present invention;

FIG. 2 is an enlarged schematic view of a high-stability FBG strain sensor according to a preferred embodiment of the present invention at A;

fig. 3 is a schematic structural diagram of a groove of a sensitivity enhanced elastic fiber core of a high-stability fiber grating strain sensor according to a preferred embodiment of the utility model.

Description of reference numerals:

1. a sensor; 2. a stainless steel protective tube; 3. a bare optical fiber; 4. glue; 5. a fixing plate; 6. a sensitization elastic fiber core; 7. and an O-shaped sealing ring.

Detailed Description

The technical scheme of the utility model is clearly and completely described in the following with reference to the attached drawings. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.

The utility model will be further explained with reference to the drawings.

The sensor in the prior art does not have a good protection effect when monitoring data inaccurately.

Example one

The high-stability fiber grating strain sensor shown in fig. 1-3 comprises a sensor 1, two fixing plates 5 are symmetrically and fixedly connected inside the sensor 1, and a sensitivity enhancing elastic fiber core 6 is arranged between the two fixing plates 5.

The inside of the sensitization elastic fiber core 6 is hollow, the bare fiber 3 is arranged inside the sensitization elastic fiber core 6, a plurality of grooves are dug on one end face of the sensitization elastic fiber core 6 opposite to the bare fiber 3, glue is added into the grooves, the sensitization elastic fiber core 6 is fixedly connected with the bare fiber 3 through the glue, the bare fiber 3 is provided with the temperature compensation grating, and the temperature compensation grating is engraved on the bare fiber 3 through a specific method.

The top and the bottom of the sensor are fixedly connected with a stainless steel protective pipe 2, and a plurality of O-shaped sealing rings 7 are connected between the sensor 1 and the stainless steel protective pipe 2.

The material of the sensitization elastic fiber core 6 is an alloy material with extremely low thermal expansion coefficient.

Specifically, the sensitization elastic fiber core 6 is made of alloy materials with extremely low thermal expansion coefficient and is matched with a temperature compensation grating, the interference of temperature to the sensor 1 is fundamentally eliminated, meanwhile, the sensitization elastic fiber core 6 is integrally designed and is processed in a hollow mode, the bare optical fiber 3 penetrates through the middle of the sensitization elastic fiber core 6, the bare optical fiber 3 and the sensitization elastic fiber core 6 are bonded into a whole by glue, the gluing part is used for processing the sensitization elastic fiber core 6 by cutting grooves, so that the bonding surface of the glue and the fiber core is increased, the bonding force is further improved, the connection is more stable, the stainless steel protective tube 2 is additionally arranged on the outer wall of the sensor 1, further most of external force impact can be resisted, the stainless steel protective tube 2 is matched with the sensor 1 in a sealing mode by adopting an O-shaped sealing ring 7, the waterproof and dustproof effect is achieved, and dust entering into the interior of the sensor 1 is avoided, thereby affecting the effectiveness of the sensor 1.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.

Other parts of the utility model not described in detail are prior art and are not described in detail herein.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high stability fiber grating strain sensor, comprising: the sensor comprises a sensor (1), wherein two fixing plates (5) are symmetrically and fixedly connected to the inside of the sensor (1), and a sensitivity enhancing elastic fiber core (6) is arranged between the two fixing plates (5).

2. The strain sensor according to claim 1, wherein the inside of the sensitivity enhancing elastic fiber core (6) is hollow, the bare fiber (3) is disposed inside the sensitivity enhancing elastic fiber core (6), a plurality of grooves are drilled on an end surface of the sensitivity enhancing elastic fiber core (6) opposite to the bare fiber (3), glue is added into the grooves, the sensitivity enhancing elastic fiber core (6) is fixedly connected to the bare fiber (3) through the glue, and the bare fiber (3) is provided with the temperature compensation grating.

3. The strain sensor according to claim 1, wherein the top and bottom of the sensor are fixedly connected with stainless steel protection tubes (2), and a plurality of O-shaped sealing rings (7) are connected between the sensor (1) and the stainless steel protection tubes (2).

4. The high-stability fiber grating strain sensor according to claim 2, wherein the material of the sensitized elastic fiber core (6) is an alloy material with an extremely low thermal expansion coefficient.