Fiber grating temperature sensor

Abstract

The utility model discloses a fiber bragg grating temperature sensor which comprises an input fiber, a fiber coupler and output fibers, the input fiber is communicated with an input port of the fiber coupler, an output port of the fiber coupler is connected with a plurality of output fibers, the end portion of each output fiber is provided with a temperature sensor, and the temperature sensor comprises an upper shell and a lower shell. The upper shell and the lower shell are fixedly connected, a through hole is formed in one side of the joint of the upper shell and the lower shell, the output optical fiber is fixed in the through hole, a grating is arranged on the part, located in the temperature sensor, of the output optical fiber, pasting grooves are formed in the two sides of the bottom of the lower shell, fixing blocks are fixedly connected into the pasting grooves, and adhesive tape is pasted to the bottoms of the fixing blocks. By means of the arrangement, under the condition that firm fixing is guaranteed, fixing and dismounting are convenient during use and replacement.

Description

Technical Field

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

[0002] Temperature is one of the basic physical quantities given by the International System of Units. It is the main parameter that needs to be frequently measured and controlled in industrial and agricultural production and scientific experiments, and is also an important physical quantity closely related to people's daily life. At present, the more commonly used electrical temperature sensors are mainly thermocouple temperature sensors and thermistor temperature sensors.

[0003] In recent years, the application of fiber Bragg grating temperature sensors has become more and more extensive. Compared with traditional temperature sensors, fiber Bragg grating temperature sensors have many obvious advantages. First, they are miniaturized and the manufacturing process is simple. Second, they can be applied to many narrow spaces, such as wire harnesses, transformers and other occasions for temperature measurement.

[0004] When in use, the fiber Bragg grating temperature sensor needs to be fixed in the measured area. When the use is over or the fiber Bragg grating temperature sensor malfunctions, it needs to be removed, and then it can be used again and fixed again. At present, if the mechanical fixation is adopted for the fixation and disassembly of the fiber Bragg grating temperature sensor, it is very cumbersome. Summary of the Utility Model

[0005] Aiming at the above defects, the utility model provides a fiber Bragg grating temperature sensor, which can ensure convenient fixation and disassembly during use and replacement under the condition of firm fixation.

[0006] To achieve the above purpose, the utility model provides the following technical solutions: a fiber Bragg grating temperature sensor, including an input optical fiber, an optical fiber coupler, and an output optical fiber. The input optical fiber is connected to the input port of the optical fiber coupler. The output port of the optical fiber coupler is connected with a plurality of output optical fibers. The end of the output optical fiber is provided with a temperature sensor. The temperature sensor includes an upper shell and a lower shell. The upper shell is fixedly connected to the lower shell. One side of the connection between the upper shell and the lower shell is provided with a through hole. The output optical fiber is fixed inside the through hole. A grating is provided on the part of the output optical fiber located inside the temperature sensor. The bottom of the lower shell is provided with adhesive grooves on both sides. A fixing block is fixedly connected inside the adhesive groove. A tape is pasted on the bottom of the fixing block.

[0007] As a further improvement of the utility model, a buffer plate is fixedly connected to the top of the upper shell.

[0008] As a further improvement of the utility model, a ventilation port is provided on one side of the optical fiber coupler, and a cooling fan is provided at the ventilation port.

[0009] As a further improvement of the present utility model, a counterbore is provided at the end of the through hole, a fixing post is press-fitted in the counterbore, and one end of the fixing post is open and sleeved on the input optical fiber.

[0010] As a further improvement of the present utility model, an inverted trapezoidal fixing groove is opened above the adhesive groove, the upper part of the fixing block is engaged in the fixing groove, and the lower part of the fixing block is fitted in the adhesive groove.

[0011] As a further improvement of the present utility model, the bottom of the adhesive tape is flush with the bottom of the lower housing.

[0012] As a further improvement of the present utility model, the starting direction of the adhesive groove is the same as the direction of the through hole.

[0013] As a further improvement of the present utility model, the number of output optical fibers is 2n.

[0014] As a further improvement of the present utility model, the upper housing and the lower housing are fixedly connected by bolts fitted at the four corners.

[0015] Advantages of the present utility model:

[0016] 1. Adhesive grooves are opened on both sides at the bottom of the temperature sensor, and the adhesive tape is arranged in the adhesive grooves, which can ensure that the lower housing can be in direct contact with the detection location, ensuring the accuracy of temperature detection, and the installation and disassembly are very convenient by means of adhesive tape pasting.

[0017] 2. A fixing groove is opened at the top of the adhesive groove, the adhesive tape is pasted at the bottom of the fixing block, and the fixing block and the adhesive tape are fixed on the lower housing together by means of direct plug-in engagement. This installation method is more convenient, and the secondary fixing can be directly carried out in a short time by replacing the fixing block. Description of the drawings

[0018] Figure 1 is an axonometric view of the fiber Bragg grating temperature sensor of the present utility model;

[0019] Figure 2 is an axonometric schematic diagram of the temperature sensor;

[0020] Figure 3 is a schematic diagram of the internal structure of the temperature sensor.

[0021] In the figure: 1 - fiber coupler, 2 - heat dissipation fan, 3 - output optical fiber, 4 - temperature sensor, 401 - buffer plate, 402 - upper housing, 403 - lower housing, 404 - fixing post, 405 - adhesive tape, 406 - fixing block, 407 - lower accommodation groove, 408 - grating, 5 - input optical fiber. Specific embodiments

[0022] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific examples described herein are only used to explain the present utility model and are not used to limit the present utility model. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or rear, etc., are only with reference to the directions of the accompanying drawings. Therefore, the directional terms used are for illustration and not for limiting the present utility model. In addition, in all embodiments, the same reference numerals represent the same elements.

[0023] As Figure 1 shown, a fiber Bragg grating temperature sensor includes an input optical fiber 5, an optical fiber coupler 1, and an output optical fiber 3. One end of the optical fiber coupler 1 is provided with an input port and an output port. The optical fiber coupler 1 has only one input port, and the input port of the optical fiber coupler 1 is connected to one end of the input optical fiber 5, and the other end of the input optical fiber 5 is connected to a light source device. The optical fiber coupler 1 has a plurality of output ports, and the number of output ports is generally 2n. Each output port of the optical fiber coupler 1 is connected to one end of the output optical fiber 3, and the other end of the output optical fiber 3 is connected to the temperature sensor 4.

[0024] As a further illustration of this example, the light source device generates an optical signal that enters the optical fiber coupler 1 through the input optical fiber 5. The optical fiber coupler 1 distributes the optical signal proportionally to each output optical fiber 3 and then transports it to the temperature sensor 4. Setting the number of output ports to 2n is beneficial for flexible signal distribution, can improve the reliability and redundancy of the system, facilitate the equal division of the optical signal and optimize the signal quality, and is easy to manage and maintain.

[0025] One end of the optical fiber coupler 1 away from the input port is provided with a ventilation port, and a cooling fan 2 is provided at the ventilation port.

[0026] As a further illustration of this example, by providing the cooling fan 2, the operating temperature of the optical fiber coupler 1 can be reduced, the influence of the thermal effect on the optical signal can be reduced, and the stability and quality of the optical signal transmission can be maintained.

[0027] The temperature sensor 4 includes an upper housing 402 and a lower housing 403. Both the upper housing 402 and the lower housing 403 are square with the same size. The upper housing 402 is made of heat-insulating material to isolate the external temperature, while the lower housing 403 is in direct contact with the temperature-measuring object and is made of heat-conducting material. A buffer plate 401 (such as materials like EPE, EPU, EPS, etc.) is provided at the top of the upper housing 402. Threaded holes that match each other are provided at the four corners of both the upper housing 402 and the buffer plate 401. The upper housing 402 and the buffer plate 401 are fixedly connected to the lower housing 403 by bolts. A semi-circular upper accommodation groove is formed at the bottom of the upper housing 402, and a semi-circular lower accommodation groove 407 of the same shape is formed at the top of the lower housing 403. The upper accommodation groove and the lower accommodation groove 407 enclose a columnar through-hole, and a counterbore is provided at the end of the through-hole.

[0028] As a further explanation of this embodiment, the upper housing 402 of the temperature sensor 4 is generally exposed at the outer end and is more likely to be bumped than the lower housing 403, which may cause damage to the internal optical fiber and affect the detection. By setting the buffer plate 401, it can absorb and buffer the external force, playing a role in protecting the temperature sensor 4.

[0029] The input optical fiber 5 penetrates into the through-hole from one side of the counterbore. A fixing column 404 with an open end is provided on the part of the input optical fiber 5 located in the counterbore. The fixing column 404 is sleeved on the input optical fiber 5 and has an interference fit with the counterbore. When the fixing column 404 is inserted into the counterbore, the side of the fixing column 404 with the opening will contract inward, clamping and fixing the optical fiber, and at the same time fixing itself in the counterbore. A grating 408 is provided on the part of the input optical fiber 5 located inside the through-hole.

[0030] Rectangular pasting grooves are formed on both sides of the bottom of the lower housing 403, and the direction of the pasting grooves is the same as that of the through-hole. An inverted trapezoidal fixing groove is formed on the lower housing 403 above the pasting grooves. A fixing block 406 is fitted in the fixing groove. The upper part of the fixing block 406 is a fixing part, which is clamped in the fixing groove, and the lower part of the fixing block 406 is rectangular and fits in the upper part of the pasting groove. A double-sided adhesive tape 405 is pasted on the bottom of the fixing block 406. The adhesive tape 405 is made of polyimide material and can withstand a heat temperature of more than 200 °C. The bottom of the adhesive tape 405 is flush with the bottom of the lower housing 403.

[0031] As a further explanation of this embodiment, by setting the adhesive tape 405 in the pasting groove, the lower housing 403 can be fixed while being able to directly contact the object to be measured for heat conduction, making the measurement more accurate. The fixing block 406 is used to paste the adhesive tape 405, facilitating the fixing of the adhesive tape 405 at the bottom of the temperature sensor 4.

[0032] The working principle and usage process of the present utility model:

[0033] Tear off the release paper at the bottom of the tape 405, and then paste the temperature sensor 4 at the desired temperature measurement location through the tape 405. The bottom of the lower housing 403 is in direct contact with the measured object. The temperature at the temperature measurement location passes through the lower housing 403 of the temperature sensor 4 and is conducted to the grating 408. The grating 408 senses the temperature change and generates different optical signals. The information processor connected through the optical fiber coupler 1 displays the temperature at the temperature measurement location.

[0034] When the measurement is completed, the temperature sensor 4 can be directly torn off from the temperature measurement location. When using it again, only the tape 405 needs to be replaced to be used again. During the use process, when it is necessary to immediately change to another place for temperature measurement, the temperature sensor 4 can be directly torn off, then the fixing block 406 is pushed out from the fixing groove, and then the fixing block 406 with the tape 405 pasted on the bottom prepared in advance is snapped into the fixing groove, and then it can be re-pasted at the new measurement location for use. The whole process can be prepared in advance and is very convenient to replace.

[0035] The above is only the preferred implementation mode of the present utility model. The protection scope of the present utility model is not limited to the above implementation measures. All technical solutions falling within the idea of the present utility model belong to the protection scope of the present utility model. It should be pointed out that for those of ordinary skill in the art in this technical field, several improvements and refinements made without departing from the principle of the present utility model should also be regarded as the protection scope of the present utility model.

Claims

1. An optical fiber grating temperature sensor, characterized in that, It includes an input optical fiber (5), an optical fiber coupler (1), and an output optical fiber (3). The input optical fiber (5) is connected to the input port of the optical fiber coupler (1). The output port of the optical fiber coupler (1) is connected with a plurality of output optical fibers (3). A temperature sensor (4) is provided at the end of the output optical fiber (3). The temperature sensor (4) includes an upper housing (402) and a lower housing (403). The upper housing (402) is fixedly connected to the lower housing (403). A through hole is opened on one side of the connection between the upper housing (402) and the lower housing (403). The output optical fiber (3) is fixed inside the through hole. A grating (408) is provided on the part of the output optical fiber (3) located inside the temperature sensor (4). Adhesive grooves are opened on both sides of the bottom of the lower housing (403). A fixing block (406) is fixedly connected inside the adhesive groove. A tape (405) is pasted at the bottom of the fixing block (406).

2. The fiber Bragg grating temperature sensor according to claim 1, wherein A buffer plate (401) is fixedly connected to the top of the upper housing (402).

3. The fiber Bragg grating temperature sensor according to claim 1, wherein A ventilation opening is provided on one side of the optical fiber coupler (1), and a cooling fan (2) is provided at the ventilation opening.

4. The fiber Bragg grating temperature sensor according to claim 1, wherein A counterbore is provided at the end of the through hole. A fixing column (404) is in interference fit inside the counterbore. One end of the fixing column (404) is open and sleeved on the input optical fiber (5).

5. The fiber Bragg grating temperature sensor according to claim 1, wherein An inverted trapezoidal fixing groove is opened above the adhesive groove. The upper part of the fixing block (406) is clamped inside the fixing groove, and the lower part of the fixing block (406) is fitted inside the adhesive groove.

6. The fiber Bragg grating temperature sensor according to claim 1, wherein The bottom of the tape (405) is flush with the bottom of the lower housing (403).

7. The fiber grating temperature sensor according to claim 1, wherein The starting direction of the adhesive groove is the same as the direction of the through hole.

8. The fiber Bragg grating temperature sensor according to claim 1, wherein The number of the output optical fibers (3) is 2n.

9. The fiber Bragg grating temperature sensor according to claim 1, wherein The upper housing (402) and the lower housing (403) are fixedly connected by bolts fitted at the four corners.

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