High-temperature strain sensor

Abstract

The utility model discloses a high-temperature strain sensor, which comprises a sheet-type base body and an optical fiber groove, a high-temperature-resistant mechanism is arranged above the sheet-type base body, the high-temperature strain sensor relates to the technical field of sensors, an adhesive film substrate can be arranged on the sheet-type base body, the high-temperature strain sensor has better flexibility, moisture resistance and durability, and the use temperature can reach 100-300 DEG C. The thin paper is arranged on the adhesive film substrate, the upper moisture-proof layer and the lower moisture-proof layer are arranged at the two ends of the thin paper respectively, so that the moisture-proof durability and the use temperature of the thin paper can be improved, the time stability is good, then the glass fiber cloth is arranged above the upper moisture-proof layer, the glass fiber cloth can resist the high temperature of 400-450 DEG C, and the high temperature resistance can be further improved; and finally, the glass fiber cloth is coated with the adhesive layer, and the adhesive layer is covered with the release paper, so that the device can be conveniently adhered to a measured structural object during use, and meanwhile, the device is relatively easy to disassemble.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a high-temperature strain sensor. Background Art

[0002] A strain sensor is a sensor based on measuring the strain generated by the deformation of an object under force. The resistance strain gauge is its most commonly used sensing element. It is a sensing element that can convert the change of strain on a mechanical component into a change of resistance. The strain sensor used in a high temperature environment is called a high temperature strain sensor.

[0003] For example, a new chip-type high-temperature fiber Bragg grating strain sensor with publication number CN218673532U has a chip-type substrate that includes fiber grooves and fiber fastening holes. The optical fiber and the chip-type substrate are welded instead of adhesives, which reduces the influence of the chip-type substrate's own stress on the structure to be measured, effectively eliminates creep, and improves the long-term stability and reliability of the sensor.

[0004] This new chip-type high-temperature fiber Bragg grating strain sensor is formed by adding a high-temperature resistant fiber sheath to the optical fiber pigtail and welding the chip substrate to the structure to be measured by installing welding points. However, only the high-temperature resistant fiber sheath is added to the optical fiber pigtail, and no high-temperature resistant structure is set between the chip substrate and the structure to be measured. Since the high temperature mainly comes from the structure to be measured, the temperature in the grating area of ​​the chip substrate is high, which is not conducive to the subsequent strain sensor measurement, and thus the actual use effect is not good. In view of this, it is very necessary to design a high-temperature strain sensor to solve this problem. Utility Model Content

[0005] In response to the deficiencies in the prior art, the present invention provides a high-temperature strain sensor that solves the problem that the existing new chip-type high-temperature fiber Bragg grating strain sensor only adds a high-temperature resistant fiber sheath on the optical fiber pigtail without setting a high-temperature resistant structure between the chip-type substrate and the structure to be measured. Since the high temperature mainly comes from the structure to be measured, the temperature in the grating area of ​​the chip-type substrate is high, which is not conducive to the subsequent strain sensor measurement, and thus the actual use effect is not good.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a high-temperature strain sensor, including a sheet-type substrate and an optical fiber groove, the upper surface of the sheet-type substrate is processed with an arc-shaped optical fiber groove, the interior of the optical fiber groove is provided with an optical fiber connection section, and a high-temperature resistant mechanism is installed above the sheet-type substrate.

[0007] Preferably, the high temperature resistant mechanism includes a film base bonded to the upper surface of the sheet substrate, a thin paper is provided above the film base, and an upper moisture-resistant layer and a lower moisture-resistant layer are bonded to the upper and lower parts of the thin paper respectively, the lower surface of the lower moisture-resistant layer is bonded to the film base, and the upper surface of the upper moisture-resistant layer is bonded to glass fiber cloth.

[0008] Preferably, the upper surface of the glass fiber cloth is coated with an adhesive layer, and the upper surface of the adhesive layer is bonded with release paper.

[0009] Preferably, both left and right ends of the optical fiber connecting section are welded to the inner wall of the optical fiber groove of the sheet-type base through a plurality of welding points.

[0010] Preferably, the left end of the optical fiber connecting section is connected to an optical fiber pigtail.

[0011] Beneficial effects

[0012] The utility model provides a high-temperature strain sensor with the following beneficial effects:

[0013] An arc-shaped optical fiber groove can be processed on the top of the sheet substrate, and the optical fiber connecting section can be installed in this optical fiber groove by welding. An optical fiber pigtail is integrally set at the left end of the optical fiber connecting section to facilitate connection with external equipment. Then, a film base is set on the sheet substrate. The film base is a thin film made of organic adhesives such as epoxy resin, phenolic resin, polyester resin and polyimide. It has good flexibility, moisture resistance and durability, and the operating temperature can reach 100-300°C. Thin paper is set on the film base, and an upper moisture-resistant layer and a lower moisture-resistant layer are respectively provided at both ends of the thin paper. This can improve the moisture resistance and durability of the thin paper and the operating temperature, and has good time stability. Then, a glass fiber cloth is set on the upper moisture-resistant layer. The glass fiber cloth can withstand high temperatures of 400-450°C, which can further improve the high temperature resistance and is more conducive to the subsequent measurement of the strain sensor. Finally, an adhesive layer is coated on the glass fiber cloth and covered with release paper. This makes it convenient to bond the device to the structure to be measured when used, and it is also easier to disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the present utility model.

[0015] Figure 2 It is a partially enlarged schematic diagram of the present invention.

[0016] Figure 3 It is a partially enlarged schematic diagram of the present invention.

[0017] Figure 4 It is a partially enlarged schematic diagram of the present invention.

[0018] In the figure: 1. Sheet substrate; 2. Optical fiber groove; 3. Optical fiber connection section; 4. Welding point; 5. Optical fiber pigtail; 6. Film base; 7. Lower moisture-resistant layer; 8. Thin paper; 9. Upper moisture-resistant layer; 10. Glass fiber cloth; 11. Adhesive layer; 12. Release paper. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] See also Figure 1-4 The utility model provides a technical solution: a high-temperature strain sensor, comprising a sheet substrate 1 and an optical fiber groove 2, wherein the upper surface of the sheet substrate 1 is processed with an arc-shaped optical fiber groove 2, and an optical fiber connecting section 3 is provided inside the optical fiber groove 2, and a high-temperature resistant mechanism is installed above the sheet substrate 1;

[0021] An optical fiber groove 2 can be processed on the sheet substrate 1 so that the optical fiber connecting section 3 can be installed in the optical fiber groove 2, thereby facilitating subsequent strain sensor measurement.

[0022] This embodiment is further configured such that the high-temperature resistant mechanism includes a film base 6 bonded to the upper surface of the sheet-type base 1, a thin paper 8 is provided above the film base 6, and an upper moisture-resistant layer 9 and a lower moisture-resistant layer 7 are bonded to the upper and lower parts of the thin paper 8, respectively. The lower surface of the lower moisture-resistant layer 7 is bonded to the film base 6, and the upper surface of the upper moisture-resistant layer 9 is bonded to a glass fiber cloth 10.

[0023] The adhesive film base 6 is a thin film made of organic adhesives such as epoxy resin, phenolic resin, polyester resin and polyimide, which has good flexibility, moisture resistance and durability, and the operating temperature can reach 100-300°C. The upper moisture-resistant layer 9 and the lower moisture-resistant layer 7 are made of phenolic resin, which can increase the operating temperature of the thin paper 8 to 180°C, and improve the moisture resistance and operating temperature of the thin paper 8, and have good time stability. A glass fiber cloth 10 is arranged above the upper moisture-resistant layer 9. The glass fiber cloth 10 can withstand high temperatures of 400-450°C, which can further improve the high temperature resistance and is more conducive to the subsequent measurement of the strain sensor.

[0024] This embodiment is further configured such that the upper surface of the glass fiber cloth 10 is coated with an adhesive layer 11, and the upper surface of the adhesive layer 11 is bonded with a release paper 12;

[0025] An adhesive layer 11 is coated on the glass fiber cloth 10 and covered with a release paper 12, so that the device can be easily bonded to the structure to be measured during use and can also be easily disassembled.

[0026] This embodiment is further configured such that both left and right ends of the optical fiber connecting section 3 are welded to the inner wall of the optical fiber groove 2 of the sheet-type base 1 through a plurality of welding points 4;

[0027] This has a better fixing effect on the optical fiber connecting section 3.

[0028] This embodiment is further configured such that the left end of the optical fiber connecting section 3 is connected to an optical fiber pigtail 5;

[0029] The optical fiber pigtail 5 can be connected to an external device to form a strain sensor for signal transmission. As the structure being measured is deformed by force, the optical fiber connecting section 3 on the sheet substrate 1 also obtains the same deformation, causing its resistance to change accordingly. This resistance change is proportional to the strain of the structure being measured. Therefore, if this resistance change is converted into a voltage or current change through a certain measuring circuit, and then displayed and recorded using a display recording instrument, the size of the strain of the structure being measured can be known. This is existing technology and can be fully implemented by people in this field, so it will not be elaborated on.

[0030] By those skilled in the art, the components in this case are connected in sequence. The specific connection and operation sequence should refer to the following working principle. The detailed connection means are well-known technologies in this field. The following mainly introduces the working principle and process.

[0031] Embodiment: An arc-shaped optical fiber groove 2 can be processed on the top of the sheet substrate 1, and an optical fiber connecting section 3 can be installed in the optical fiber groove 2 by welding. An optical fiber pigtail 5 is integrally provided at the left end of the optical fiber connecting section 3 to facilitate connection with external equipment. Then, an adhesive film base 6 is provided on the sheet substrate 1. The adhesive film base 6 is a thin film made of an organic adhesive such as epoxy resin, phenolic resin, polyester resin and polyimide, which has good flexibility, moisture resistance and durability, and can be used at a temperature of 100-300°C. A thin paper 8 is provided on the adhesive film base 6, and An upper moisture-resistant layer 9 and a lower moisture-resistant layer 7 are respectively provided at both ends of the thin paper 8, which can improve the moisture resistance and durability of the thin paper 8 and the operating temperature, and has good time stability. Then, a glass fiber cloth 10 is provided above the upper moisture-resistant layer 9. The glass fiber cloth 10 can withstand high temperatures of 400-450°C, which can further improve the high-temperature resistance and is more conducive to the subsequent measurement of the strain sensor. Finally, an adhesive layer 11 is coated on the glass fiber cloth 10 and covered with a release paper 12. In this way, it is convenient to bond the device to the structure to be measured when in use, and it is also relatively easy to disassemble.

[0032] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include," "comprise," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations. The phrase "includes an element defined by..." does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.

[0033] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-temperature strain sensor comprising a sheet substrate (1) and an optical fiber groove (2), wherein the upper surface of the sheet substrate (1) is processed with an arc-shaped optical fiber groove (2), characterized in that: An optical fiber connection section (3) is provided inside the optical fiber groove (2), and a high-temperature resistant mechanism is installed above the sheet-type base (1).

2. A high temperature strain sensor according to claim 1, characterized in that: The high-temperature resistant structure comprises a film base (6) bonded to the upper surface of the sheet-type base (1), a thin paper (8) is provided above the film base (6), and an upper moisture-resistant layer (9) and a lower moisture-resistant layer (7) are bonded to the upper and lower parts of the thin paper (8), respectively, the lower surface of the lower moisture-resistant layer (7) is bonded to the film base (6), and the upper surface of the upper moisture-resistant layer (9) is bonded to a glass fiber cloth (10).

3. A high temperature strain sensor according to claim 2, characterized in that: The upper surface of the glass fiber cloth (10) is coated with an adhesive layer (11), and the upper surface of the adhesive layer (11) is bonded with a release paper (12).

4. The high temperature strain sensor according to claim 1, characterized in that: The left and right ends of the optical fiber connecting section (3) are welded to the inner wall of the optical fiber groove (2) of the sheet-type base (1) via a plurality of welding points (4).

5. The high temperature strain sensor according to claim 1, characterized in that: The left end of the optical fiber connecting section (3) is connected to an optical fiber pigtail (5).

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