CN216899219U - Plate type optical fiber vibration sensor - Google Patents
Plate type optical fiber vibration sensor Download PDFInfo
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- CN216899219U CN216899219U CN202220516974.5U CN202220516974U CN216899219U CN 216899219 U CN216899219 U CN 216899219U CN 202220516974 U CN202220516974 U CN 202220516974U CN 216899219 U CN216899219 U CN 216899219U
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Abstract
The plate-type optical fiber vibration sensor comprises sensing optical fibers and a carrier, wherein more than one involute-type optical fiber discs formed by coiling the sensing optical fibers are distributed on the same side of the carrier, the length of each optical fiber used by each optical fiber disc is more than or equal to 5m, the carrier is made of hard materials, the area of the carrier is larger than that of each optical fiber disc, and the optical fiber discs are bonded on the carrier. The utility model has the advantages of proper sensitivity to the vibration measurement of intermediate frequency and sensitive response to very low frequency to ultrahigh frequency signals.
Description
Technical Field
The utility model relates to the field of optical fiber detection vibration, in particular to a plate type optical fiber vibration sensor.
Background
The history of fibre-optic sensors dates back to the last 70 th century when people began to appreciate that optical fibres not only have light-transmitting properties, but also can themselves form a new basis for directly exchanging information, linking the quantity to be measured to the light guided within the fibre without any intermediate stage. Because the optical fiber sensor has incomparable advantages and wide development prospect compared with the conventional sensor, the research strength of the optical fiber sensor is increased in many countries without leaving much effort, and a plurality of research results are also emerged.
The optical fiber sensor is used as a novel sensor with obvious advantages, not only can be applied to the high, fine and sharp fields, but also can be rapidly popularized in the traditional industrial field, and products of the optical fiber sensor are continuously pushed to be new, so that the optical fiber sensor shows strong vitality. Fiber optic sensors have also been developed for a number of functions, such as detecting temperature, detecting humidity, detecting vibration, etc.; the existing vibration measuring optical fiber sensor mainly has the following forms, namely, a structure taking the whole optical fiber as a sensing element, a structure winding one optical fiber into a helical spring type structure and the like; the structure using the whole optical fiber as a sensing element has the problem of low sensitivity, and the structure using one optical fiber wound into a spiral spring type structure has the problems of too high sensitivity and too many false alarms; and both structures are insensitive to very low frequency or ultra high frequency signal responses. How to achieve proper vibration measurement sensitivity of the optical fiber sensor, which is not too low or too high, and sensitive to very low frequency to ultrahigh frequency signals is a problem to be solved urgently by technical personnel in the industry.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problems, the utility model provides a plate-type optical fiber vibration sensor which has appropriate vibration measuring sensitivity to the intermediate frequency and is sensitive to the very low frequency to the ultrahigh frequency signal response to the society.
The technical scheme of the utility model is as follows: the plate type optical fiber vibration sensor comprises sensing optical fibers and a carrier, wherein n involute optical fiber discs formed by coiling the sensing optical fibers are distributed on the same side of the carrier, n is an integer larger than or equal to 1, the length of each optical fiber used by each optical fiber disc is larger than or equal to 5m, the carrier is made of hard materials, the area of the carrier is larger than that of the optical fiber discs, and the optical fiber discs are adhered to the carrier.
As an improvement to the utility model, the thickness of the support is chosen between 0.01mm and 10 mm.
As an improvement to the present invention, the sensitivity of the carrier satisfies the formula
Wherein E is the Young's modulus,𝜌is the carrier density, S is the carrier area, and h is the carrier thickness.
As an improvement to the present invention, a first involute groove is provided on a surface of the carrier, and the optical fiber tray is stuck in the first involute groove.
As an improvement to the utility model, the support is a sheet of metal material.
As an improvement to the present invention, the sheet of metal material is a stainless steel sheet or an aluminum sheet.
As an improvement to the utility model, the support is a sheet of non-metallic material.
As an improvement to the utility model, the sheet of non-metallic material is a sheet of plastic or a rigid wood board.
As an improvement to the present invention, the total loss of all fiber optic disks is less than the predetermined loss detected by the photodetector.
Wherein the predetermined loss is 30 dB.
As an improvement of the utility model, an intermediate carrier is arranged between the optical fiber disc and the carrier, the intermediate carrier is adhered to the carrier, and the optical fiber disc is adhered to the intermediate carrier.
As an improvement to the present invention, a second involute groove is provided on a surface of the intermediate carrier, and the optical fiber tray is stuck in the second involute groove.
The utility model adopts the structure that more than one involute type optical fiber discs formed by coiling sensing optical fibers are distributed on the same side of the carrier, the length of each optical fiber used by each optical fiber disc is more than or equal to 5 meters, the carrier is made of hard materials, the area of the carrier is more than that of the optical fiber discs, and the optical fiber discs are bonded on the carrier, so that the optical fiber discs can detect signals, and the carrier can also receive vibration signals and transmit the vibration signals to the optical fiber discs for combined action, thereby having the advantages of proper sensitivity to the vibration measurement of intermediate frequency and sensitive response to very low frequency to ultrahigh frequency signals; the utility model can be applied to various energy signals which can cause vibration from very low frequency to ultrahigh frequency; the sensitivity of the sensing fiber is better than-150 dBre: 1V/mu Pa, and can detect micro-vibration signals above 0.1 Hz.
Drawings
Fig. 1 is a schematic perspective view of an embodiment of the present invention.
Fig. 2 is a schematic perspective view of a second embodiment of the present invention.
Fig. 3 is a schematic perspective view of the embodiment of fig. 2 after being arranged on a carrier.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
Referring to fig. 1, fig. 1 shows a first embodiment of a plate-type optical fiber vibration sensor, which includes a sensing optical fiber 1 and a carrier 2, wherein more than one involute-type optical fiber discs 11 formed by coiling the sensing optical fiber 1 are arranged on the same side of the carrier 2, the length of the optical fiber used by each optical fiber disc 11 is greater than or equal to 5 meters, the carrier 2 is made of a hard material, the area of the carrier 2 is greater than that of the optical fiber discs 11, and the optical fiber discs 11 are adhered to the carrier 2. The utility model adopts a structure that the sensing optical fiber 1 is tightly attached to the carrier 2, and the area of the carrier 2 is larger than that of the optical fiber disc 11, when certain vibration energy from the outside acts on the carrier 2, the carrier 2 can rapidly transmit the vibration signal to the optical fiber disc 11, and as the optical fiber discs 11 can be multiple, the information signals received by the optical fiber discs 11 are superposed and then transmitted to a background processor (not shown) through the adapter box 4; the plurality of optical fiber discs 11 can be connected in parallel or in series at the adapter box 4, when in parallel, the total signal is the superposition of each sub-signal, the optical loss of each optical fiber disc 11 is low, the optical fiber disc is suitable for large-scale cluster detection, and more hardware is needed, so that the cost is high; when the optical fiber discs are connected in series, signals are processed in one system, the optical fiber discs are convenient and quick to deploy and low in cost, and the number of the optical fiber discs 11 is limited in number due to total loss limitation. By adopting the structure of the utility model, the sensor with proper vibration measurement sensitivity can be obtained.
Preferably, the optical fibers in the involute optical fiber disk 11 formed by coiling the sensing optical fibers 1 are all preferably in the same plane, so that the vibration measurement sensitivity is improved, and the optical fiber disk is suitable for various energy signals which can cause vibration and are from very low frequency to ultrahigh frequency; the sensitivity of the sensing fiber is better than-150 dBre: 1V/mu Pa, and can detect micro-vibration signals above 0.1 Hz; the optical fibers are in the same plane, which means that after the optical fibers are wound into the optical fiber disc 11, the sensing optical fibers in the optical fiber disc 11 are in the same plane.
In order to ensure that the optical fiber discs 11 are in the same plane, a first involute type groove 21 is preferably arranged on the surface of the carrier 2, the optical fiber discs 11 are adhered in the first involute type groove 21, the cross section of the first involute type groove 21 can be circular or semicircular, and the diameter of the circle is slightly larger than that of the sensing optical fiber 1; when the cross section of the first involute groove 21 is circular, the sensing fiber 1 of the fiber tray 11 can be completely buried in the first involute groove 21; when the cross section of the first involute groove 21 is semicircular, a part of the sensing fiber 1 of the fiber tray 11 may be buried in the first involute groove 21, and the other part may protrude from the surface of the carrier 2.
The diameter of the sensing optical fiber 1 used by the optical fiber disc 11 also has influence on the vibration measurement sensitivity, the diameter of the sensing optical fiber 1 is preferably between 10um and 500um, and the bending radius of the sensing optical fiber 1 is more than or equal to 25 mm.
The length of the sensing fiber of each optical fiber tray 11 is greater than or equal to 5 meters, or the total length of all the optical fiber trays 11 connected in series is also greater than or equal to 5 meters, and the total length is not limited as long as the total loss of all the sensing fibers 1 is less than the predetermined light loss detected by the photodetector.
Wherein the predetermined optical loss is 30 dB.
That is, as long as the length of the sensing fiber 1 of the fiber reel 11 is greater than 5m, no matter how long, it is only required that the optical loss is less than 30dB, for example, the total length of the sensing fiber 1 is 1000m, and the loss is only 20dB, which is possible; if the total length of the sensing fiber 1 is 100m, the optical loss exceeds 30 dB. If 31dB is available, this is not possible.
The sensitivity of the carrier 2 was investigated𝜉Should satisfy the formula
Wherein E is the Young's modulus,𝜌is the carrier density, S is the carrier area, and h is the carrier thickness.
Among them, the larger the Young' S modulus E, the smaller the carrier density, the smaller the carrier area S and the carrier thickness h, and the better the sensitivity of the carrier 2.
The young's modulus in the present invention is a physical quantity used to describe the ability of a solid material to resist deformation. When a metal wire with the length of L and the sectional area of S is extended by delta L under the action of a force F, F/S is called stress, and the physical meaning of the F/S is the force applied to the unit sectional area of the metal wire; the physical meaning of the strain is the elongation corresponding to the unit length of the metal wire. The ratio of stress to strain is called the modulus of elasticity. Δ L is a slight variation. Young's modulus, also known as tensile modulus, is one of the elastic moduli or modules of elasticity. Young's modulus measures the stiffness (stiffness) of an isotropic elastomer, defined as the ratio between uniaxial stress and uniaxial deformation, within the range applicable to Hooke's Law. The term "elastic modulus" is used in an inclusive relationship, and includes, in addition to young's modulus, bulk modulus (bulk modulus), shear modulus (shear modulus), and the like.
Of course, in the present invention, in addition to considering the sensitivity of the carrier 2, the young' S modulus E, the carrier density, the carrier area S and the carrier thickness h are considered, and other characteristics of the selected material, such as the external force damage resistance, the sun exposure resistance and the like of the material, are also considered.
Considering these factors together, a stainless steel plate or an aluminum plate is preferable as the metal material plate. The non-metallic material plate is preferably a plastic plate, a hard wood plate, a carbon fiber plate or a glass fiber plate.
In the utility model, the thickness of the carrier 2 is selected from 0.01mm-10mm, if the carrier 2 is too thin, although the sensitivity of the utility model can be improved, the fracture resistance and the external force damage resistance are reduced; too thick a thickness of the carrier 2 may reduce the sensitivity of the present invention.
In this embodiment, four optical fiber discs 11 are arranged on the carrier 2, and the four optical fiber discs 11 share one adapter 4; in fact, the number of said optical fiber trays 11 can be chosen between 2 and 10 according to different needs.
Referring to fig. 2 and 3, fig. 2 and 3 show a second embodiment of a plate-type optical fiber vibration sensor, and the embodiment shown in fig. 2 and 3 has the same general structure as the embodiment shown in fig. 1, except that an intermediate carrier 3 is further disposed between the optical fiber tray 11 and the carrier 2, the intermediate carrier 3 is adhered to the carrier 2, and the optical fiber tray 11 is adhered to the intermediate carrier 3. The intermediate carrier 3 is required to be arranged, the production and processing are convenient, the optical fiber disc 11 can be firstly adhered to the intermediate carrier 3 during processing, and then the intermediate carrier 3 is adhered to the carrier 2, so that the production efficiency can be greatly improved. In the present invention, the intermediate carrier 3 may be circular or square.
The intermediate carrier 3 and the carrier 2 in the present invention may be made of the same material or different materials, which depends on different requirements.
The sensitivity of the intermediate carrier 3 was investigated𝜉Should satisfy the formula
Wherein E is the Young's modulus,𝜌is the carrier density, S is the carrier surfaceProduct, h is the thickness of the support.
Among them, the larger the Young' S modulus E, the smaller the carrier density, the smaller the carrier area S and the carrier thickness h, and the better the sensitivity of the intermediate carrier 3.
The young's modulus in the present invention is a physical quantity used to describe the ability of a solid material to resist deformation. When a metal wire with the length of L and the sectional area of S is extended by delta L under the action of a force F, F/S is called stress, and the physical meaning of the stress is the force applied to the unit sectional area of the metal wire; the physical meaning of the strain is the elongation corresponding to the unit length of the metal wire. The ratio of stress to strain is called the modulus of elasticity. Δ L is a slight variation. Young's modulus, also known as tensile modulus, is one of the elastic moduli or modules of elasticity. Young's modulus measures the stiffness (stiffness) of an isotropic elastomer, defined as the ratio between uniaxial stress and uniaxial deformation, within the range applicable to Hooke's Law. The term "elastic modulus" is used in an inclusive relationship, and includes, in addition to young's modulus, bulk modulus (bulk modulus), shear modulus (shear modulus), and the like.
Of course, in the present invention, in addition to considering the sensitivity of the intermediate carrier 3, the factors of young' S modulus E, carrier density, carrier area S and carrier thickness h are considered, and other characteristics of the selected material, such as external force damage resistance, sun exposure resistance and the like, are also considered.
Considering these factors together, a stainless steel plate or an aluminum plate is preferable as the metal material plate. The non-metallic material plate is preferably a plastic plate, a hard wood plate, a carbon fiber plate or a glass fiber plate.
In the present invention, the thickness of the intermediate carrier 3 is selected from 0.01mm to 10mm, and if the intermediate carrier 3 is too thin, although the sensitivity of the present invention can be improved, it is not convenient to attach the optical fiber tray 11; the thickness of the intermediate carrier 3 is too thick and will reduce the sensitivity of the utility model.
In order to ensure that the optical fiber discs 11 are in the same plane, it is preferable that a second involute groove 31 is formed on the surface of the intermediate carrier 3, the optical fiber discs 11 are adhered in the second involute groove 31, the cross section of the second involute groove 31 can be circular or semicircular, and the diameter of the circle is slightly larger than that of the sensing optical fiber 1; when the cross section of the second involute groove 31 is circular, the sensing fiber 1 of the fiber tray 11 can be completely buried in the second involute groove 31; when the cross section of the second involute groove 31 is semicircular, a part of the sensing fiber 1 of the fiber tray 11 may be embedded in the second involute groove 31, and another part may protrude from the surface of the intermediate carrier 3.
All equivalent changes made by the contents of the specification and the drawings of the utility model are included in the scope of the claims of the utility model without departing from the idea of the utility model.
Claims (10)
1. A plate-type optical fiber vibration sensor comprises a sensing optical fiber (1), and is characterized in that: the sensor optical fiber disc is characterized by further comprising a carrier (2), wherein n involute-type optical fiber discs formed by coiling sensing optical fibers are arranged on the same side of the carrier (2), n is an integer larger than or equal to 1, the length of each optical fiber used by the optical fiber disc (11) is larger than or equal to 5m, the carrier (2) is made of hard materials, the area of the carrier (2) is larger than that of the optical fiber disc (11), and the optical fiber discs (11) are bonded on the carrier (2).
2. The plate-type optical fiber vibration sensor according to claim 1, wherein: the thickness of the carrier (2) is selected between 0.01mm and 10 mm.
3. The plate-type optical fiber vibration sensor according to claim 1 or 2, wherein: the sensitivity of the carrier (2) satisfies the formula
Wherein E is the Young's modulus,𝜌is the carrier density, S is the carrier area, and h is the carrier thickness.
4. The plate-type optical fiber vibration sensor according to claim 1 or 2, wherein: a first involute groove (21) is formed in the surface of the carrier (2), and the optical fiber disc (11) is stuck in the first involute groove (21).
5. The plate-type optical fiber vibration sensor according to claim 1 or 2, wherein: the carrier (2) is a sheet of metal material.
6. The plate-type optical fiber vibration sensor according to claim 5, wherein: the metal material plate is a stainless steel plate or an aluminum plate.
7. The plate-type optical fiber vibration sensor according to claim 1 or 2, wherein: the carrier (2) is a sheet of non-metallic material.
8. The plate-type optical fiber vibration sensor according to claim 7, wherein: the non-metallic material plate is a plastic plate, a hard wood plate, a carbon fiber plate or glass fiber.
9. The plate-type optical fiber vibration sensor according to claim 1 or 2, wherein: an intermediate carrier (3) is further arranged between the optical fiber disc (11) and the carrier (2), the intermediate carrier (3) is bonded to the carrier (2), and the optical fiber disc (11) is bonded to the intermediate carrier (3).
10. The plate-type optical fiber vibration sensor according to claim 9, wherein: a second involute groove (31) is formed in the surface of the intermediate carrier (3), and the optical fiber disc (11) is stuck in the second involute groove (31).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220516974.5U CN216899219U (en) | 2022-03-11 | 2022-03-11 | Plate type optical fiber vibration sensor |
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| CN202220516974.5U CN216899219U (en) | 2022-03-11 | 2022-03-11 | Plate type optical fiber vibration sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114646380A (en) * | 2022-03-11 | 2022-06-21 | 深圳市光熠信息科技有限公司 | Plate type optical fiber vibration sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114646380A (en) * | 2022-03-11 | 2022-06-21 | 深圳市光熠信息科技有限公司 | Plate type optical fiber vibration sensor |
| CN114646380B (en) * | 2022-03-11 | 2024-02-23 | 深圳市光熠信息科技有限公司 | Plate-type optical fiber vibration sensor |
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